帮我看一下，安装PHP时出现的错误信息，要什么环境啊？

[weixin_38060280]

[root@fxj php-4.3.1]#  ./configure --prefix=/usr/local/php4.3.1 --with-apxs2=/usr/local/apache/bin/apxs --enable-track-vars --with-mysql --with-mssql --with-config-file-path=/usr/local/lib --with-openssl=/usr/local/openssl --enable-bcmath
loading cache ./config.cache
checking for Cygwin environment... no
checking for mingw32 environment... no
checking for working sed... sed
checking host 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 if compiler supports -R... no
checking if compiler supports -Wl,-rpath,... yes
checking for ranlib... ranlib
checking whether ln -s works... yes
checking for gawk... gawk
checking for bison... no
checking for byacc... no
configure: warning: You will need bison if you want to regenerate the PHP parser
s.
checking for flex... lex
checking for yywrap in -ll... no
checking lex output file root... ./configure: line 2482: lex: command not found
configure: error: cannot find output from lex; giving up
还要安装什么包啊？