--- a/mingw.mk	Sun Jun 10 12:35:00 2018 +0200
+++ b/mingw.mk	Sun Jun 10 13:22:04 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