commit 18ea032974539d7f4db64d21a87fd174333b9e2c
Author: Christoph Moench-Tegeder <cmt@FreeBSD.org>

    build XErrorTrap for FreeBSD, too

diff --git dom/media/webrtc/libwebrtc_overrides/moz.build dom/media/webrtc/libwebrtc_overrides/moz.build
index ed9c450e5649..1ac213e48b28 100644
--- dom/media/webrtc/libwebrtc_overrides/moz.build
+++ dom/media/webrtc/libwebrtc_overrides/moz.build
@@ -34,7 +34,7 @@ UNIFIED_SOURCES += [
     "call/call_basic_stats.cc",
 ]
 
-if CONFIG["OS_TARGET"] == "OpenBSD":
+if CONFIG["OS_TARGET"] in ("FreeBSD", "OpenBSD"):
     CXXFLAGS += CONFIG["MOZ_X11_CFLAGS"]
     UNIFIED_SOURCES += [
         "modules/desktop_capture/linux/x11/x_error_trap.cc",