groff: Enable cross-compilation

pkgs/tools/text/groff/default.nix

@@ -2,6 +2,7 @@
 , ghostscript #for postscript and html output
 , psutils, netpbm #for html output
 , buildPackages
+, autoreconfHook
 }:
 
 stdenv.mkDerivation rec {
@@ -17,6 +18,8 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = false;
 
+  patches = [ ./look-for-ar.patch ];
+
   postPatch = stdenv.lib.optionalString (psutils != null) ''
     substituteInPlace src/preproc/html/pre-html.cpp \
       --replace "psselect" "${psutils}/bin/psselect"
@@ -32,6 +35,7 @@ stdenv.mkDerivation rec {
   '';
 
   buildInputs = [ ghostscript psutils netpbm perl ];
+  nativeBuildInputs = [ autoreconfHook ];
 
   # Builds running without a chroot environment may detect the presence
   # of /usr/X11 in the host system, leading to an impure build of the
@@ -42,6 +46,8 @@ stdenv.mkDerivation rec {
     "--without-x"
   ] ++ stdenv.lib.optionals (ghostscript != null) [
     "--with-gs=${ghostscript}/bin/gs"
+  ] ++ stdenv.lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
+    "ac_cv_path_PERL=${perl}/bin/perl"
   ];
 
   doCheck = true;