diff --git a/bootstrap b/bootstrap
index 1fb6698c26..9dff3df98e 100755
--- a/bootstrap
+++ b/bootstrap
@@ -537,10 +537,10 @@ fi
 TMPFILE=`cmake_tmp_file`
 cat > "${TMPFILE}.c" <<EOF
 #include<stdio.h>
-int main()
+int main(int argc, char* argv[])
 {
-  printf("1\n");
-  return 0;
+  printf("%d\n", (argv != 0));
+  return argc-1;
 }
 EOF
 for a in ${cmake_c_compilers}; do