AFAIK, it should work (except for the fact that there is no /usr/bin/php) Error: bash: /usr/bin/pear: /usr/bin/php: bad interpreter: No such file or directory
mhm, okay, should have done more research.... /usr/bin/php is created when php is compiled as CGI (and maybe with CLI?). Pity, 'pear' seems useful.
Look into dev-php/php Roman
Try "emerge dev-php/php", although you'll have to unmask it first. I believe that dev-php/php is the cli/cgi version, and dev-php/mod_php is the apache mod. Bouncing to rphillips@gentoo.org for confirmation.
Grant has it exactly right.