--- a/mingw.mk	Sun Jun 24 12:44:05 2018 +0200
+++ b/mingw.mk	Thu Jun 28 16:52:54 2018 +0200
@@ -31,7 +31,7 @@
 AR = ar
 RM = rm
 
-CFLAGS  = -std=gnu99 -O2 -c 
+CFLAGS  = -std=gnu99 -g -c 
 COFLAGS = -o
 LDFLAGS = 
 LOFLAGS = -o