1 files changed, 1 insertions, 1 deletions
diff --git a/configure b/configure
index 3b43e6c..b169a66 100755
--- a/configure
+++ b/configure
@@ -64,7 +64,7 @@ export STRIP="${STRIP:-strip}"
 #
 export cc_flags="-std=$c_version -O2 -pipe"
 export cc_flags="$cc_flags -D_POSIX_C_SOURCE=200809L"
-export cc_flags="$cc_flags -D_BSD_SOURCE -D_XOPEN_SOURCE=500"
+export cc_flags="$cc_flags -D_BSD_SOURCE -D_GNU_SOURCE"
 export cc_flags="$cc_flags -Wall -Wextra -pedantic -Wshadow"