include ../../build/library.make
-LIB_MCS_FLAGS += -r:$(corlib) -r:System.Core.dll -r:System.dll
+LIB_REFS += System.Core System
+LIB_MCS_FLAGS += -r:$(corlib) -d:CONCURRENT_COLLECTIONS
-TEST_MCS_FLAGS = -r:System.Core.dll
+TEST_MCS_FLAGS = -r:System.Core.dll -r:System.dll
+
+EXTRA_DISTFILES=README.md