From 6ba632c2a442082f353bf2d7028fda11a888d099 Mon Sep 17 00:00:00 2001
From: Vincenzo Mantova <xworld21@users.sf.net>
Date: Sat, 13 Mar 2021 18:58:21 +0000
Subject: [PATCH] stdenv: ignore duplicates in addToSearchPath (#113800)

---
 pkgs/stdenv/generic/setup.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index 7168ce4084c8..a73474c952e5 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -157,7 +157,8 @@ addToSearchPathWithCustomDelimiter() {
     local delimiter="$1"
     local varName="$2"
     local dir="$3"
-    if [ -d "$dir" ]; then
+    if [[ -d "$dir" && "${!varName:+${delimiter}${!varName}${delimiter}}" \
+          != *"${delimiter}${dir}${delimiter}"* ]]; then
         export "${varName}=${!varName:+${!varName}${delimiter}}${dir}"
     fi
 }