python3Packages.ttfautohint-py: fix loading some modules (#378514)

pkgs/development/python-modules/ttfautohint-py/default.nix

@@ -23,10 +23,15 @@ buildPythonPackage rec {
     hash = "sha256-NTog461RpyHKo/Qpicj3tflehaKj9LlZEN9qeCMM6JQ=";
   };
 
-  postPatch = ''
-    substituteInPlace src/python/ttfautohint/__init__.py \
-      --replace-fail 'find_library("ttfautohint")' '"${lib.getLib ttfautohint}/lib/libttfautohint${stdenv.hostPlatform.extensions.sharedLibrary}"'
-  '';
+  postPatch =
+    ''
+      substituteInPlace src/python/ttfautohint/__init__.py \
+        --replace-fail 'find_library("ttfautohint")' '"${lib.getLib ttfautohint}/lib/libttfautohint${stdenv.hostPlatform.extensions.sharedLibrary}"'
+    ''
+    + lib.optionalString stdenv.hostPlatform.isLinux ''
+      substituteInPlace src/python/ttfautohint/memory.py \
+        --replace-fail 'find_library("c")' '"${lib.getLib stdenv.cc.libc}/lib/libc.so.6"'
+    '';
 
   env.TTFAUTOHINTPY_BUNDLE_DLL = false;
 
@@ -36,6 +41,10 @@ buildPythonPackage rec {
     distutils
   ];
 
+  dependencies = [
+    setuptools # for pkg_resources
+  ];
+
   buildInputs = [ ttfautohint ];
 
   nativeCheckInputs = [