jjb: Fix babeltrace builds without cc

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>

diff --git a/scripts/babeltrace/build.sh b/scripts/babeltrace/build.sh
index cf4906393e0647be73938abc88c236a4aabd167e..58991010e7fd707c74950f89a0e9a90f0e4837c6 100755 (executable)
--- a/scripts/babeltrace/build.sh
+++ b/scripts/babeltrace/build.sh
@@ -144,7 +144,7 @@ clang-7)
     ;;
 esac
 
-if [ "x$CC" != "x" ]; then
+if [ "x${CC:-}" != "x" ]; then
     echo "Selected compiler:"
     "$CC" -v
 fi