x11-toolkits/qt5-gamepad: unbreak after 020693c1

Project MESSAGE: perl -w /usr/local/lib/qt5/bin/syncqt.pl -module QtGamepad -version 5.15.8 -outdir /wrkdirs/usr/ports/x11-toolkits/qt5-gamepad/work/kde-qtgamepad-5.15.8p0 -builddir /wrkdirs/usr/ports/x11-toolkits/qt5-gamepad/work/kde-qtgamepad-5.15.8p0 /wrkdirs/usr/ports/x11-toolkits/qt5-gamepad/work/kde-qtgamepad-5.15.8p0
sh: perl: not found

PR:		266007
Reported by:	antoine (via exp-run)

x11-toolkits/qt5-gamepad/Makefile

@@ -8,7 +8,8 @@ COMMENT=	Qt 5 Gamepad Module
 
 BUILD_DEPENDS=	${LOCALBASE}/include/linux/input.h:devel/evdev-proto
 
-USES=		compiler:c++11-lang qmake:norecursive qt-dist:5,gamepad
+USES=		compiler:c++11-lang perl5 qmake:norecursive qt-dist:5,gamepad
+USE_PERL5=	build
 USE_QT=		core declarative gui buildtools:build
 
 .include <bsd.port.mk>