求助：php5.16安装失败

beishanfengyun

系统是FC5
mysql是5.0.24a
apache是2.0.59
mysql ,apache都可以运行
安装php5出现以下信息：
[root@localhost php-5.1.6]# ./configure --with-apxs2=/usr/local/apache2/bin/apxs --with-mysql
loading cache ./config.cache
checking for Cygwin environment... no
checking for mingw32 environment... no
checking for egrep... grep -E
checking for a sed that does not truncate output... /bin/sed
checking host system type... i686-pc-linux-gnu
checking target system type... i686-pc-linux-gnu
checking for gcc... gcc
checking whether the C compiler (gcc  ) works... yes
checking whether the C compiler (gcc  ) is a cross-compiler... no
checking whether we are using GNU C... yes
checking whether gcc accepts -g... yes
checking whether gcc and cc understand -c and -o together... yes
checking how to run the C preprocessor... gcc -E
checking for AIX... no
checking whether ln -s works... yes
checking if compiler supports -R... no
checking if compiler supports -Wl,-rpath,... yes
checking for re2c... no
configure: warning: You will need re2c 0.9.11 or later if you want to regenerate PHP parsers.
checking for gawk... gawk
checking for bison... bison -y
checking for bison version... 2.1 (ok)
checking for flex... lex
checking for yywrap in -ll... no
checking lex output file root... ./configure: line 3246: lex: command not found
configure: error: cannot find output from lex; giving up
[root@localhost php-5.1.6]#

到这就装不了了，到百度搜re2c ，搜不出答案，该怎么办？会的教下，谢谢！还有改成./configure --with-apxs2=/usr/local/apache2/bin/apxs  --with-mysql=/usr/local/mysql/ 也不行。

OneZ

checking lex output file root... ./configure: line 3246: lex: command not found
configure: error: cannot find output from lex; giving up

最后这两行，显示lex没有安装。可以解释的理由是，PHP的编译，依赖于lex，而它又不在你的系统里。

对于FC5，建议你使用系统所提供的包安装方式，进行软件安装。自己编译，固然可以实现定制、优化，但软件的依赖关系(编译时的依赖关系、运行时的依赖关系)，在不熟悉的情况下，要化不少时间去解决。