darwin.stdenv: fix portable libsystem hook with sandboxing

When sandboxing is enabled, the hook tries to run `install_name_tool`
and fails because the system one is inaccessible. Having it use
`targetPrefix` allows it to find and use the cross-install_name_tool.

1 files changed, 1 insertions, 0 deletions

diff --git a/pkgs/stdenv/adapters.nix b/pkgs/stdenv/adapters.nix
index 3e66de48b4df7..22da13f5d1eb8 100644
--- a/pkgs/stdenv/adapters.nix
+++ b/pkgs/stdenv/adapters.nix
@@ -105,6 +105,7 @@ rec {
             name = "darwin-portable-libSystem-hook";
             substitutions = {
               libsystem = "${stdenv.cc.libc}/lib/libSystem.B.dylib";
+              targetPrefix = stdenv.cc.bintools.targetPrefix;
             };
           } ./darwin/portable-libsystem.sh)
         ];