Workaround an xcb-dri2 bug.
xcb_dri2_connect_device_name generated by xcb-proto 1.6 is broken. It
only works when the length of the driver name is a multiple of 4.
diff --git a/configure.ac b/configure.ac
index b510b51..f57e2bd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -34,6 +34,11 @@
[AC_MSG_ERROR([Can't find expat library. Please install expat.])])
AC_SUBST(EXPAT_LIBS)
+# workaround a bug in xcb-dri2 generated by xcb-proto 1.6
+AC_CHECK_LIB(xcb-dri2, xcb_dri2_connect_alignment_pad, [],
+ [AC_DEFINE([XCB_DRI2_CONNECT_DEVICE_NAME_BROKEN], [1],
+ [Define to 1 if xcb_dri2_connect_device_name is broken])])
+
AC_CONFIG_FILES([wayland/wayland-server.pc
wayland/wayland-client.pc
Makefile