diff --git a/build.gradle b/build.gradle
index 433b39a..323256b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1939,6 +1939,10 @@
         systemProperty 'slow_tests', project.property('slow_tests')
     }
 
+
+    if (project.hasProperty('desugar_jdk_json_dir')) {
+        systemProperty 'desugar_jdk_json_dir', project.property('desugar_jdk_json_dir')
+    }
     if (project.hasProperty('desugar_jdk_libs')) {
         systemProperty 'desugar_jdk_libs', project.property('desugar_jdk_libs')
     }
diff --git a/src/library_desugar/desugar_jdk_libs_alternative_3.json b/src/library_desugar/desugar_jdk_libs_alternative_3.json
index e23a9b8..2b0ffd9 100644
--- a/src/library_desugar/desugar_jdk_libs_alternative_3.json
+++ b/src/library_desugar/desugar_jdk_libs_alternative_3.json
@@ -77,12 +77,6 @@
         "java.time.": "j$.time.",
         "java.util.Desugar": "j$.util.Desugar"
       },
-      "backport": {
-        "java.lang.Double8": "java.lang.Double",
-        "java.lang.Integer8": "java.lang.Integer",
-        "java.lang.Long8": "java.lang.Long",
-        "java.lang.Math8": "java.lang.Math"
-      },
       "retarget_lib_member": {
         "java.util.Date#toInstant": "java.util.DesugarDate",
         "java.util.GregorianCalendar#toZonedDateTime": "java.util.DesugarGregorianCalendar",
diff --git a/src/library_desugar/jdk11/desugar_jdk_libs.json b/src/library_desugar/jdk11/desugar_jdk_libs.json
new file mode 100644
index 0000000..b0c751c
--- /dev/null
+++ b/src/library_desugar/jdk11/desugar_jdk_libs.json
@@ -0,0 +1,257 @@
+{
+  "configuration_format_version": 3,
+  "group_id" : "com.tools.android",
+  "artifact_id" : "desugar_jdk_libs",
+  "version": "2.0.0",
+  "required_compilation_api_level": 26,
+  "synthesized_library_classes_package_prefix": "j$.",
+  "support_all_callbacks_from_library": true,
+  "common_flags": [
+    {
+      "api_level_below_or_equal": 25,
+      "wrapper_conversion": [
+        "java.time.Clock"
+      ]
+    },
+    {
+      "api_level_below_or_equal": 23,
+      "wrapper_conversion": [
+        "java.util.PrimitiveIterator$OfDouble",
+        "java.util.PrimitiveIterator$OfInt",
+        "java.util.PrimitiveIterator$OfLong",
+        "java.util.Spliterator",
+        "java.util.Spliterator$OfDouble",
+        "java.util.Spliterator$OfInt",
+        "java.util.Spliterator$OfLong",
+        "java.util.Spliterator$OfPrimitive",
+        "java.util.function.BiConsumer",
+        "java.util.function.BiFunction",
+        "java.util.function.BiPredicate",
+        "java.util.function.BinaryOperator",
+        "java.util.function.Consumer",
+        "java.util.function.DoubleBinaryOperator",
+        "java.util.function.DoubleConsumer",
+        "java.util.function.DoubleFunction",
+        "java.util.function.DoublePredicate",
+        "java.util.function.DoubleToIntFunction",
+        "java.util.function.DoubleToLongFunction",
+        "java.util.function.DoubleUnaryOperator",
+        "java.util.function.Function",
+        "java.util.function.IntBinaryOperator",
+        "java.util.function.IntConsumer",
+        "java.util.function.IntFunction",
+        "java.util.function.IntPredicate",
+        "java.util.function.IntToDoubleFunction",
+        "java.util.function.IntToLongFunction",
+        "java.util.function.IntUnaryOperator",
+        "java.util.function.LongBinaryOperator",
+        "java.util.function.LongConsumer",
+        "java.util.function.LongFunction",
+        "java.util.function.LongPredicate",
+        "java.util.function.LongToDoubleFunction",
+        "java.util.function.LongToIntFunction",
+        "java.util.function.LongUnaryOperator",
+        "java.util.function.ObjDoubleConsumer",
+        "java.util.function.ObjIntConsumer",
+        "java.util.function.ObjLongConsumer",
+        "java.util.function.Predicate",
+        "java.util.function.Supplier",
+        "java.util.function.ToDoubleFunction",
+        "java.util.function.ToIntFunction",
+        "java.util.function.ToLongFunction",
+        "java.util.function.UnaryOperator",
+        "java.util.stream.BaseStream",
+        "java.util.stream.Collector",
+        "java.util.stream.DoubleStream",
+        "java.util.stream.IntStream",
+        "java.util.stream.LongStream",
+        "java.util.stream.Stream"
+      ]
+    }
+  ],
+  "library_flags": [
+    {
+      "api_level_below_or_equal": 25,
