diff --git a/gcc/gcc/config/rs6000/macos.h b/gcc/gcc/config/rs6000/macos.h
index 771d53739e..a4c9ccf2b2 100644
--- a/gcc/gcc/config/rs6000/macos.h
+++ b/gcc/gcc/config/rs6000/macos.h
@@ -69,7 +69,7 @@
 /* Profiled library versions are used by linking with special directories.  */
 #define LIB_SPEC "-lc"
 
-#define LIBGCC_SPEC "-lretrocrt -lgcc -lInterfaceLib"
+#define LIBGCC_SPEC "-lretrocrt -lgcc %{carbon: -lCarbonLib} %{!carbon: -lInterfaceLib}"
 
 /* Static linking with shared libstdc++ requires libsupc++ as well.  */
 #define LIBSTDCXX_STATIC "supc++"
diff --git a/gcc/gcc/config/rs6000/rs6000.opt b/gcc/gcc/config/rs6000/rs6000.opt
index 79d01d4965..a6d3045a6a 100644
--- a/gcc/gcc/config/rs6000/rs6000.opt
+++ b/gcc/gcc/config/rs6000/rs6000.opt
@@ -600,3 +600,6 @@ Allow float/double variables in upper registers if cpu allows it
 moptimize-swaps
 Target Undocumented Var(rs6000_optimize_swaps) Init(1) Save
 Analyze and remove doubleword swaps from VSX computations.
+
+carbon
+Target RejectNegative
\ No newline at end of file