use make variables to allow cc/yacc/lex replacement
use make variables to allow cc/yacc/lex replacement

davydovanton/streem,pze/streem,VorontsovIE/streem,davydovanton/streem,mattn/streem,pze/streem,matz/streem,VorontsovIE/streem,pze/streem,0x00evil/streem,Ye-Yong-Chi/streem,mattn/streem,0x00evil/streem,suzukaze/streem,lvfeng1130/streem,suzukaze/streem,davydovanton/streem,ShigeruIchinoki/streem,Ye-Yong-Chi/streem,Ye-Yong-Chi/streem,VorontsovIE/streem,mattn/streem,lvfeng1130/streem,matz/streem,ShigeruIchinoki/streem,davydovanton/streem,suzukaze/streem,xczswt1993/streem,xczswt1993/streem,ShigeruIchinoki/streem,lvfeng1130/streem,Ye-Yong-Chi/streem,0x00evil/streem,suzukaze/streem,pze/streem,0x00evil/streem,lvfeng1130/streem,ShigeruIchinoki/streem,VorontsovIE/streem