meson toolchain leaves out PKG_DEPENDS_TARGET and mesa fails to buid

As usually i build my own LibreELEC from sources. My setup includes as graphic adapter a nvidia GT730, so, in distributions/LibreELEC/options I've cleaned up the GRAPHIC_DRIVERS variable leaving only "nvidia".

This way, mesa stops building and give me this error:

Problem encountered: EGL requires dri

I guess this is because the variable PKG_DEPENDS_TARGET in package.mk, although is properly formed, is not honored in the build process, so packages from which mesa depends are not built (all the X11 stuff).

If i add to the variable GRAPHIC_DRIVERS in distributions/LibreELEC/options a gallium3D driver such r600, build process picks its dependencies which satisfy the mesa package and i got no errors.

Unfortunately, despite what meson web site claims, it is not a user friendly build system, so no help from logs

Thank you 5schatten!! I tried with the autotools version as you suggested and, after some minor fixes due to xorgproto, it compile flawlessly.

So maybe this is a bug in how the meson build system handle package.mk variables?

Building via autotools, imho, is only a workaround, I'll investigate to understand why meson won't build without at least one gallium driver set

inusasha googling here and there, and as result of my tests, I have come to the conclusion that scripts are working as expected and there aren't missing dependencies. Simply "nvidia" is not (yet?) supported in meson.build. So i have four choises:

1. build another supported driver to please meson.build (any gallium driver is ok here);
2. proceed on my own using the autotools and moving away from the official LibreELEC branch;
3. play with package.mk and drop mesa only for nvidia builds (if this doesn't break things), committing (if success) a pr
4. anything else other than it doesn't now assist me