muscle: compile with GCC for Darwin (#321551)

pkgs/applications/science/biology/muscle/default.nix

@@ -1,10 +1,9 @@
-{ lib, stdenv, fetchFromGitHub }:
+{ lib, gccStdenv, fetchFromGitHub }:
 
-stdenv.mkDerivation rec {
+gccStdenv.mkDerivation rec {
   pname = "muscle";
   version = "5.1.0";
 
-
   src = fetchFromGitHub {
     owner = "rcedgar";
     repo = pname;
@@ -14,8 +13,19 @@ stdenv.mkDerivation rec {
 
   sourceRoot = "${src.name}/src";
 
-  installPhase = ''
-    install -m755 -D Linux/muscle $out/bin/muscle
+  patches = [
+    ./muscle-darwin-g++.patch
+  ];
+
+  installPhase =
+    let
+      target =
+        if gccStdenv.isDarwin
+        then "Darwin"
+        else "Linux";
+    in
+    ''
+      install -m755 -D ${target}/muscle $out/bin/muscle
     '';
 
   meta = with lib; {

pkgs/applications/science/biology/muscle/muscle-darwin-g++.patch

@@ -0,0 +1,15 @@
+
+diff --git a/Makefile b/Makefile
+index df16673..be3bd0d 100644
+--- a/Makefile
++++ b/Makefile
+@@ -20,9 +20,6 @@ OS := $(shell uname)
+ CPPFLAGS := $(CPPFLAGS) -DNDEBUG -pthread
+ 
+ CXX := g++
+-ifeq ($(OS),Darwin)
+-	CXX := g++-11
+-endif
+ 
+ CXXFLAGS := $(CXXFLAGS) -O3 -fopenmp -ffast-math
+