--- a/scripts/jpeg-version.sh
+++ b/scripts/jpeg-version.sh
@@ -1,2 +1,2 @@
 #!/bin/sh
-echo JPEG_LIB_VERSION | cpp $CFLAGS -include jpeglib.h | tail -1
+echo JPEG_LIB_VERSION | $CPP $CFLAGS -include jpeglib.h - | tail -1