1 files changed, 2 insertions, 1 deletions
diff --git a/config.mk b/config.mk
index c570914..06b69fa 100644
--- a/config.mk
+++ b/config.mk
@@ -9,7 +9,8 @@ MANPREFIX = ${PREFIX}/share/man
 INCS = -I.
 LIBS = -lc -lncursesw
 
-CFLAGS += -std=c99 -Os ${INCS} -DVERSION=\"${VERSION}\" -DNDEBUG
+CFLAGS += -std=c99 -Os ${INCS} -DVERSION=\"${VERSION}\" -DNDEBUG -D_POSIX_C_SOURCE=200809L -D_XOPEN_SOURCE=700
+
 LDFLAGS += ${LIBS}
 
 DEBUG_CFLAGS = ${CFLAGS} -UNDEBUG -O0 -g -ggdb -Wall -Wextra -Wno-missing-field-initializers -Wno-unused-parameter