+XCB_CHECK_VISIBILITY()
+
+# htmldir is not defined prior to autoconf 2.59c, so on earlier versions
+# set an equivalent value.
+AC_PREREQ([2.59c], [], [AC_SUBST([htmldir], [m4_ifset([AC_PACKAGE_TARNAME],
+ ['${datadir}/doc/${PACKAGE_TARNAME}'],
+ ['${datadir}/doc/${PACKAGE}'])
+])])
+
+XCB_CHECK_DOXYGEN()
+
+AC_CHECK_FUNC(getaddrinfo, [AC_DEFINE(HAVE_GETADDRINFO, 1, [getaddrinfo() function is available])], )
+
+case $host_os in
+ # darwin through Snow Leopard has poll() but can't be used to poll character devices.
+ darwin@<:@789@:>@*|darwin10*) ;;
+ darwin*)
+ _ac_xorg_macosx_version_min=""
+ if echo $CPPFLAGS $CFLAGS | grep -q mmacosx-version-min ; then
+ _ac_xorg_macosx_version_min=`echo $CPPFLAGS $CFLAGS | sed 's/^.*-mmacosx-version-min=\(@<:@^ @:>@*\).*$/\1/'`
+ else
+ _ac_xorg_macosx_version_min=$MACOSX_DEPLOYMENT_TARGET
+ fi
+ case $_ac_xorg_macosx_version_min in
+ 10.@<:@0123456@:>@|10.@<:@0123456@:>@.*) ;;
+ *)
+ AC_CHECK_FUNC(poll, [AC_DEFINE(USE_POLL, 1, [poll() function is available])], )
+ ;;
+ esac
+ unset _ac_xorg_macosx_version_min
+ ;;
+ *)
+ AC_CHECK_FUNC(poll, [AC_DEFINE(USE_POLL, 1, [poll() function is available])], )
+ ;;
+esac
+
+XCB_EXTENSION(Composite, "yes")
+XCB_EXTENSION(Damage, "yes")
+XCB_EXTENSION(DPMS, "yes")
+XCB_EXTENSION(DRI2, "yes")
+XCB_EXTENSION(GLX, "yes")
+XCB_EXTENSION(RandR, "yes")
+XCB_EXTENSION(Record, "yes")
+XCB_EXTENSION(Render, "yes")
+XCB_EXTENSION(Resource, "yes")
+XCB_EXTENSION(Screensaver, "yes")
+XCB_EXTENSION(Shape, "yes")
+XCB_EXTENSION(Shm, "yes")
+XCB_EXTENSION(Sync, "yes")
+XCB_EXTENSION(Xevie, "yes")
+XCB_EXTENSION(XFixes, "yes")
+XCB_EXTENSION(XFree86-DRI, "yes")
+XCB_EXTENSION(Xinerama, "yes")
+XCB_EXTENSION(XInput, "no")
+XCB_EXTENSION(XKB, "no")
+XCB_EXTENSION(Xprint, "yes")
+XCB_EXTENSION(SELinux, "no")
+XCB_EXTENSION(XTest, "yes")
+XCB_EXTENSION(Xv, "yes")
+XCB_EXTENSION(XvMC, "yes")