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2a7a4d77d7
The original check was not compliant with autoconf's syntax, did not have a very good behaviour for user and was not easy to make evolve. The new macro: - uses as much as possible autoconf macros for portability and code consistency; - checks also for header usability with the compiler; - provides a consistent behaviour on yes/no/auto (if user explicitly enables support, do not silently disable if not found; if library is found but not the header, complain to let user install it or explicitly disable support) The feature is also no more disabled by default, as it is something user would expect from a modern window manager. Signed-off-by: Christophe CURIS <christophe.curis@free.fr>