aptitude install php5-phalcon
The following NEW packages will be installed:
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The following packages have unmet dependencies:
php5-phalcon: Depends: phpapi-20100525 which is a virtual package.
The following actions will resolve these dependencies:
Keep the following packages at their current version:
1) php5-phalcon [Not Installed]
Accept this solution? [Y/n/q/?] y
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
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I install from github and it works pretty easily. Initially I tried to install from that repo and had some problems - I can't remember what they were at the time, but they were enough to make me compile from source.