From bf71f459d208c3ef46ac6c186113c929b3aab77e Mon Sep 17 00:00:00 2001
From: Ryan Burns <rtburns@protonmail.com>
Date: Sun, 20 Sep 2020 17:58:08 -0700
Subject: [PATCH] liboping: fix build on Darwin

---
 pkgs/development/libraries/liboping/default.nix | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/libraries/liboping/default.nix b/pkgs/development/libraries/liboping/default.nix
index 1b2d83b84d0..956538b7624 100644
--- a/pkgs/development/libraries/liboping/default.nix
+++ b/pkgs/development/libraries/liboping/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ncurses ? null, perl ? null }:
+{ stdenv, fetchurl, ncurses ? null, perl ? null, lib }:
 
 stdenv.mkDerivation rec {
   name = "liboping-1.10.0";
@@ -8,7 +8,8 @@ stdenv.mkDerivation rec {
     sha256 = "1n2wkmvw6n80ybdwkjq8ka43z2x8mvxq49byv61b52iyz69slf7b";
   };
 
-  NIX_CFLAGS_COMPILE = "-Wno-error=format-truncation";
+  NIX_CFLAGS_COMPILE = lib.optionalString
+    stdenv.cc.isGNU "-Wno-error=format-truncation";
 
   buildInputs = [ ncurses perl ];