Something

mged> rtedge havoc
BRL-CAD Release 7.8.4   RT LGT-Style Hidden-Line Renderer
    Wed Feb 21 19:37:48 EST 2007, Compilation 23
    IriX64@FthrNtr:/home/IriX64/brlcad-7.8.4/src/rt
BRL-CAD Release 7.8.4   The BRL-CAD Ray-Tracing Library
    Wed Feb 21 19:22:53 EST 2007, Compilation 12
    IriX64@FthrNtr:/home/IriX64/brlcad-7.8.4/src/librt
BRL-CAD Release 7.8.4   The BRL-CAD Numerical Computation Library
    Wed Feb 21 19:21:56 EST 2007, Compilation 2
    IriX64@FthrNtr:/home/IriX64/brlcad-7.8.4/src/libbn
BRL-CAD Release 7.8.4   The BRL-CAD Utility Library
    Wed Feb 21 19:20:19 EST 2007, Compilation 2
    IriX64@FthrNtr:/home/IriX64/brlcad-7.8.4/src/libbu

WARNING: Compile-time debugging is enabled and may limit performance
Running on FthrNtr
/usr/cygcad/bin/rtedge -M
opendb havoc;
tree /usr/cygcad/share/db/havoc.g;
rt:  rt_dirbuild(havoc) failure
Raytrace complete.
mged>