SIR_VERSION_IS_RELEASE  268 src/libsir/src/sir.c     return (!SIR_VERSION_IS_RELEASE);
SIR_VERSION_IS_RELEASE 4795 src/simh/scp.c                    SIR_VERSION_SUFFIX, SIR_VERSION_IS_RELEASE ? " (release)" : "",
SIR_VERSION_IS_RELEASE 4796 src/simh/scp.c                    sir_getversionstring(), SIR_VERSION_IS_RELEASE ? "" : sir_isprerelease() ? "" : " (release)");