configure, meson: Use legacy gl/epoxy detection for now

configure

@@ -1550,6 +1550,16 @@ case "$fdt" in
     ;;
 esac
 
+##########################################
+# epoxy probe
+if $pkg_config --libs --silence-errors epoxy > /dev/null 2>&1 ; then
+    epoxy_libs=$($pkg_config --libs --silence-errors epoxy)
+    epoxy_cflags=$($pkg_config --cflags --silence-errors epoxy)
+else
+    error_exit "epoxy not present." \
+        "Please install the epoxy devel package."
+fi
+
 ##########################################
 # check and set a backend for coroutine
 
@@ -2424,6 +2434,10 @@ echo "GLIB_VERSION=$(pkg-config --modversion glib-2.0)" >> $config_host_mak
 echo "QEMU_LDFLAGS=$QEMU_LDFLAGS" >> $config_host_mak
 echo "EXESUF=$EXESUF" >> $config_host_mak
 
+# FIXME: Use meson
+echo "EPOXY_CFLAGS=$epoxy_cflags" >> $config_host_mak
+echo "EPOXY_LIBS=$epoxy_libs" >> $config_host_mak
+
 # use included Linux headers
 if test "$linux" = "yes" ; then
   mkdir -p linux-headers

meson.build

@@ -1160,16 +1160,17 @@ opengl = not_found
 if not get_option('opengl').auto() or have_system or have_vhost_user_gpu
   # FIXME: Use meson's 'gl' dep
   if targetos == 'darwin'
-    opengl_libs=['-framework OpenGL']
+    opengl_libs=['-framework', 'OpenGL']
   elif targetos == 'windows'
     opengl_libs=['-lopengl32', '-lgdi32']
   elif targetos == 'linux'
     opengl_libs=['-lGLU', '-lGL']
+  else
+    error('Unknown GL platform')
   endif
-  epoxy = dependency('epoxy', method: 'pkg-config',
-                      required: true, kwargs: static_kwargs)
-  opengl = declare_dependency(link_args: opengl_libs,
-                              dependencies: epoxy)
+
+  opengl = declare_dependency(compile_args: config_host['EPOXY_CFLAGS'].split(),
+                              link_args: config_host['EPOXY_LIBS'].split() + opengl_libs)
 endif
 
 gbm = not_found