System Requirements
P4PHP is supported on Windows, Linux, FreeBSD, and OS X.
To build P4PHP from source, your development machine must also have:
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PHP 5.3.x, 5.4.x, or 5.5.x.
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The 2014.1 Perforce C/C++ API for your target platform
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The same C++ compiler used to build the Perforce C++ API on your target platform.
(If you get "unresolved symbol" errors when building or running P4PHP, you probably used the wrong compiler or the wrong Perforce API build.)