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This error occurs when attempting to start ArcInfo:
ld.so.1: /esri/arcexe81/bin/arc: fatal: libXm.so.4: open failed: No such file or directory
Sun OS 5.6 (Solaris 2.6) is not supported for ArcInfo 8.1 Workstation.
Make sure your operating system level is Solaris 7 or Solaris 8.
For information on system requirements, see the link below.