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dnl Even packages that don't use regex.c can use this macro.
dnl Of course, for them it doesn't do anything.
dnl Derived from code in GNU grep.
dnl Derived from code in GNU fileutils ;-).
AC_DEFUN(AM_INCLUDED_REGEX,
[AC_REQUIRE([AM_GLIBC])
AC_CACHE_CHECK([whether compiling regex.c], ac_cv_included_regex,
[
# By default, don't use the included regex.c on systems with glibc 2
if test x"$ac_cv_glibc" = xyes ; then
default=no
else
default=yes
fi
AC_ARG_WITH(included-regex,
[ --without-included-regex don't compile regex; this is the default on
systems with version 2 of the GNU C library
(use with caution on other system)],
ac_cv_included_regex=$withval,
ac_cv_included_regex=$default)
if test x"$ac_cv_included_regex" = xyes; then
LIBOBJS="$LIBOBJS regex.${ac_objext}"
fi
])])
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