[CMake] parallel builds (ctest_build() ) for dashboards ?

[Alexander Neundorf]

Hi,

I'm running some dashboard builds and didn't find a way how to make the builds 
(via ctest_build()) run parallel, e.g. make -4.
For ctest_test() there is a PARALLEL_LEVEL option, I didn't find this for 
ctest_build().
Is it possible to do this ?

Alex