Problems compiling php4.2.1 (lex command not found)

Hi there, I did recently compile php4.2.0 and it worked fine. Now I did download 4.2.1 and used the same configure command (still in the cache) to configure the new php code. This are the errors I did get: checking for bison... no checking for byacc... no 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: lex: command not found configure: error: cannot find output from lex; giving up root@saratoga:/home/andy/sw/php-4.2.1 > ./configure --with-gd=/home/andy/sw/gd-2.0.1 --with-freetype-dir=/usr/ --ena ble-gd-native-ttf --enable-gd-imgstrttf --with-jpeg-dir=/usr --with-png-dir= /usr --with-zlib --with-apxs=/usr/local/apache/bin/apxs --with-ftp --with-my sql --with-pdflib The machine is a suse7.2 linux system. No changes since last install (last weekend :-) Thanx for your help guys! Andy