1 files changed, 1 insertions, 1 deletions
diff --git a/config.mk b/config.mk
index f4ac0df..dbd8a92 100644
--- a/config.mk
+++ b/config.mk
@@ -1,6 +1,6 @@
 PREFIX    = /usr
 MANPREFIX = $(PREFIX)/share/man
 
-CPPFLAGS = -D_XOPEN_SOURCE=700
+CPPFLAGS = -D_XOPEN_SOURCE=700 -D_GNU_SOURCE
 CFLAGS   = -std=c99 -Wall -O2
 LDFLAGS  = -s