--- a/common/autoconf/libraries.m4	Wed Jul 05 21:49:00 2017 +0200
+++ b/common/autoconf/libraries.m4	Tue Jun 07 15:42:20 2016 +0200
@@ -122,7 +122,7 @@
         fi
       fi
     done
-    llvm_version=$("${LLVM_CONFIG}" --version | sed 's/\.//; s/svn.*//')
+    llvm_version=$("${LLVM_CONFIG}" --version | $SED 's/\.//; s/svn.*//')
     LLVM_CFLAGS="${LLVM_CFLAGS} -DSHARK_LLVM_VERSION=${llvm_version}"
 
     unset LLVM_LDFLAGS