Thank you for the feedback. I said "out of tree" but I don't know if this is the correct term here. It is not used in the same sense as in cmake.
What I mean is that I don't want the package to be built in local_src/<pkg>. Rather it should be copied to a new directory (this is being already done when I set <PKG>_BUILD_OOT -- everything is copied to platform/build-target/<pkg>) and build there. The only problem is that ptxdist tries to build in a *different* directory (platform/build-target/<pkg>-build), which is empty.
I think there must be a way to do this more or less easily. I really don't want to switch to CMake just for this..
BR,
Guillermo