dnl From Jim Meyering.
dnl FIXME: migrate into libit.

AC_DEFUN([AM_FUNC_OBSTACK],
[AC_CACHE_CHECK([for obstacks], am_cv_func_obstack,
 [AC_TRY_LINK([#include "obstack.h"],
	      [struct obstack *mem;obstack_free(mem,(char *) 0)],
	      am_cv_func_obstack=yes,
	      am_cv_func_obstack=no)])
 if test $am_cv_func_obstack = yes; then
   AC_DEFINE(HAVE_OBSTACK,1,[Define if libc includes obstacks])
 else
   LIBOBJS="$LIBOBJS obstack.o"
 fi
])