Index: Portfile
===================================================================
--- Portfile	(revision 66169)
+++ Portfile	(working copy)
@@ -19,6 +19,7 @@
 depends_lib         port:ocaml
 build.target        lib libopt glut glutopt
 use_parallel_build  no
+worksrcdir          lablGL-${version}
 
 livecheck.type      regex
 livecheck.url       http://wwwfun.kurims.kyoto-u.ac.jp/soft/olabl/lablgl.html