--- mate-submodules/libegg/Makefile.am.alt	2020-04-26 15:37:57.000000000 +0300
+++ mate-submodules/libegg/Makefile.am	2021-08-06 16:17:54.309052063 +0300
@@ -10,6 +10,7 @@ platform_sources = eggsmclient-xsmp.c
 
 AM_CPPFLAGS =                            \
 	-DG_LOG_DOMAIN=\""EggSMClient"\" \
+	$(GTK3_CFLAGS) \
 	$(platform_defines)              \
 	$(EGG_SMCLIENT_CFLAGS)           \
 	$(SM_CFLAGS)			 \