Specifies what compiler family will be used (for example, vc_6_0, vc_7_0, vc_7_1, vc_8_0, gcc_2_9, gcc_3_2, gcc_3_3, gcc_3_4, ghs_4_0). For a custom compiler, you need to use the custom compiler family identifier, which is the name of the directory containing gui.properties, c.psrc and cpp.psrc files). If this property is not specified, the default values will be used.