From ce4f1098ca6e49ac335ce9481b794bacbce17947 Mon Sep 17 00:00:00 2001
From: Jude Taylor <me@jude.bio>
Date: Thu, 29 Oct 2015 13:55:58 -0700
Subject: [PATCH] reduce security setup hook duplication

---
 pkgs/os-specific/darwin/apple-sdk/security-setup-hook.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pkgs/os-specific/darwin/apple-sdk/security-setup-hook.sh b/pkgs/os-specific/darwin/apple-sdk/security-setup-hook.sh
index b6a129acb19..f31adaa0d74 100644
--- a/pkgs/os-specific/darwin/apple-sdk/security-setup-hook.sh
+++ b/pkgs/os-specific/darwin/apple-sdk/security-setup-hook.sh
@@ -1,7 +1,10 @@
 noDeprecatedDeclarations() {
   # Security.framework has about 2000 deprecated constants, all of which the user will be
   # warned about at compilation time
-  NIX_CFLAGS_COMPILE+=" -Wno-deprecated-declarations"
+  flag="-Wno-deprecated-declarations"
+  if [[ "$NIX_CFLAGS_COMPILE" != *$flag* ]]; then
+    NIX_CFLAGS_COMPILE+=" $flag"
+  fi
 }
 
 envHooks+=(noDeprecatedDeclarations)