$NetBSD$

https://skia-review.googlesource.com/c/skia/+/310856

--- third_party/skia/third_party/angle2/BUILD.gn.orig	2020-07-15 19:01:41.000000000 +0000
+++ third_party/skia/third_party/angle2/BUILD.gn
@@ -37,8 +37,8 @@ config("common") {
     "$angle_root/src/third_party/khronos",
   ]
   cflags_cc = []
-  assert(is_linux || is_win)  # TODO: is_mac?
-  if (is_linux) {
+  assert(is_linux || is_win || is_bsd)  # TODO: is_mac?
+  if (is_linux || is_bsd) {
     defines += [
       "ANGLE_USE_X11",
       "GL_APICALL=__attribute__((visibility(\"default\")))",
@@ -112,7 +112,7 @@ shared_library("libGLESv2") {
   if (is_win) {
     sources += [ "$angle_root/src/libGLESv2/libGLESv2_autogen.def" ]
   }
-  if (is_linux) {
+  if (is_linux || is_bsd) {
     libs += [
       "X11",
       "Xi",