Index: head/graphics/mesa-dri/files/patch-meson.build
===================================================================
--- head/graphics/mesa-dri/files/patch-meson.build	(revision 538007)
+++ head/graphics/mesa-dri/files/patch-meson.build	(revision 538008)
@@ -1,26 +1,47 @@
 - Do not define GLX_USE_TLS, this doesn't work on all FreeBSD version
   Later mesa version rename this to USE_ELF_TLS and make it conditional
   on some platform, but for now simply comment it here.
   See https://github.com/dumbbell/test-tls-initial-exec for more info
 - Add dependency on libxv for xvmc, this is fixed in later mesa version.
 --- meson.build.orig	2019-06-26 20:14:08 UTC
 +++ meson.build
+@@ -25,7 +25,7 @@ project(
+     [find_program('python', 'python2', 'python3'), 'bin/meson_get_version.py']
+   ).stdout(),
+   license : 'MIT',
+-  meson_version : '>= 0.45',
++  meson_version : '>= 0.46',
+   default_options : ['buildtype=debugoptimized', 'b_ndebug=if-release', 'c_std=c99', 'cpp_std=c++11']
+ )
+ 
 @@ -336,7 +336,7 @@ if with_egl and not (with_platform_drm or with_platfor
    endif
  endif
  
 -pre_args += '-DGLX_USE_TLS'
 +#pre_args += '-DGLX_USE_TLS'
  if with_glx != 'disabled'
    if not (with_platform_x11 and with_any_opengl)
      error('Cannot build GLX support without X11 platform support and at least one OpenGL API')
 @@ -458,7 +458,8 @@ dep_xvmc = null_dep
  with_gallium_xvmc = false
  if _xvmc != 'false'
    dep_xvmc = dependency('xvmc', version : '>= 1.0.6', required : _xvmc == 'true')
 -  with_gallium_xvmc = dep_xvmc.found()
 +  dep_xv = dependency('xv', required: _xvmc == 'true')
 +  with_gallium_xvmc = dep_xvmc.found() and dep_xv.found()
  endif
  
  xvmc_drivers_path = get_option('xvmc-libs-path')
+@@ -1053,10 +1054,7 @@ if cc.links('int main() { return 0; }',
+             name : 'dynamic-list')
+   with_ld_dynamic_list = true
+ endif
+-ld_args_build_id = []
+-if build_machine.system() != 'darwin'
+-   ld_args_build_id += '-Wl,--build-id=sha1'
+-endif
++ld_args_build_id = cc.get_supported_link_arguments('-Wl,--build-id=sha1')
+ 
+ # check for dl support
+ if cc.has_function('dlopen')