[aarch64-port-dev ] gmake error when cross compiling

[Andy Johnson]

I got this error too, until I realized that the cross_configure is now
configuring a "fastdebug" build, where previously it configured a "release"
build.  If you had done a previous build of
linux-aarch64-normal-client-release, that might be your problem.

Try setting CONF=linux-aarch64-normal-client-fastdebug prior to running the
cross_compile script.