--- firefox-100.0/ipc/chromium/moz.build.old	2022-04-05 18:19:54.888747095 +0000
+++ firefox-100.0/ipc/chromium/moz.build	2022-04-05 18:20:28.455337004 +0000
@@ -126,6 +126,8 @@
 if CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
     CXXFLAGS += CONFIG["MOZ_GTK3_CFLAGS"]
 
+CXXFLAGS += CONFIG['MOZ_LIBEVENT_CFLAGS']
+
 TEST_DIRS += [
     "gtest",
 ]