diff --git a/configure b/configure
index 866d095e2e74a9..4bae197df3a021 100755
--- a/configure
+++ b/configure
@@ -576,11 +576,11 @@ def get_version_helper(cc, regexp):
 
 def get_llvm_version(cc):
   return get_version_helper(
-      cc, r"(^clang version|based on LLVM) ([3-9]\.[0-9]+)")
+    cc, r"(^(?:FreeBSD )?clang version|based on LLVM) ([3-9]\.[0-9]+)")
 
 def get_xcode_version(cc):
   return get_version_helper(
-      cc, r"(^Apple LLVM version) ([5-9]\.[0-9]+)")
+    cc, r"(^Apple LLVM version) ([5-9]\.[0-9]+)")
 
 def get_gas_version(cc):
   try: