eviacam fails to cross build from source, because configure.ac hard
codes the build architecture pkg-config. Please use PKG_PROG_PKG_CONFIG
to discover the correct pkg-config. I'm attaching a patch for this and
it makes eviacam cross buildable. An even better solution would be
switching to the PKG_CHECK_MODULES macro if upstream so wishes. Please
consider applying the attached patch as a minimal improvement.

Helmut