Building 2.5.20

[Jonatan Liljedahl]

I've just downloaded 2.5.20 and am trying to build it. 
It bails out on out/lexer.cc with:

out/lexer.cc: In member function `virtual int Lily_lexer::yylex()':
out/lexer.cc:3331: error: `yy_current_buffer' undeclared (first use this

   function)

I can see that the configure scripts checks for yy_current_buffer and
says "no".

This was no problem with 2.5.18.

I'm using Flex 2.5.31.

/Jonatan    -=( http://kymatica.com )=-