+      "rewrite_prefix": {
+        "j$.time.": "java.time.",
+        "java.time.": "j$.time.",
+        "java.util.Desugar": "j$.util.Desugar",
+        "sun.misc.Desugar": "j$.sun.misc.Desugar",
+        "jdk.internal.util.Preconditions": "j$.jdk.internal.util.Preconditions"
+      },
+      "retarget_lib_member": {
+        "java.util.Date#toInstant": "java.util.DesugarDate",
+        "java.util.GregorianCalendar#toZonedDateTime": "java.util.DesugarGregorianCalendar",
+        "java.util.TimeZone#toZoneId": "java.util.DesugarTimeZone"
+      },
+      "custom_conversion": {
+        "java.time.ZonedDateTime": "java.time.TimeConversions",
+        "java.time.LocalDate": "java.time.TimeConversions",
+        "java.time.Duration": "java.time.TimeConversions",
+        "java.time.ZoneId": "java.time.TimeConversions",
+        "java.time.MonthDay": "java.time.TimeConversions",
+        "java.time.Instant": "java.time.TimeConversions"
+      }
+    },
+    {
+      "api_level_below_or_equal": 23,
+      "rewrite_prefix": {
+        "j$.util.Optional": "java.util.Optional",
+        "j$.util.LongSummaryStatistics": "java.util.LongSummaryStatistics",
+        "j$.util.IntSummaryStatistics": "java.util.IntSummaryStatistics",
+        "j$.util.DoubleSummaryStatistics": "java.util.DoubleSummaryStatistics",
+        "java.util.stream.": "j$.util.stream.",
+        "java.util.function.": "j$.util.function.",
+        "java.util.Comparators": "j$.util.Comparators",
+        "java.util.DoubleSummaryStatistics": "j$.util.DoubleSummaryStatistics",
+        "java.util.IntSummaryStatistics": "j$.util.IntSummaryStatistics",
+        "java.util.LongSummaryStatistics": "j$.util.LongSummaryStatistics",
+        "java.util.Objects": "j$.util.Objects",
+        "java.util.Optional": "j$.util.Optional",
+        "java.util.PrimitiveIterator": "j$.util.PrimitiveIterator",
+        "java.util.SortedSet$1": "j$.util.SortedSet$1",
+        "java.util.Spliterator": "j$.util.Spliterator",
+        "java.util.StringJoiner": "j$.util.StringJoiner",
+        "java.util.Tripwire": "j$.util.Tripwire",
+        "java.util.concurrent.Helpers": "j$.util.concurrent.Helpers",
+        "java.util.concurrent.ThreadLocalRandom": "j$.util.concurrent.ThreadLocalRandom",
+        "java.util.concurrent.atomic.DesugarAtomic": "j$.util.concurrent.atomic.DesugarAtomic",
+        "java.util.concurrent.ConcurrentHashMap": "j$.util.concurrent.ConcurrentHashMap",
+        "java.util.AbstractList": "j$.util.AbstractList",
+        "java.util.CollSer": "j$.util.CollSer",
+        "java.util.ImmutableCollections": "j$.util.ImmutableCollections",
+        "java.util.KeyValueHolder": "j$.util.KeyValueHolder"
+      },
+      "retarget_lib_member": {
+        "java.util.Arrays#stream": "java.util.DesugarArrays",
+        "java.util.Arrays#spliterator": "java.util.DesugarArrays",
+        "java.util.LinkedHashSet#spliterator": "java.util.DesugarLinkedHashSet"
+      },
+      "dont_rewrite": [
+        "java.util.Iterator#remove"
+      ],
+      "emulate_interface": {
+        "java.lang.Iterable": "j$.lang.Iterable",
+        "java.util.Map$Entry": "j$.util.Map$Entry",
+        "java.util.Collection": "j$.util.Collection",
+        "java.util.Map": "j$.util.Map",
+        "java.util.Iterator": "j$.util.Iterator",
+        "java.util.Comparator": "j$.util.Comparator",
+        "java.util.List": "j$.util.List",
+        "java.util.SortedSet": "j$.util.SortedSet",
+        "java.util.Set": "j$.util.Set",
+        "java.util.concurrent.ConcurrentMap": "j$.util.concurrent.ConcurrentMap"
+      },
+      "custom_conversion": {
+        "java.util.Optional": "java.util.OptionalConversions",
+        "java.util.OptionalDouble": "java.util.OptionalConversions",
+        "java.util.OptionalInt": "java.util.OptionalConversions",
+        "java.util.OptionalLong": "java.util.OptionalConversions",
+        "java.util.LongSummaryStatistics": "java.util.LongSummaryStatisticsConversions",
+        "java.util.IntSummaryStatistics": "java.util.IntSummaryStatisticsConversions",
+        "java.util.DoubleSummaryStatistics": "java.util.DoubleSummaryStatisticsConversions"
+      }
+    }
+  ],
+  "program_flags": [
+    {
+      "api_level_below_or_equal": 25,
+      "rewrite_prefix": {
+        "java.time.": "j$.time.",
+        "java.util.Desugar": "j$.util.Desugar"
+      },
+      "retarget_lib_member": {
