diff --git a/Makefile b/Makefile
index 6a162f3..552818f 100644
--- a/Makefile
+++ b/Makefile
@@ -5,13 +5,14 @@
 #############################################
 
 OPT = -Wall -g -DDEBUG_LEVEL=1 -DMUST_ABORT
+CC = gcc
 
 bubulles.o:	bubulles.c bubulles.h Makefile
-	clang $(OPT) -c $< 
+	$(CC) $(OPT) -c $< 
 
-#
+# --- build some tests and tools
 
 tbb:		tbb.c bubulles.h bubulles.o Makefile
-	clang $(OPT)  $< bubulles.o -o tbb
+	$(CC) $(OPT)  $< bubulles.o -o tbb
 
 #############################################
diff --git a/tbb.c b/tbb.c
index 9fee20c..bda1c8e 100644
--- a/tbb.c
+++ b/tbb.c
@@ -116,7 +116,7 @@ int		foo;
 
 printf("*** Bubulles Testing -- %s %s\n\n", __DATE__, __TIME__);
 
-bubulles_version(0);
+bubulles_version(1);
 
 test_alloc_free(5);
 test_push_pop(2000);