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DATADIR, like any installation variable, is not known at configure time.
This is by design to allow setting the variable at make time.
The AX_DEFINE_DIR macro worked around this design and consequently
cancelled an Automake feature.
The alternative method suggested by Automake ends up being simpler
while providing the same result as AX_DEFINE_DIR but without cancelling
any feature. It is used in the xserver for the parser and in xquartz.
The AX_DEFINE_DIR macro has been removed from the Autoconf Archive.
There are no official providers for this macro anymore.
Separate pre-processor from compiler flags.
XFD_CFLAGS and CWARNFLAGS may contain compiler flags.
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Gaetan Nadon <memsize@videotron.ca>
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