Recently I updated from Wnn 4.2 to FreeWnn 1.1.1. Then include files
${LOCALBASE}/include/wnn/*.h and a archive librarry libwnn.a of FreeWnn
conflict with ones of Wnn6-lib. So I move Wnn6-lib's include files into
${LOCALBASE}/include/wnn6/wnn and remove libwnn.a of Wnn6-lib. Note that
libwnn6.a can be used instead of libwnn.a for Wnn6-lib.