how to build outside WRKSRC?

["Pouya D. Tafti" <pouya%san-serriffe.org@localhost>]

Hi,

I am trying to create a package for ParaView [1].  ParaView uses
CMake, and needs to be built somewhere other than in its source dir.
What is the canonical way of doing this in pkgsrc?

I first tried setting BUILD_DIR, but it had no effect.

For the moment I have the following lines in my Makefile (please do
enlighten me if my attempt should be utterly misguided!):

PVBUILDDIR=                             ${WRKDIR}/ParaView-bin

do-configure:
    mkdir -p ${PVBUILDDIR}
    cd ${PVBUILDDIR} && ${CMAKE} ${WRKSRC}

I could go on and write do-build etc. as well, but that would be
rather inefficient I think.

Thanks,
Pouya

[1] <http://www.paraview.org/Wiki/ParaView:Build_And_Install>