pecl install help. New here

New here so pardon me while I learn the ropes.

Question on pecl installs

I have 2 instances of php on the system. One the system default and one with a different config.

I tried 

/usr/local/php5/bin/pecl install mailparse

to install mailparse. It did but it installed it to the other instance's structure:

/usr/lib/php/extensions/no-debug-non-zts-20020429/mailparse.so

instead of 

/usr/local/php5/lib/php/extensions/no-debug-non-zts-20060613/mailparse.so

which is also the directory which is returned from

/usr/local/php5/bin/php-config

So my question is how do I tell /usr/local/php5/bin/pecl or /usr/local/php5/bin/phpize to use the correct directoies to compile and the store the libraries.

Thanks for you help,

Tom