On mac and linux machines there should not be a requirement to install any prerequisites. In general the build requires gcc being installed.
On Windows machines, you might need to install it manually. He have tested everything with the bundle of http://win-builds.org/doku.php/download_and_installation_from_windows Make sure the bin directory containing the executable mingw32-make.exe is on your systems PATH.
In the plc4cpp-libs module all third party dependencies will be built that are needed by any of the other plc4cpp modules. The build is setup to install any built binaries to the libs directory of the plc4cpp-libs module and to only build them if they have previously not been installed there. So please refer to that directory in any of the other builds.