https://github.com/OrancheloTeam/oranchelo-icon-theme/releases/tag/v0.9.0 We use the upstream Makefile instead of copying the files manually in the installPhase.
Most icons themes just copy a bunch of files from the source to the installation directory and therefore work perfectly fine with stdenvNoCC. All themes in pkgs/data/icons that still use stdenv after this change are failing to build with stdenvNoCC.