_3proxy: fix cross-compilation

pkgs/applications/networking/3proxy/default.nix

···
-{ lib, stdenv, fetchFromGitHub, coreutils, nixosTests }:
+{ lib, stdenv, fetchFromGitHub, nixosTests }:
 
 stdenv.mkDerivation rec {
   pname = "3proxy";
   version = "0.9.4";
 
   src = fetchFromGitHub {
-    owner = "z3APA3A";
+    owner = "3proxy";
     repo = pname;
     rev = version;
     sha256 = "sha256-4bLlQ/ULvpjs6fr19yBBln5mRRc+yj+zVLiTs1e/Ypc=";
   };
 
+  # They use 'install -s', that calls the native strip instead of the cross.
+  # Don't strip binary on install, we strip it on fixup phase anyway.
+  postPatch = ''
+    substituteInPlace Makefile.Linux \
+      --replace "(INSTALL_BIN) -s" "(INSTALL_BIN)" \
+      --replace "/usr" ""
+  '';
+
   makeFlags = [
     "-f Makefile.Linux"
-    "INSTALL=${coreutils}/bin/install"
+    "INSTALL=install"
     "DESTDIR=${placeholder "out"}"
+    "CC:=$(CC)"
   ];
 
+  postInstall = ''
+    rm -fr $out/var
+  '';
+
   passthru.tests = {
     smoke-test = nixosTests._3proxy;
   };
 
   meta = with lib; {
     description = "Tiny free proxy server";
-    homepage = "https://github.com/z3APA3A/3proxy";
+    homepage = "https://github.com/3proxy/3proxy";
     license = licenses.bsd2;
     platforms = platforms.linux;
     maintainers = with maintainers; [ misuzu ];