[GNU] Issues of cross-compiling in GNU build system.

* It is impossible to get full supporting from ‘configure’

Getting runtime informations – ex bytes of ‘long’ type, checking whether symbol ‘xxx’ is in the library or not. – is impossible.
-> Some releases complain this and doesn’t proceed anymore.

* Some releases still refer /lib, /usr/lib, /usr/include etc.

* Using ‘make check’ in naive way is impossible.

* Anything else???

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