--- build/config/BUILDCONFIG.gn.orig	2016-10-06 04:02:08.000000000 +0300
+++ build/config/BUILDCONFIG.gn	2016-10-13 04:48:31.029743000 +0300
@@ -134,12 +134,13 @@
   is_debug = !is_official_build
 
   # Whether we're a traditional desktop unix.
-  is_desktop_linux = current_os == "linux"
+  is_desktop_linux = current_os == "linux" || current_os == "bsd"
 
   # Set to true when compiling with the Clang compiler. Typically this is used
   # to configure warnings.
   is_clang = current_os == "mac" || current_os == "ios" ||
-             current_os == "linux" || current_os == "chromeos"
+             current_os == "linux" || current_os == "chromeos" ||
+             current_os == "bsd"
 
   # Allows the path to a custom target toolchain to be injected as a single
   # argument, and set as the default toolchain.
@@ -183,8 +184,8 @@
   # TODO(dpranke): Add some sort of assert here that verifies that
   # no toolchain omitted host_toolchain from its toolchain_args().
 
-  if (host_os == "linux") {
-    if (target_os != "linux") {
+  if (host_os == "linux" || host_os == "bsd") {
+    if (target_os != "linux" || target_os != "bsd") {
       # TODO(dpranke) - is_clang normally applies only to the target
       # build, and there is no way to indicate that you want to override
       # it for both the target build *and* the host build. Do we need to
@@ -220,7 +221,7 @@
   } else {
     _default_toolchain = "//build/toolchain/android:$target_cpu"
   }
-} else if (target_os == "chromeos" || target_os == "linux") {
+} else if (target_os == "chromeos" || target_os == "linux" || target_os == "bsd") {
   # See comments in build/toolchain/cros/BUILD.gn about board compiles.
   if (is_clang) {
     _default_toolchain = "//build/toolchain/linux:clang_$target_cpu"
@@ -340,8 +341,17 @@
   is_nacl = false
   is_posix = true
   is_win = false
+} else if (current_os == "bsd") {
+  is_android = false
+  is_chromeos = false
+  is_ios = false
+  is_linux = false
+  is_bsd = true
+  is_mac = false
+  is_nacl = false
+  is_posix = true
+  is_win = false
 }
-
 # =============================================================================
 # SOURCES FILTERS
 # =============================================================================
@@ -410,7 +420,7 @@
 if (!is_mac && !is_ios) {
   sources_assignment_filter += [ "*.mm" ]
 }
-if (!is_linux) {
+if (!is_linux && !is_bsd) {
   sources_assignment_filter += [
     "*_linux.h",
     "*_linux.cc",