1 files changed, 1 insertions, 0 deletions
diff --git a/etc/sh/rc b/etc/sh/rc
index 3bcbd5e..b06eb3a 100644
--- a/etc/sh/rc
+++ b/etc/sh/rc
@@ -125,6 +125,7 @@ VG_FLAGS="$(echo "$VG_FLAGS" | grep . | tr -d '\t' | tr '\n' ' ')"
 
 export CFLAGS='
 	-D_POSIX_C_SOURCE=200809L
+	-D_XOPEN_SOURCE=700
 	-std=c99
 	-Wall
 	-Wextra