You'll need to actually add it to BUILD_DEPENDS e.g.

.if ${MODQT6_DEPS:L} == "yes"
BUILD_DEPENDS += ${MODQT6_BUILD_DEPENDS}
LIB_DEPENDS += ${MODQT6_LIB_DEPENDS}
.endif

But then you'll also need to knock out the dep in qttools itself and 
anything that qttools depends on.

-- 
  Sent from a phone, apologies for poor formatting.

On 17 February 2024 08:09:03 Rafael Sadowski <rafael@sizeofvoid.org> wrote:

> OK to add qttools as a build dependency for all qt6 ports? We're doing
> the same in qt5.port.mk.
>
> I'm currently porting more and more Qt6 consumers that shows me that I
> almost always need a tool from qttools.
>
>
> Index: qt6.port.mk
> ===================================================================
> RCS file: /cvs/ports/x11/qt6/qt6.port.mk,v
> diff -u -p -r1.7 qt6.port.mk
> --- qt6.port.mk	2 Sep 2023 08:25:20 -0000	1.7
> +++ qt6.port.mk	17 Feb 2024 07:58:56 -0000
> @@ -34,11 +34,15 @@ _MODQT6_SETUP +=	Qt6_DIR=${MODQT6_LIBDIR
> MODQT6_LIB_DEPENDS =	x11/qt6/qtbase
> MODQT_LIB_DEPENDS ?=	${MODQT6_LIB_DEPENDS}
>
> +# qdoc, etc.
> +MODQT6_BUILD_DEPENDS = 	x11/qt6/qttools
> +
> MODQT_DEPS ?=		Yes
> MODQT6_DEPS ?=		${MODQT_DEPS}
>
> .if ${MODQT6_DEPS:L} == "yes"
> LIB_DEPENDS +=		${MODQT6_LIB_DEPENDS}
> +BUILD_DEPENDS += 	${MODQT6_BUILD_DEPENDS}
> .endif
>
> CONFIGURE_ENV +=	${_MODQT6_SETUP}