+        "java.util.Calendar#toInstant": "java.util.DesugarCalendar",
+        "java.util.Date#from": "java.util.DesugarDate",
+        "java.util.Date#toInstant": "java.util.DesugarDate",
+        "java.util.GregorianCalendar#from": "java.util.DesugarGregorianCalendar",
+        "java.util.GregorianCalendar#toZonedDateTime": "java.util.DesugarGregorianCalendar",
+        "java.util.TimeZone#getTimeZone": "java.util.DesugarTimeZone",
+        "java.util.TimeZone#toZoneId": "java.util.DesugarTimeZone"
+      },
+      "custom_conversion": {
+        "java.time.ZonedDateTime": "java.time.TimeConversions",
+        "java.time.LocalDate": "java.time.TimeConversions",
+        "java.time.Duration": "java.time.TimeConversions",
+        "java.time.ZoneId": "java.time.TimeConversions",
+        "java.time.MonthDay": "java.time.TimeConversions",
+        "java.time.Instant": "java.time.TimeConversions"
+      }
+    },
+    {
+      "api_level_below_or_equal": 23,
+      "rewrite_prefix": {
+        "java.util.stream.": "j$.util.stream.",
+        "java.util.function.": "j$.util.function.",
+        "java.util.DoubleSummaryStatistics": "j$.util.DoubleSummaryStatistics",
+        "java.util.IntSummaryStatistics": "j$.util.IntSummaryStatistics",
+        "java.util.LongSummaryStatistics": "j$.util.LongSummaryStatistics",
+        "java.util.Optional": "j$.util.Optional",
+        "java.util.PrimitiveIterator": "j$.util.PrimitiveIterator",
+        "java.util.Spliterator": "j$.util.Spliterator",
+        "java.util.StringJoiner": "j$.util.StringJoiner",
+        "java.util.concurrent.ThreadLocalRandom": "j$.util.concurrent.ThreadLocalRandom",
+        "java.util.concurrent.atomic.DesugarAtomic": "j$.util.concurrent.atomic.DesugarAtomic",
+        "java.util.concurrent.ConcurrentHashMap": "j$.util.concurrent.ConcurrentHashMap"
+      },
+      "retarget_lib_member": {
+        "java.util.Arrays#stream": "java.util.DesugarArrays",
+        "java.util.Arrays#spliterator": "java.util.DesugarArrays",
+        "java.util.LinkedHashSet#spliterator": "java.util.DesugarLinkedHashSet",
+        "java.util.concurrent.atomic.AtomicInteger#getAndUpdate": "java.util.concurrent.atomic.DesugarAtomicInteger",
+        "java.util.concurrent.atomic.AtomicInteger#updateAndGet": "java.util.concurrent.atomic.DesugarAtomicInteger",
+        "java.util.concurrent.atomic.AtomicInteger#getAndAccumulate": "java.util.concurrent.atomic.DesugarAtomicInteger",
+        "java.util.concurrent.atomic.AtomicInteger#accumulateAndGet": "java.util.concurrent.atomic.DesugarAtomicInteger",
+        "java.util.concurrent.atomic.AtomicLong#getAndUpdate": "java.util.concurrent.atomic.DesugarAtomicLong",
+        "java.util.concurrent.atomic.AtomicLong#updateAndGet": "java.util.concurrent.atomic.DesugarAtomicLong",
+        "java.util.concurrent.atomic.AtomicLong#getAndAccumulate": "java.util.concurrent.atomic.DesugarAtomicLong",
+        "java.util.concurrent.atomic.AtomicLong#accumulateAndGet": "java.util.concurrent.atomic.DesugarAtomicLong",
+        "java.util.concurrent.atomic.AtomicReference#getAndUpdate": "java.util.concurrent.atomic.DesugarAtomicReference",
+        "java.util.concurrent.atomic.AtomicReference#updateAndGet": "java.util.concurrent.atomic.DesugarAtomicReference",
+        "java.util.concurrent.atomic.AtomicReference#getAndAccumulate": "java.util.concurrent.atomic.DesugarAtomicReference",
+        "java.util.concurrent.atomic.AtomicReference#accumulateAndGet": "java.util.concurrent.atomic.DesugarAtomicReference",
+        "java.util.Collections#synchronizedMap": "java.util.DesugarCollections",
+        "java.util.Collections#synchronizedSortedMap": "java.util.DesugarCollections"
+      },
+      "dont_rewrite": [
+        "java.util.Iterator#remove"
+      ],
+      "emulate_interface": {
+        "java.lang.Iterable": "j$.lang.Iterable",
+        "java.util.Map$Entry": "j$.util.Map$Entry",
+        "java.util.Collection": "j$.util.Collection",
+        "java.util.Map": "j$.util.Map",
+        "java.util.Iterator": "j$.util.Iterator",
+        "java.util.Comparator": "j$.util.Comparator",
+        "java.util.List": "j$.util.List",
+        "java.util.SortedSet": "j$.util.SortedSet",
+        "java.util.Set": "j$.util.Set",
+        "java.util.concurrent.ConcurrentMap": "j$.util.concurrent.ConcurrentMap"
+      },
+      "custom_conversion": {
