diff --git a/Makefile.linux b/Makefile.linux
index 40498e3..c87ecdc 100644
--- a/Makefile.linux
+++ b/Makefile.linux
@@ -12,7 +12,7 @@ all :  $(APPS) direwolf.desktop direwolf.conf
 	@echo " "
 
 CC := gcc
-CFLAGS := -O3 -pthread -Igeotranz
+CFLAGS := -O3 -pthread -Igeotranz -g -D_XOPEN_SOURCE=600 -D_DEFAULT_SOURCE=1
 
 LDFLAGS := -lm -lpthread -lrt