we're passing absolute path so don't prepand "$prefix/"
Source0: https://gitlab.freedesktop.org/mesa/mesa/-/archive/mesa-%{version}/mesa-mesa-%{version}.tar.bz2
# Source0-md5: 64fefeab30a36fd64be935e66c450154
Patch0: nouveau_no_rtti.patch
+Patch1: dridriverdir.patch
URL: http://www.mesa3d.org/
%{?with_opencl:BuildRequires: clang-devel >= %{llvm_ver}}
BuildRequires: elfutils-devel
%setup -q -n mesa-mesa-%{version}
%patch0 -p1
+%patch1 -p1
%build
--- /dev/null
+--- mesa-mesa-18.3.4/src/mesa/drivers/dri/meson.build.orig 2019-03-05 19:44:11.161362920 +0100
++++ mesa-mesa-18.3.4/src/mesa/drivers/dri/meson.build 2019-03-05 19:44:45.604494243 +0100
+@@ -78,7 +78,7 @@
+ filebase : 'dri',
+ description : 'Direct Rendering Infrastructure',
+ version : meson.project_version(),
+- variables : ['dridriverdir=${prefix}/' + dri_drivers_path],
++ variables : ['dridriverdir=' + dri_drivers_path],
+ requires_private : dri_req_private,
+ )
+ endif