Index: lib/clang/clang.build.mk
--- lib/clang/clang.build.mk	2011-10-20 05:42:19.000000000 -0700
+++ lib/clang/clang.build.mk	2011-10-20 05:42:54.000000000 -0700
@@ -6,6 +6,7 @@
 	-I${LLVM_SRCS}/${SRCDIR} ${INCDIR:C/^/-I${LLVM_SRCS}\//} -I. \
 	-I${LLVM_SRCS}/../../lib/clang/include \
 	-DLLVM_ON_UNIX -DLLVM_ON_FREEBSD \
+	-frandom-seed=RepeatabilityConsideredGood \
 	-D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS #-DNDEBUG
 
 # Correct for gcc miscompilation when compiling on PPC with -O2