diff --color -ur synapse-0.2.99.4.orig/configure.ac synapse-0.2.99.4/configure.ac
--- synapse-0.2.99.4.orig/configure.ac	2018-04-08 20:52:10.000000000 +0200
+++ synapse-0.2.99.4/configure.ac	2021-11-24 16:47:10.073022755 +0100
@@ -110,16 +110,16 @@
 AM_CONDITIONAL(HAVE_ZEITGEIST, test "x$enable_zeitgeist" = "xyes")
 
 if test "x$enable_indicator" = "xauto" ; then
-	PKG_CHECK_EXISTS([appindicator3-0.1],
+	PKG_CHECK_EXISTS([ayatana-appindicator3-0.1],
 	                 enable_indicator="yes",
 	                 enable_indicator="no")
 fi
 
 if test "x$enable_indicator" = "xyes" ; then
-	PKG_CHECK_EXISTS([appindicator3-0.1],,
-	                 AC_MSG_ERROR([appindicator3-0.1 is not installed]))
-	PKG_CHECK_MODULES(APP_INDICATOR, appindicator3-0.1)
-	APP_INDICATOR_VALAFLAGS=" --pkg appindicator3-0.1 -D HAVE_INDICATOR"
+	PKG_CHECK_EXISTS([ayatana-appindicator3-0.1],,
+	                 AC_MSG_ERROR([ayatana-appindicator3-0.1 is not installed]))
+	PKG_CHECK_MODULES(APP_INDICATOR, ayatana-appindicator3-0.1)
+	APP_INDICATOR_VALAFLAGS=" --pkg ayatana-appindicator3-0.1 -D HAVE_INDICATOR"
 	AC_SUBST(APP_INDICATOR_VALAFLAGS)
 	AC_DEFINE(HAVE_INDICATOR, 1, [Have AppIndicator])
 fi