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## Requirements

The following elements are required to compile ClamAV:

- zlib and zlib-devel packages
- gcc compiler suite (both 2.9x and 3.x are supported)

The following packages are optional but highly recommended:

- bzip2 and bzip2-devel library
- GNU MP 3
  It's very important to install the GMP package because it allows `freshclam` to verify the digital signatures of the virus databases. If freshclam was compiled without GMP support it will display "SECURITY WARNING: NO SUPPORT FOR DIGITAL SIGNATURES" on every update. You can download GNU MP at `http://www.swox.com/gmp/`
  A note for Solaris/SPARC users: you must set the ABI system variable to 32 (e.g. `setenv ABI 32`) before running the configuration script of GMP.