From 2d3149f4a808c2f90ed1dbf188f7371d193e7964 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20=C4=8Cun=C3=A1t?= <vcunat@gmail.com>
Date: Tue, 7 Nov 2017 06:33:09 +0100
Subject: [PATCH] icu: only patch-out xlocale if using glibc

---
 pkgs/development/libraries/icu/base.nix | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pkgs/development/libraries/icu/base.nix b/pkgs/development/libraries/icu/base.nix
index b12e76a90a99..8a7cf8365a5b 100644
--- a/pkgs/development/libraries/icu/base.nix
+++ b/pkgs/development/libraries/icu/base.nix
@@ -26,7 +26,9 @@ stdenv.mkDerivation {
   '';
 
   # https://sourceware.org/glibc/wiki/Release/2.26#Removal_of_.27xlocale.h.27
-  postPatch = "substituteInPlace i18n/digitlst.cpp --replace '<xlocale.h>' '<locale.h>'";
+  postPatch = if stdenv ? glibc
+    then "substituteInPlace i18n/digitlst.cpp --replace '<xlocale.h>' '<locale.h>'"
+    else null; # won't find locale_t on darwin
 
   inherit patchFlags patches;