diff --git a/01_ENV/build-c.sh b/01_ENV/build-c.sh
index 88ed7a4..64f79e1 100755
--- a/01_ENV/build-c.sh
+++ b/01_ENV/build-c.sh
@@ -1,4 +1,4 @@
 #!/usr/bin/env bash
 bash clean.sh
-clang-6.0 -c func1.c main.c -lm
-clang-6.0 -s func1.o main.o
+clang-6.0 -c func1.c main.c -v
+clang-6.0 -s func1.o main.o -v