argbash: fix build

* Fixed sourceRoot as it's not possible to write in a different
  store-path (`${src}` in this case).
* Patched shebangs to not use `/bin/bash`.
* Added `docutils` to nativeBuildInputs to fix build of the man-pages

See also https://hydra.nixos.org/build/110901127

pkgs/development/tools/misc/argbash/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, autoconf }:
+{ stdenv, fetchFromGitHub, autoconf, runtimeShell, python3Packages, makeWrapper }:
 
 stdenv.mkDerivation rec {
   pname = "argbash";
@@ -12,12 +12,24 @@ stdenv.mkDerivation rec {
     sha256 = "0zara7v3pnwiwkpb0x0g37pxhmim4425q4gba712f6djj115r1mr";
   };
 
-  sourceRoot = "${src}/resources";
+  sourceRoot = "source/resources";
 
-  nativeBuildInputs = [ autoconf ];
+  postPatch = ''
+    chmod -R +w ..
+    patchShebangs ..
+    substituteInPlace Makefile \
+      --replace '/bin/bash' "${runtimeShell}"
+  '';
+
+  nativeBuildInputs = [ autoconf python3Packages.docutils makeWrapper ];
 
   makeFlags = [ "PREFIX=$(out)" ];
 
+  postInstall = ''
+    wrapProgram $out/bin/argbash \
+      --prefix PATH : '${autoconf}/bin'
+  '';
+
   meta = with stdenv.lib; {
     description = "Bash argument parsing code generator";
     homepage = "https://argbash.io/";