pthread-stubs is an indirect dependancy of libXcursor

component/xorg/buildout.cfg

@@ -469,7 +469,7 @@ url = http://www.x.org/releases/X11R7.6/src/lib/libXcursor-1.1.11.tar.gz
 md5sum = 55558a41d0bcf9210636858844fa4d2f
 environment =
   PATH=${pkgconfig:location}/bin:%(PATH)s
-  PKG_CONFIG_PATH=${render:location}/lib/pkgconfig:${xproto:location}/lib/pkgconfig:${fixesproto:location}/lib/pkgconfig:${libX11:location}/lib/pkgconfig:${xfixes:location}/lib/pkgconfig:${libXrender:location}/lib/pkgconfig:${kbproto:location}/lib/pkgconfig:${libxcb:location}/lib/pkgconfig
+  PKG_CONFIG_PATH=${render:location}/lib/pkgconfig:${xproto:location}/lib/pkgconfig:${fixesproto:location}/lib/pkgconfig:${libX11:location}/lib/pkgconfig:${xfixes:location}/lib/pkgconfig:${libXrender:location}/lib/pkgconfig:${kbproto:location}/lib/pkgconfig:${libxcb:location}/lib/pkgconfig:${xorg-libpthread-stubs:location}/lib/pkgconfig
   CPPFLAGS=-I${render:location}/include -I${xproto:location}/include -I${fixesproto:location}/include -I${libX11:location}/include -I${xfixes:location}/include -I${libXrender:location}/include
 
 [xwd]