Add AC_USE_SYSTEM_EXTENSIONS providing needed WTMPX_FILE define

The WTMPX_FILE is only defined under __USE_GNU conditional
compilation. Autoconf provides AC_USE_SYSTEM_EXTENSIONS
to enable platform extensions.

It must be expanded before any other macros that uses the compiler.
To reduce the risk of being misplaced, the statements have been
grouped (mostly) as per the GNU standard layout.This macro
requires Autoconf level 2.60 or later.

The compilation failed under a GNU-Linux OS.

Tested-by (on darwin): Jeremy Huddleston <jeremyhu@apple.com>
Signed-off-by: Gaetan Nadon <memsize@videotron.ca>

0 files changed, 0 insertions, 0 deletions