~/ntl-11.4.2/doc/version.cpp.html

    /**************************************************************************\

    MODULE: version

    SUMMARY:

    Macros defining the NTL version number.

    \**************************************************************************/

    #define NTL_VERSION        ... // version number as a string, e.g., "5.2"

    #define NTL_MAJOR_VERSION  ... // e.g., 5 in the above example
    #define NTL_MINOR_VERSION  ... // e.g., 2        "
    #define NTL_REVISION       ... // e.g., 0        "

    // The choice as to whether a new version warrants a higher
    // Major version number or Minor version number is fairly subjective,
    // with no particular rule.

    // Revision numbers are only used for small bug fixes that generally
    // do not affect the programming interface at all.