I am building a package that needs the value of a make variable from
another package.  I am trying to do this with the following in my
package Makefile:

XXX!=   cd ../../category/package && ${MAKE} show-var VARNAME=XXX

However, I am getting a variety of errors that seem to be related to
the wrappers and buildlink handling.

Is there an established way to accomplish this?

Thanks for your help.

Cheers,
Brook