doc: add XORG_CHECK_SGML_DOCTOOLS to detect xorg-sgml-doctools

Trying to find X11/defs.ent with AC_CHECK_FILE does not work when
cross-compiling, and the check assumed that xorg-sgml-doctools is
installed to the same prefix which need not always be the case.

xorg-sgml-doctools 1.4 provides a pkg-config file which we can use
instead, fixing both those cases.  This macro is provided in util-macros
instead of with xorg-sgml-doctools, otherwise the latter would become a
hard dependency just to run autoreconf.

Signed-off-by: Yaakov Selkowitz <yselkowitz@users.sourceforge.net>
Reviewed-by: Gaetan Nadon <memsize@videotron.ca>

0 files changed, 0 insertions, 0 deletions