Configure script completes successfully, however when I do a make I find out that subdirectory libzend contains no Makefile and aborts.  Looking into config.log in libzend dir, I find that the problem is that I do not have flex installed and configure defaults to -ll which I am assuming is the lib for lex which does not exist either.  This causes the libzend configure script to bomb out without creating a Makefile.  I would think the main configure script should abort at this time and tell the user that neither flex nor lex is installed.