Scm_MakeVirtualPort  395 ext/vport/vport.c     port = Scm_MakeVirtualPort(klass, dir, &vtab);
Scm_MakeVirtualPort 1484 src/gauche.h   SCM_EXTERN ScmObj Scm_MakeVirtualPort(ScmClass *klass,
Scm_MakeVirtualPort  330 src/write.c        port = SCM_PORT(Scm_MakeVirtualPort(SCM_CLASS_PORT, SCM_PORT_OUTPUT,