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dnl Available from the GNU Autoconf Macro Archive at:
dnl http://www.gnu.org/software/ac-archive/htmldoc/adl_func_getopt_long.html
dnl
AC_DEFUN([adl_FUNC_GETOPT_LONG],
[AC_PREREQ(2.49)dnl
# clean out junk possibly left behind by a previous configuration
rm -f lib/getopt.h
# Check for getopt_long support
AC_CHECK_HEADERS([getopt.h])
AC_CHECK_FUNCS([getopt_long],,
[# FreeBSD has a gnugetopt library for this
AC_CHECK_LIB([gnugetopt],[getopt_long],[AC_DEFINE([HAVE_GETOPT_LONG])],
[# use the GNU replacement
AC_LIBOBJ(getopt)
AC_LIBOBJ(getopt1)
AC_CONFIG_LINKS([ggsn/getopt.h:ggsn/gnugetopt.h])
AC_CONFIG_LINKS([sgsnemu/getopt.h:sgsnemu/gnugetopt.h])])])])
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