diff --git a/project/config/cfgdefs.sh b/project/config/cfgdefs.sh
index 2db66e4..1d3014c 100644
--- a/project/config/cfgdefs.sh
+++ b/project/config/cfgdefs.sh
@@ -212,6 +212,12 @@ cfgdefs_perform_target_tests()
 	mb_cfgtest_makevar='LDFLAGS_TCLTK_LIBS'
 	cfgtest_makevar_append "$mb_tcltk_libs"
 
+	mb_cfgtest_makevar='CFLAGS_TCLTK'
+	cfgtest_makevar_append '-DWITH_APPINIT'
+
+	mb_cfgtest_makevar='LDFLAGS_TCLTK'
+	cfgtest_makevar_append '$(LDFLAGS_TCLTK_LIBS)'
+
 	# sqlite
 	cfgtest_newline
 	cfgtest_comment 'sqlite3'