diff --git a/pkgs/build-support/libredirect/default.nix b/pkgs/build-support/libredirect/default.nix
index e92945a4030c..7caca2fc0033 100644
--- a/pkgs/build-support/libredirect/default.nix
+++ b/pkgs/build-support/libredirect/default.nix
@@ -10,6 +10,8 @@ stdenv.mkDerivation {
 
   libName = "libredirect" + stdenv.targetPlatform.extensions.sharedLibrary;
 
+  outputs = ["out" "hook"];
+
   buildPhase = ''
     $CC -Wall -std=c99 -O3 -shared libredirect.c \
       -o "$libName" -fPIC -ldl
@@ -21,17 +23,25 @@ stdenv.mkDerivation {
 
   installPhase = ''
     install -vD "$libName" "$out/lib/$libName"
+
+    mkdir -p "$hook/nix-support"
+    cat <<SETUP_HOOK > "$hook/nix-support/setup-hook"
+    ${if stdenv.isDarwin then ''
+    export DYLD_INSERT_LIBRARIES="$out/lib/$libName"
+    export DYLD_FORCE_FLAT_NAMESPACE=1
+    '' else ''
+    export LD_PRELOAD="$out/lib/$libName"
+    ''}
+    SETUP_HOOK
   '';
 
   doInstallCheck = true;
 
-  installCheckPhase = if stdenv.isDarwin then ''
-    NIX_REDIRECTS="/foo/bar/test=${coreutils}/bin/true" \
-    DYLD_INSERT_LIBRARIES="$out/lib/$libName" \
-    DYLD_FORCE_FLAT_NAMESPACE=1 ./test
-  '' else ''
-    NIX_REDIRECTS="/foo/bar/test=${coreutils}/bin/true" \
-    LD_PRELOAD="$out/lib/$libName" ./test
+  installCheckPhase = ''
+    (
+      source "$hook/nix-support/setup-hook"
+      NIX_REDIRECTS="/foo/bar/test=${coreutils}/bin/true" ./test
+    )
   '';
 
   meta = {