From b935375becd5334720cf375d7a5773f4e343ea8e Mon Sep 17 00:00:00 2001
From: Christian Kampka <christian@kampka.net>
Date: Wed, 2 Sep 2020 17:04:41 +0200
Subject: [PATCH] gts: Fix cross compilation

gts generate binaries during the build process that are used during the
build process. When building cross-platform, these binaries are not
executable as they are built with for the target platform instead of the
host platform. The boostrap build introduced here will first build gts
natively and then cross-platform, using the native binaries in the
cross-build.
---
 pkgs/development/libraries/gts/default.nix | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/pkgs/development/libraries/gts/default.nix b/pkgs/development/libraries/gts/default.nix
index adf914369cf..48bdfc9b5e1 100644
--- a/pkgs/development/libraries/gts/default.nix
+++ b/pkgs/development/libraries/gts/default.nix
@@ -1,4 +1,4 @@
-{ fetchurl, stdenv, pkgconfig, autoreconfHook, gettext, glib }:
+{ fetchurl, stdenv, pkgconfig, autoreconfHook, gettext, glib, buildPackages }:
 
 
 stdenv.mkDerivation rec {
@@ -12,12 +12,26 @@ stdenv.mkDerivation rec {
     sha256 = "07mqx09jxh8cv9753y2d2jsv7wp8vjmrd7zcfpbrddz3wc9kx705";
   };
 
-  nativeBuildInputs = [ pkgconfig autoreconfHook ];
+  nativeBuildInputs = [
+    pkgconfig
+    autoreconfHook
+    glib  # required to satisfy AM_PATH_GLIB_2_0
+  ];
   buildInputs = [ gettext ];
   propagatedBuildInputs = [ glib ];
 
   doCheck = false; # fails with "permission denied"
 
+  preBuild = stdenv.lib.optionalString (stdenv.hostPlatform != stdenv.buildPlatform) ''
+    pushd src
+    make CC=${buildPackages.stdenv.cc}/bin/cc predicates_init
+    mv predicates_init predicates_init_build
+    make clean
+    popd
+
+    substituteInPlace src/Makefile --replace "./predicates_init" "./predicates_init_build"
+  '';
+
   meta = {
     homepage = "http://gts.sourceforge.net/";
     license = stdenv.lib.licenses.lgpl2Plus;