+        "java.util.Optional": "java.util.OptionalConversions",
+        "java.util.OptionalDouble": "java.util.OptionalConversions",
+        "java.util.OptionalInt": "java.util.OptionalConversions",
+        "java.util.OptionalLong": "java.util.OptionalConversions",
+        "java.util.LongSummaryStatistics": "java.util.LongSummaryStatisticsConversions",
+        "java.util.IntSummaryStatistics": "java.util.IntSummaryStatisticsConversions",
+        "java.util.DoubleSummaryStatistics": "java.util.DoubleSummaryStatisticsConversions"
+      }
+    }
+  ],
+  "shrinker_config": [
+    "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap$TreeBin { int lockState; }",
+    "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap { int sizeCtl; int transferIndex; long baseCount; int cellsBusy; }",
+    "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap { private void readObject(java.io.ObjectInputStream); private void writeObject(java.io.ObjectOutputStream); private void readObjectNoData(); private static final java.io.ObjectStreamField[] serialPersistentFields; private static final long serialVersionUID;}",
+    "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap$CounterCell { long value; }",
+    "-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); public static final !synthetic <fields>; }",
+    "-keeppackagenames j$.**",
+    "-keepclassmembers class j$.util.IntSummaryStatistics { long count; long sum; int min; int max; }",
+    "-keepclassmembers class j$.util.LongSummaryStatistics { long count; long sum; long min; long max; }",
+    "-keepclassmembers class j$.util.DoubleSummaryStatistics { long count; double sum; double min; double max; }",
+    "-keepattributes Signature",
+    "-keepattributes EnclosingMethod",
+    "-keepattributes InnerClasses",
+    "-dontwarn sun.misc.Unsafe"
+  ]
+}
diff --git a/src/library_desugar/jdk11/desugar_jdk_libs_alternative_3.json b/src/library_desugar/jdk11/desugar_jdk_libs_alternative_3.json
new file mode 100644
index 0000000..66f3500
--- /dev/null
+++ b/src/library_desugar/jdk11/desugar_jdk_libs_alternative_3.json
@@ -0,0 +1,260 @@
+{
+  "configuration_format_version": 3,
+  "group_id" : "com.tools.android",
+  "artifact_id" : "desugar_jdk_libs_alternative_3",
+  "version": "2.0.0",
+  "required_compilation_api_level": 26,
+  "synthesized_library_classes_package_prefix": "j$.",
+  "support_all_callbacks_from_library": false,
+  "common_flags": [
+    {
+      "api_level_below_or_equal": 25,
+      "wrapper_conversion": [
+        "java.time.Clock"
+      ]
+    },
+    {
+      "api_level_below_or_equal": 23,
+      "wrapper_conversion": [
+        "java.util.PrimitiveIterator$OfDouble",
+        "java.util.PrimitiveIterator$OfInt",
+        "java.util.PrimitiveIterator$OfLong",
+        "java.util.Spliterator",
+        "java.util.Spliterator$OfDouble",
+        "java.util.Spliterator$OfInt",
+        "java.util.Spliterator$OfLong",
+        "java.util.Spliterator$OfPrimitive",
+        "java.util.function.BiConsumer",
+        "java.util.function.BiFunction",
+        "java.util.function.BiPredicate",
+        "java.util.function.BinaryOperator",
+        "java.util.function.Consumer",
+        "java.util.function.DoubleBinaryOperator",
+        "java.util.function.DoubleConsumer",
+        "java.util.function.DoubleFunction",
+        "java.util.function.DoublePredicate",
+        "java.util.function.DoubleToIntFunction",
+        "java.util.function.DoubleToLongFunction",
+        "java.util.function.DoubleUnaryOperator",
+        "java.util.function.Function",
+        "java.util.function.IntBinaryOperator",
+        "java.util.function.IntConsumer",
+        "java.util.function.IntFunction",
+        "java.util.function.IntPredicate",
+        "java.util.function.IntToDoubleFunction",
+        "java.util.function.IntToLongFunction",
+        "java.util.function.IntUnaryOperator",
+        "java.util.function.LongBinaryOperator",
+        "java.util.function.LongConsumer",
+        "java.util.function.LongFunction",
+        "java.util.function.LongPredicate",
+        "java.util.function.LongToDoubleFunction",
+        "java.util.function.LongToIntFunction",
+        "java.util.function.LongUnaryOperator",
+        "java.util.function.ObjDoubleConsumer",
+        "java.util.function.ObjIntConsumer",
+        "java.util.function.ObjLongConsumer",
