どうもこれらしいですよ
Index: Makefile
===================================================================
RCS file: /e/cvsync/cvsync/pkgsrc/x11/xf86-input-mouse/Makefile,v
retrieving revision 1.12
diff -u -r1.12 Makefile
@@ -21,5 +20,6 @@
.include "../../x11/kbproto/buildlink3.mk"
.include "../../x11/xproto/buildlink3.mk"
.include "../../x11/modular-xorg-server/buildlink3.mk"
+.include "../../x11/xineramaproto/buildlink3.mk"

.include "../../mk/bsd.pkg.mk"