diff -r dec00ae64ca8 configure
--- a/configure Thu Sep 29 19:43:01 2011 +0200
+++ b/configure Thu Sep 29 21:54:14 2011 +0200
@@ -5412,10 +5412,11 @@
            WRAP="-fwrapv"
         fi

-        # Clang also needs -fwrapv
-        if test "$CC" = "clang" ; then
-            WRAP="-fwrapv"
-        fi
+        # Clang and llvm-gcc also need -fwrapv
+        case "$CC" in
+        clang|llvm-gcc)
+            WRAP="-fwrapv";;
+        esac

        case $ac_cv_prog_cc_g in
        yes)
diff -r dec00ae64ca8 configure.in
--- a/configure.in      Thu Sep 29 19:43:01 2011 +0200
+++ b/configure.in      Thu Sep 29 21:54:14 2011 +0200
@@ -933,10 +933,11 @@
            WRAP="-fwrapv"
         fi

-        # Clang also needs -fwrapv
-        if test "$CC" = "clang" ; then
-            WRAP="-fwrapv"
-        fi
+        # Clang and llvm-gcc also need -fwrapv
+        case "$CC" in
+        clang|llvm-gcc)
+            WRAP="-fwrapv";;
+        esac

        case $ac_cv_prog_cc_g in
        yes)