+        "java.util.function.Predicate",
+        "java.util.function.Supplier",
+        "java.util.function.ToDoubleFunction",
+        "java.util.function.ToIntFunction",
+        "java.util.function.ToLongFunction",
+        "java.util.function.UnaryOperator",
+        "java.util.stream.BaseStream",
+        "java.util.stream.Collector",
+        "java.util.stream.DoubleStream",
+        "java.util.stream.IntStream",
+        "java.util.stream.LongStream",
+        "java.util.stream.Stream"
+      ]
+    }
+  ],
+  "library_flags": [
+    {
+      "api_level_below_or_equal": 25,
+      "rewrite_prefix": {
+        "j$.time.": "java.time.",
+        "java.time.": "j$.time.",
+        "java.util.Desugar": "j$.util.Desugar",
+        "sun.misc.Desugar": "j$.sun.misc.Desugar",
+        "jdk.internal.util.Preconditions": "j$.jdk.internal.util.Preconditions"
+      },
+      "retarget_lib_member": {
+        "java.util.Date#toInstant": "java.util.DesugarDate",
+        "java.util.GregorianCalendar#toZonedDateTime": "java.util.DesugarGregorianCalendar",
+        "java.util.TimeZone#toZoneId": "java.util.DesugarTimeZone"
+      },
+      "custom_conversion": {
+        "java.time.ZonedDateTime": "java.time.TimeConversions",
+        "java.time.LocalDate": "java.time.TimeConversions",
+        "java.time.Duration": "java.time.TimeConversions",
+        "java.time.ZoneId": "java.time.TimeConversions",
+        "java.time.MonthDay": "java.time.TimeConversions",
+        "java.time.Instant": "java.time.TimeConversions"
+      }
+    },
+    {
+      "api_level_below_or_equal": 23,
+      "rewrite_prefix": {
+        "j$.util.Optional": "java.util.Optional",
+        "j$.util.LongSummaryStatistics": "java.util.LongSummaryStatistics",
+        "j$.util.IntSummaryStatistics": "java.util.IntSummaryStatistics",
+        "j$.util.DoubleSummaryStatistics": "java.util.DoubleSummaryStatistics",
+        "java.util.stream.": "j$.util.stream.",
+        "java.util.function.": "j$.util.function.",
+        "java.util.Comparators": "j$.util.Comparators",
+        "java.util.DoubleSummaryStatistics": "j$.util.DoubleSummaryStatistics",
+        "java.util.IntSummaryStatistics": "j$.util.IntSummaryStatistics",
+        "java.util.LongSummaryStatistics": "j$.util.LongSummaryStatistics",
+        "java.util.Objects": "j$.util.Objects",
+        "java.util.Optional": "j$.util.Optional",
+        "java.util.PrimitiveIterator": "j$.util.PrimitiveIterator",
+        "java.util.SortedSet$1": "j$.util.SortedSet$1",
+        "java.util.Spliterator": "j$.util.Spliterator",
+        "java.util.StringJoiner": "j$.util.StringJoiner",
+        "java.util.Tripwire": "j$.util.Tripwire",
+        "java.util.concurrent.Helpers": "j$.util.concurrent.Helpers",
+        "java.util.concurrent.ThreadLocalRandom": "j$.util.concurrent.ThreadLocalRandom",
+        "java.util.concurrent.atomic.DesugarAtomic": "j$.util.concurrent.atomic.DesugarAtomic",
+        "java.util.concurrent.ConcurrentHashMap": "j$.util.concurrent.ConcurrentHashMap",
+        "java.util.AbstractList": "j$.util.AbstractList",
+        "java.util.CollSer": "j$.util.CollSer",
+        "java.util.ImmutableCollections": "j$.util.ImmutableCollections",
+        "java.util.KeyValueHolder": "j$.util.KeyValueHolder",
+        "java.io.DesugarBufferedReader": "j$.io.DesugarBufferedReader",
+        "java.io.UncheckedIOException": "j$.io.UncheckedIOException"
+      },
+      "retarget_lib_member": {
+        "java.util.Arrays#stream": "java.util.DesugarArrays",
+        "java.util.Arrays#spliterator": "java.util.DesugarArrays",
+        "java.util.LinkedHashSet#spliterator": "java.util.DesugarLinkedHashSet",
+        "java.io.BufferedReader#lines": "java.io.DesugarBufferedReader"
+      },
+      "dont_rewrite": [
+        "java.util.Iterator#remove"
+      ],
+      "emulate_interface": {
+        "java.util.Map$Entry": "j$.util.Map$Entry",
+        "java.util.Collection": "j$.util.Collection",
+        "java.util.Map": "j$.util.Map",
+        "java.util.Iterator": "j$.util.Iterator",
+        "java.util.Comparator": "j$.util.Comparator",
+        "java.util.List": "j$.util.List",
+        "java.util.SortedSet": "j$.util.SortedSet",
+        "java.util.Set": "j$.util.Set",
+        "java.util.concurrent.ConcurrentMap": "j$.util.concurrent.ConcurrentMap"
+      },
+      "custom_conversion": {
+        "java.util.Optional": "java.util.OptionalConversions",
+        "java.util.OptionalDouble": "java.util.OptionalConversions",
+        "java.util.OptionalInt": "java.util.OptionalConversions",
+        "java.util.OptionalLong": "java.util.OptionalConversions",
+        "java.util.LongSummaryStatistics": "java.util.LongSummaryStatisticsConversions",
+        "java.util.IntSummaryStatistics": "java.util.IntSummaryStatisticsConversions",
+        "java.util.DoubleSummaryStatistics": "java.util.DoubleSummaryStatisticsConversions"
+      }
+    }
+  ],
+  "program_flags": [
+    {
+      "api_level_below_or_equal": 25,
+      "rewrite_prefix": {
+        "java.time.": "j$.time.",
+        "java.util.Desugar": "j$.util.Desugar"
+      },
+      "retarget_lib_member": {
+        "java.util.Calendar#toInstant": "java.util.DesugarCalendar",
+        "java.util.Date#from": "java.util.DesugarDate",
+        "java.util.Date#toInstant": "java.util.DesugarDate",
+        "java.util.GregorianCalendar#from": "java.util.DesugarGregorianCalendar",
+        "java.util.GregorianCalendar#toZonedDateTime": "java.util.DesugarGregorianCalendar",
+        "java.util.TimeZone#getTimeZone": "java.util.DesugarTimeZone",
+        "java.util.TimeZone#toZoneId": "java.util.DesugarTimeZone"
+      },
+      "custom_conversion": {
+        "java.time.ZonedDateTime": "java.time.TimeConversions",
+        "java.time.LocalDate": "java.time.TimeConversions",
+        "java.time.Duration": "java.time.TimeConversions",
+        "java.time.ZoneId": "java.time.TimeConversions",
+        "java.time.MonthDay": "java.time.TimeConversions",
+        "java.time.Instant": "java.time.TimeConversions"
+      }
+    },
+    {
+      "api_level_below_or_equal": 23,
+      "rewrite_prefix": {
+        "java.util.stream.": "j$.util.stream.",
+        "java.util.function.": "j$.util.function.",
+        "java.util.DoubleSummaryStatistics": "j$.util.DoubleSummaryStatistics",
+        "java.util.IntSummaryStatistics": "j$.util.IntSummaryStatistics",
+        "java.util.LongSummaryStatistics": "j$.util.LongSummaryStatistics",
+        "java.util.Objects": "j$.util.Objects",
+        "java.util.Optional": "j$.util.Optional",
+        "java.util.PrimitiveIterator": "j$.util.PrimitiveIterator",
+        "java.util.Spliterator": "j$.util.Spliterator",
+        "java.util.StringJoiner": "j$.util.StringJoiner",
+        "java.util.concurrent.ThreadLocalRandom": "j$.util.concurrent.ThreadLocalRandom",
+        "java.util.concurrent.atomic.DesugarAtomic": "j$.util.concurrent.atomic.DesugarAtomic",
+        "java.util.concurrent.ConcurrentHashMap": "j$.util.concurrent.ConcurrentHashMap",
+        "java.io.UncheckedIOException": "j$.io.UncheckedIOException"
+      },
+      "retarget_lib_member": {
+        "java.util.Arrays#stream": "java.util.DesugarArrays",
+        "java.util.Arrays#spliterator": "java.util.DesugarArrays",
+        "java.util.LinkedHashSet#spliterator": "java.util.DesugarLinkedHashSet",
+        "java.util.concurrent.atomic.AtomicInteger#getAndUpdate": "java.util.concurrent.atomic.DesugarAtomicInteger",
+        "java.util.concurrent.atomic.AtomicInteger#updateAndGet": "java.util.concurrent.atomic.DesugarAtomicInteger",
+        "java.util.concurrent.atomic.AtomicInteger#getAndAccumulate": "java.util.concurrent.atomic.DesugarAtomicInteger",
+        "java.util.concurrent.atomic.AtomicInteger#accumulateAndGet": "java.util.concurrent.atomic.DesugarAtomicInteger",
+        "java.util.concurrent.atomic.AtomicLong#getAndUpdate": "java.util.concurrent.atomic.DesugarAtomicLong",
+        "java.util.concurrent.atomic.AtomicLong#updateAndGet": "java.util.concurrent.atomic.DesugarAtomicLong",
+        "java.util.concurrent.atomic.AtomicLong#getAndAccumulate": "java.util.concurrent.atomic.DesugarAtomicLong",
+        "java.util.concurrent.atomic.AtomicLong#accumulateAndGet": "java.util.concurrent.atomic.DesugarAtomicLong",
+        "java.util.concurrent.atomic.AtomicReference#getAndUpdate": "java.util.concurrent.atomic.DesugarAtomicReference",
+        "java.util.concurrent.atomic.AtomicReference#updateAndGet": "java.util.concurrent.atomic.DesugarAtomicReference",
+        "java.util.concurrent.atomic.AtomicReference#getAndAccumulate": "java.util.concurrent.atomic.DesugarAtomicReference",
+        "java.util.concurrent.atomic.AtomicReference#accumulateAndGet": "java.util.concurrent.atomic.DesugarAtomicReference",
