Problems on install php 5 on Fedora 4

[magic003]

Hi, I am trying to install php5 on my Fedora system.
I have install Apache 2 successfully. And I can see the success page through http://localhost.
I downloaded the source code for php5. But, when I do the configuration task:

./configure --prefix=/opt/php5 --with-apxs2=/opt/Apache2/bin/apxs --with-mysql=/opt/mysql-5.0

I encountered such message:

checking for flex... lex
checking for yywrap in -11... no
checking lex output file root... ./configure: line 3246: lex: command not found
configure: error: cannot find output from lex: giving up

what's wrong with? How can I solve it? Please help me. Thank you!

[magic003]

Oh, I solved the problem. It is because the flex package is not available.

But now, there is another poblem:

checking for xml2-config path...
configure: error: xml2-config not found. Please check your libxml2 installation.

[magic003]

It is ok now. I lost the libxml2-devel package