depot/third_party/nixpkgs/pkgs/development/libraries/mesa/opencl.patch

diff --git a/meson.build b/meson.build
index fbb0b29322d..b4825056449 100644
--- a/meson.build
+++ b/meson.build
@@ -1805,7 +1805,7 @@ endif
 
 dep_clang = null_dep
 if with_clc
-  llvm_libdir = dep_llvm.get_variable(cmake : 'LLVM_LIBRARY_DIR', configtool: 'libdir')
+  llvm_libdir = get_option('clang-libdir')
 
   dep_clang = cpp.find_library('clang-cpp', dirs : llvm_libdir, required : false)
 
diff --git a/meson_options.txt b/meson_options.txt
index e885ba61a8a..591ed957c85 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -23,6 +23,12 @@ option(
   description : 'the window system EGL assumes for EGL_DEFAULT_DISPLAY',
 )
 
+option(
+  'clang-libdir',
+  type : 'string',
+  value : '',
+  description : 'Locations to search for clang libraries.'
+)
 option(
   'android-stub',
   type : 'boolean',
diff --git a/src/gallium/targets/opencl/meson.build b/src/gallium/targets/opencl/meson.build
index 7c14135898e..74dc6850603 100644
--- a/src/gallium/targets/opencl/meson.build
+++ b/src/gallium/targets/opencl/meson.build
@@ -39,7 +39,8 @@ if dep_llvm.version().version_compare('>=10.0.0')
   polly_isl_dep = cpp.find_library('PollyISL', dirs : llvm_libdir, required : false)
 endif
 
-dep_clang = cpp.find_library('clang-cpp', dirs : llvm_libdir, required : false)
+clang_libdir = get_option('clang-libdir')
+dep_clang = cpp.find_library('clang-cpp', dirs : clang_libdir, required : false)
 
 # meson will return clang-cpp from system dirs if it's not found in llvm_libdir
 linker_rpath_arg = '-Wl,--rpath=@0@'.format(llvm_libdir)
@@ -123,7 +124,7 @@ if with_opencl_icd
     configuration : _config,
     input : 'mesa.icd.in',
     output : 'mesa.icd',
-    install : true,
+    install : false,
     install_tag : 'runtime',
     install_dir : join_paths(get_option('sysconfdir'), 'OpenCL', 'vendors'),
   )
diff --git a/src/gallium/targets/rusticl/meson.build b/src/gallium/targets/rusticl/meson.build
index b2963fe6dfa..99d6d801b94 100644
--- a/src/gallium/targets/rusticl/meson.build
+++ b/src/gallium/targets/rusticl/meson.build
@@ -76,7 +76,7 @@ configure_file(
   configuration : _config,
   input : 'rusticl.icd.in',
   output : 'rusticl.icd',
-  install : true,
+  install : false,
   install_tag : 'runtime',
   install_dir : join_paths(get_option('sysconfdir'), 'OpenCL', 'vendors'),
 )