+        "java.util.Collections#synchronizedMap": "java.util.DesugarCollections",
+        "java.util.Collections#synchronizedSortedMap": "java.util.DesugarCollections",
+        "java.io.BufferedReader#lines": "java.io.DesugarBufferedReader"
+      },
+      "dont_rewrite": [
+        "java.util.Iterator#remove"
+      ],
+      "emulate_interface": {
+        "java.util.Map$Entry": "j$.util.Map$Entry",
+        "java.util.Collection": "j$.util.Collection",
+        "java.util.Map": "j$.util.Map",
+        "java.util.Iterator": "j$.util.Iterator",
+        "java.util.Comparator": "j$.util.Comparator",
+        "java.util.List": "j$.util.List",
+        "java.util.SortedSet": "j$.util.SortedSet",
+        "java.util.Set": "j$.util.Set",
+        "java.util.concurrent.ConcurrentMap": "j$.util.concurrent.ConcurrentMap"
+      },
+      "custom_conversion": {
+        "java.util.Optional": "java.util.OptionalConversions",
+        "java.util.OptionalDouble": "java.util.OptionalConversions",
+        "java.util.OptionalInt": "java.util.OptionalConversions",
+        "java.util.OptionalLong": "java.util.OptionalConversions",
+        "java.util.LongSummaryStatistics": "java.util.LongSummaryStatisticsConversions",
+        "java.util.IntSummaryStatistics": "java.util.IntSummaryStatisticsConversions",
+        "java.util.DoubleSummaryStatistics": "java.util.DoubleSummaryStatisticsConversions"
+      }
+    }
+  ],
+  "shrinker_config": [
+    "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap$TreeBin { int lockState; }",
+    "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap { int sizeCtl; int transferIndex; long baseCount; int cellsBusy; }",
+    "-keepclassmembers class j$.util.concurrent.ConcurrentHashMap$CounterCell { long value; }",
+    "-keepclassmembers enum * { public static **[] values(); public static ** valueOf(java.lang.String); public static final !synthetic <fields>; }",
+    "-keeppackagenames j$",
+    "-keepclassmembers class j$.util.IntSummaryStatistics { long count; long sum; int min; int max; }",
+    "-keepclassmembers class j$.util.LongSummaryStatistics { long count; long sum; long min; long max; }",
+    "-keepclassmembers class j$.util.DoubleSummaryStatistics { long count; double sum; double min; double max; }",
+    "-keepattributes Signature",
+    "-keepattributes EnclosingMethod",
+    "-keepattributes InnerClasses",
+    "-dontwarn sun.misc.Unsafe"
+  ]
+}
diff --git a/src/test/java/com/android/tools/r8/ToolHelper.java b/src/test/java/com/android/tools/r8/ToolHelper.java
index 544938a..9d0e9b5 100644
--- a/src/test/java/com/android/tools/r8/ToolHelper.java
+++ b/src/test/java/com/android/tools/r8/ToolHelper.java
@@ -180,10 +180,12 @@
 
   public static final Path DESUGAR_LIB_CONVERSIONS =
       Paths.get(LIBS_DIR, "library_desugar_conversions.zip");
+  public static final String DESUGAR_LIB_JSON_DIR =
+      System.getProperty("desugar_jdk_json_dir", "src/library_desugar");
   public static final Path DESUGAR_LIB_JSON_FOR_TESTING =
-      Paths.get("src/library_desugar/desugar_jdk_libs.json");
+      Paths.get(DESUGAR_LIB_JSON_DIR, "desugar_jdk_libs.json");
   public static final Path DESUGAR_LIB_JSON_FOR_TESTING_ALTERNATIVE_3 =
-      Paths.get("src/library_desugar/desugar_jdk_libs_alternative_3.json");
+      Paths.get(DESUGAR_LIB_JSON_DIR, "desugar_jdk_libs_alternative_3.json");
 
   public static boolean isLocalDevelopment() {
     return System.getProperty("local_development", "0").equals("1");
diff --git a/tools/archive_desugar_jdk_libs.py b/tools/archive_desugar_jdk_libs.py
index 403212f..825cb91 100755
--- a/tools/archive_desugar_jdk_libs.py
+++ b/tools/archive_desugar_jdk_libs.py
@@ -85,10 +85,12 @@
     'https://github.com/'
         + github_account + '/' + LIBRARY_NAME, checkout_dir)
 
-def BuildDesugaredLibrary(checkout_dir):
+def BuildDesugaredLibrary(checkout_dir, variant):
+  if (variant != 'jdk8' and variant != 'jdk11'):
+    raise Exception('Variant ' + variant + 'is not supported')
   with utils.ChangedWorkingDirectory(checkout_dir):
     bazel = os.path.join(utils.BAZEL_TOOL, 'lib', 'bazel', 'bin', 'bazel')
-    cmd = [bazel, 'build', 'maven_release']
+    cmd = [bazel, 'build', 'maven_release' + ('_jdk11' if variant == 'jdk11' else '')]
     utils.PrintCmd(cmd)
     subprocess.check_call(cmd)
     cmd = [bazel, 'shutdown']
@@ -97,9 +99,16 @@
 
