Index: run_tests
--- run_tests.orig
+++ run_tests
@@ -4,7 +4,7 @@ for t in tests/test*; do
     echo $t
     file_type=$(file -b $t)
     case ${file_type} in
-        *[Pp]ython*) python ${t} ;;
+        *[Pp]ython*) ${MODPY_BIN} ${t} ;;
         *Bourne*) bash ${t} ;;
         *bash*)   bash ${t} ;;
         *perl*)   perl ${t} ;;