diff --git a/build_clang.sh b/build_clang.sh
index a58d8aa..bfff2d6 100755
--- a/build_clang.sh
+++ b/build_clang.sh
@@ -10,6 +10,8 @@ source tools/tools.sh
 TARBALL_DIR=$BASE_DIR/tarballs
 BUILD_DIR=$BASE_DIR/build
 
+mkdir -p $BUILD_DIR
+
 if [ -z "$SKIP_GCC_CHECK" ]; then
 if [ $PLATFORM != "Darwin" -a $PLATFORM != "FreeBSD" ]; then
   set +e