     # Locate the library jar and the maven zip with the jar from the
     # bazel build.
-    library_jar = os.path.join(
-        checkout_dir, 'bazel-bin', 'src', 'share', 'classes', 'java', 'libjava.jar')
-    maven_zip = os.path.join(checkout_dir, 'bazel-bin', LIBRARY_NAME +'.zip')
+    if variant == 'jdk8':
+      library_jar = os.path.join(
+          checkout_dir, 'bazel-bin', 'src', 'share', 'classes', 'java', 'libjava.jar')
+    else:
+      library_jar = os.path.join(
+          checkout_dir, 'bazel-bin', 'jdk11', 'src', 'java_base_selected.jar')
+    maven_zip = os.path.join(
+      checkout_dir,
+      'bazel-bin',
+      LIBRARY_NAME + ('_jdk11' if variant != 'jdk11' else '') +'.zip')
     return (library_jar, maven_zip)
 
 
@@ -124,11 +133,12 @@
   # Make sure bazel is extracted in third_party.
   utils.DownloadFromGoogleCloudStorage(utils.BAZEL_SHA_FILE)
   utils.DownloadFromGoogleCloudStorage(utils.JAVA8_SHA_FILE)
+  utils.DownloadFromGoogleCloudStorage(utils.JAVA11_SHA_FILE)
 
   if options.build_only:
     with utils.TempDir() as checkout_dir:
       CloneDesugaredLibrary(options.github_account, checkout_dir)
-      (library_jar, maven_zip) = BuildDesugaredLibrary(checkout_dir)
+      (library_jar, maven_zip) = BuildDesugaredLibrary(checkout_dir, "jdk8")
       shutil.copyfile(
         library_jar,
         os.path.join(options.build_only, os.path.basename(library_jar)))
@@ -150,7 +160,7 @@
       raise Exception(
           'Target archive directory %s already exists' % destination)
 
-    (library_jar, maven_zip) = BuildDesugaredLibrary(checkout_dir)
+    (library_jar, maven_zip) = BuildDesugaredLibrary(checkout_dir, "jdk8")
 
     storage_path = LIBRARY_NAME + '/' + version
     # Upload the jar file with the library.
diff --git a/tools/test.py b/tools/test.py
index 9e2a3e2..f7b204f 100755
--- a/tools/test.py
+++ b/tools/test.py
@@ -162,6 +162,8 @@
       help='Enable Java debug agent and suspend compilation (default disabled)',
       default=False,
       action='store_true')
+  result.add_option('--desugared-library-configuration', '--desugared_library-configuration',
+      help='Use alternative desugared library configuration.')
   result.add_option('--desugared-library', '--desugared_library',
       help='Build and use desugared library from GitHub.')
   return result.parse_args()
@@ -181,6 +183,13 @@
   if utils.is_bot():
     gradle.RunGradle(['--no-daemon', 'clean'])
 
+  desugar_jdk_json_dir = None
+  if options.desugared_library_configuration:
+    if options.desugared_library_configuration != 'jdk11':
+      print("Only value supported for --desugared-library is 'jdk11'")
+      exit(1)
+    desugar_jdk_json_dir = 'src/library_desugar/jdk11'
+
   desugar_jdk_libs = None
   if options.desugared_library:
     if options.desugared_library != 'HEAD':
@@ -195,12 +204,12 @@
       # Make sure bazel is extracted in third_party.
       utils.DownloadFromGoogleCloudStorage(utils.BAZEL_SHA_FILE)
       utils.DownloadFromGoogleCloudStorage(utils.JAVA8_SHA_FILE)
-      (library_jar, maven_zip) = archive_desugar_jdk_libs.BuildDesugaredLibrary(checkout_dir)
+      utils.DownloadFromGoogleCloudStorage(utils.JAVA11_SHA_FILE)
+      (library_jar, maven_zip) = archive_desugar_jdk_libs.BuildDesugaredLibrary(checkout_dir, 'jdk11' if options.desugared_library_configuration == 'jdk11' else 'jdk8')
       desugar_jdk_libs = os.path.join(desugar_jdk_libs_dir, os.path.basename(library_jar))
       shutil.copyfile(library_jar, desugar_jdk_libs)
       print('Desugared library for test in ' + desugar_jdk_libs)
 
-
   gradle_args = ['--stacktrace']
   if utils.is_bot():
     # Bots don't like dangling processes.
@@ -284,6 +293,8 @@
     gradle_args.append('--no-daemon')
   if options.debug_agent:
     gradle_args.append('--no-daemon')
+  if desugar_jdk_json_dir:
+    gradle_args.append('-Pdesugar_jdk_json_dir=' + desugar_jdk_json_dir)
   if desugar_jdk_libs:
     gradle_args.append('-Pdesugar_jdk_libs=' + desugar_jdk_libs)
 
diff --git a/tools/utils.py b/tools/utils.py
index 1820991..da4a0e4 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -83,6 +83,7 @@
 BAZEL_SHA_FILE = os.path.join(THIRD_PARTY, 'bazel.tar.gz.sha1')
 BAZEL_TOOL = os.path.join(THIRD_PARTY, 'bazel')
 JAVA8_SHA_FILE = os.path.join(THIRD_PARTY, 'openjdk', 'jdk8', 'linux-x86.tar.gz.sha1')
+JAVA11_SHA_FILE = os.path.join(THIRD_PARTY, 'openjdk', 'jdk-11', 'linux.tar.gz.sha1')
 IGNORE_WARNINGS_RULES = os.path.join(REPO_ROOT, 'src', 'test', 'ignorewarnings.rules')
 
 ANDROID_HOME_ENVIROMENT_NAME = "ANDROID_HOME"