LinuxQuestions.org - Compiing php 5 Lex: command not found

I'm trying to get php5 to work on suse 10.

When compiling I get the message LEX: command not found.

Am I missing some tools.

Here's the log

blackdog:/mydata/php5/php-5.1.2 # ./configure --prefix=/usr/local/php5\
> --with-apxs2=/usr/local/apache2/bin/apxs\
> --with-libxml-dir=/usr/local/lib --with-zlib\
> --with-zlib-dir=/usr/local/lib \
> --with-mysqli=/usr/bin/mysql_config\
> --with-gd --enable-soap --enable-sockets \
> --with-jpeg-dir=/usr --enable-exif
creating 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... /usr/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... no
checking for byacc... no
checking for bison version... invalid
configure: warning: bison versions supported for regeneration of the Zend/PHP pa rsers: 1.28 1.35 1.75 1.875 2.0 2.1 (found: none).
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
blackdog:/mydata/php5/php-5.1.2 #

I don't want to go back to php4.

Mysql V5 and apache 2 are both working perfectly.

Thanks

Cheers

-K