i am trying to install apc on redhat so i did:

pecl install apc

i said yes to:

Use apxs to set compile flags (if using APC with Apache)? [yes]:

and i get this:

checking for re2c... no
configure: WARNING: You will need re2c 0.9.11 or later if you want to \
regenerate PHP parsers.

and

checking whether apc needs to get compiler flags from apxs...

Sorry, I was not able to successfully run APXS.  Possible reasons:

1.  Perl is not installed;
2.  Apache was not compiled with DSO support (--enable-module=so);
3.  'apxs' is not in your path.  Try to use --with-apxs=/path/to/apxs
The output of apxs follows
/tmp/tmpJQuZdD/APC-3.0.16/configure: line 3846: apxs: command not found
configure: error: Aborting
ERROR: `/tmp/tmpJQuZdD/APC-3.0.16/configure --with-apxs' failed

what could be the problem? Thanks