kompilacia php

[c0re]

 zdravim. potreboval by som trosku nasmerovat.
chcem si skompilovat php, ale mam tam chybu.
vie mi niekto poradit? dakujem.
 
 [root na veaux php-4.3.4]#
 ./configure --with-mysql --with-apache=../apache_1.3.26
 loading cache ./config.cache
 checking host system type... i586-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 re2c... exit 0;
 checking for ranlib... ranlib
 checking whether ln -s works... yes
 checking for gawk... gawk
 checking for bison... bison -y
 checking bison version... 1.28 (ok)
 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