How does the pear installer tell when a php_mode isn't installed?

From: Date: Tue, 15 Apr 2003 07:07:50 +0000
Subject: How does the pear installer tell when a php_mode isn't installed?
Groups: php.pear.general 
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I just tried to install Image_Color and it failed with gd not installed error yet the gd module is installed and working, how does pear tell if a package is installed? Thanks

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