1 files changed, 1 insertions, 1 deletions
diff --git a/config.mk b/config.mk
index 9e148ca..a2b8a0f 100644
--- a/config.mk
+++ b/config.mk
@@ -2,5 +2,5 @@ PREFIX = /usr/local
 MANPREFIX = $(PREFIX)/share/man
 
 CFLAGS   = -std=c99 -Wall -Wextra -O2
-CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE
 LDFLAGS  = -s