1 files changed, 1 insertions, 0 deletions
diff --git a/config.mk b/config.mk
index 1a4119f..2a8a719 100644
--- a/config.mk
+++ b/config.mk
@@ -1,5 +1,6 @@
 PREFIX = /usr/local
 
+CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700L
 CFLAGS = -std=c99 -pedantic -Wall -Wno-deprecated-declarations -Os
 LDFLAGS = -lm -lX11