Failed with lex
configure: warning: You will need bison if you want to regenerate the PHP parsers.
checking for flex... lex
checking for yywrap in -ll... no
checking lex output file root... ./configure: line 2422: lex: command not found
configure: error: cannot find output from lex; giving up
ERROR: Could not configure PHP
What am I missing on my system that causes this installation to fail