diff --git a/scripts/simplebuild.sh b/scripts/simplebuild.sh
index f92b047b50..e609bd8308 100755
--- a/scripts/simplebuild.sh
+++ b/scripts/simplebuild.sh
@@ -7,7 +7,11 @@ fi
 
 pushd ext-src/cppunit
 ./autogen.sh
-./configure --prefix=../../externals/cppunit
+CWD=$(pwd)
+if [ -f Makefile ]; then
+  make distclean
+fi
+./configure LD=clang LDFLAGS="-stdlib=libc++" CXX=clang++ CC=clang CXXFLAGS="-stdlib=libc++" --prefix=$CWD/../../externals/cppunit
 make
 make install