+# Version
+m4_define(hb_version_triplet,m4_split(AC_PACKAGE_VERSION,[[.]]))
+m4_define(hb_version_major,m4_argn(1,hb_version_triplet))
+m4_define(hb_version_minor,m4_argn(2,hb_version_triplet))
+m4_define(hb_version_micro,m4_argn(3,hb_version_triplet))
+HB_VERSION_MAJOR=hb_version_major
+HB_VERSION_MINOR=hb_version_minor
+HB_VERSION_MICRO=hb_version_micro
+HB_VERSION=AC_PACKAGE_VERSION
+AC_SUBST(HB_VERSION_MAJOR)
+AC_SUBST(HB_VERSION_MINOR)
+AC_SUBST(HB_VERSION_MICRO)
+AC_SUBST(HB_VERSION)
+
+# Libtool version
+m4_define([hb_version_int],
+ m4_eval(hb_version_major*10000 + hb_version_minor*100 + hb_version_micro))
+m4_if(m4_eval(hb_version_minor % 2), [1],
+ dnl for unstable releases
+ [m4_define([hb_libtool_revision], 0)],
+ dnl for stable releases
+ [m4_define([hb_libtool_revision], hb_version_micro)])
+m4_define([hb_libtool_age],
+ m4_eval(hb_version_int - hb_libtool_revision))
+m4_define([hb_libtool_current],
+ m4_eval(hb_version_major + hb_libtool_age))
+HB_LIBTOOL_VERSION_INFO=hb_libtool_current:hb_libtool_revision:hb_libtool_age
+AC_SUBST(HB_LIBTOOL_VERSION_INFO)
+
+dnl GTK_DOC_CHECK([1.15],[--flavour no-tmpl])
+
+# Functions and headers
+AC_CHECK_FUNCS(atexit mprotect sysconf getpagesize sched_yield mmap _setmode isatty)
+AC_CHECK_HEADERS(unistd.h sys/mman.h sched.h io.h)