SPARC 5 running Solaris 2.3 using Open Windows installs correctly. However, executing WFCMGR produces LibXm.so.3 cannot open file.
Supported versions of Solaris include 2.5.1 and above. Previous versions of Solaris did not include Motif as part of the package. The Solaris ICA client requires those Motif-shared libraries. The best solution is to upgrade the version of Solaris.