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PHP configuration error

i am having a problemwith installation when it gets to the PHP configuration part. here is the error that i am getting:

Code:

creating cache ./config.cache

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 re2c... exit 0;

checking whether ln -s works... yes

checking for mawk... no

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 parsers.

checking for flex... lex

checking for yywrap in -ll... no

checking lex output file root... ./configure: line 2422: lex: command not found

configure: error: cannot find output from lex; giving up

ERROR: Could not configure PHP

You have to install flex before you install ISPConfig. On Debian you would run

Code:

apt-get install flex

to do so.

ok i got that but now i am getting a new error:

Code:

configure: error: The installed zlib version may contain a security bug. Please upgrade to 1.2.2 or later: http://www.zlib.net. You can omit this check with --disable-zlib-vcheck but DO NOT REPORT any stability issues then!

ERROR: Could not configure ClamAV

do i have to start all over again? because it takes over an hour to install