--- Makefile.orig	2020-04-23 22:14:49.000000000 +0200
+++ Makefile	2020-04-26 18:27:31.863527000 +0200
@@ -47,6 +47,14 @@
 		${WRKSRC}/src/corelib/global/qglobal.cpp
 .endif
 
+_BUILDTOOLS_VERSION!=${PKG_BIN} query %v qt5-buildtools
+_BUILDTOOLS_STATUS!=${PKG_BIN} version -t ${_BUILDTOOLS_VERSION} ${QT5_VERSION}
+
+pre-check-config:
+.if ${_BUILDTOOLS_STATUS} == "<"
+.error	"Your devel/qt5-buildtools version is too old. Please upgrade it first."
+.endif
+
 post-configure:
 .for d in ${MORE_WRKSRCS}
 	${MKDIR} ${WRKSRC}/${d}