Bug: https://bugs.gentoo.org/651012

--- a/src/plugins/tts/speechdispatcher/speechdispatcher.pro
+++ b/src/plugins/tts/speechdispatcher/speechdispatcher.pro
@@ -5,6 +5,7 @@
 load(qt_plugin)
 
 QT += core texttospeech
+QT -= gui
 
 CONFIG += link_pkgconfig
 packagesExist(speech-dispatcher): PKGCONFIG = speech-dispatcher