can you do make menuconfig and see if your package's "libxerces" error message is displayed. My setup for custom packages looks something like this:
mkdir package/custom mkdir package/custom/ ln -s /path/to/package/libxerces/ package/custom/
If your make file is correct, then Libraries-> libxerces should appear in menuconfig, if you should not display an error message in make / make menuconfig. You can also do make package/libxerces/compile etc. Note. Your package name is libxerces, not libxerces-c.
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