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`ShellWidgetClass'
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  (This section adapted from the comp.sys.sun.admin FAQ.)

  If you are linking with Sun's OpenWindows libraries in SunOS 4.1.x,
you may get undefined symbols `_get_wmShellWidgetClass' and
`_get_applicationShellWidgetClass' when linking. This problem does not
arise using the standard MIT X libraries under SunOS.

  The cause is bugs in the `Xmu' shared library as shipped from Sun.
There are several fixes:

   * Install the free MIT distribution from `ftp.x.org' and mirrors.

   * Get the OpenWindows patches listed below.

   * Statically link the `Xmu' library into the executable.

   * Avoid using `Xmu' at all. If you are compiling Metafont, see Note:
     Online Metafont graphics. If you
     are compiling Xdvi, see the `-DNOTOOL' option in `xdvik/INSTALL'.

   * Ignore the errors. The binary runs fine regardless.


  Here is the information for getting the two patches:

     Patch ID: 100512-02
     Bug ID's: 1086793, 1086912, 1074766
     Description: 4.1.x OpenWindows 3.0 `libXt' jumbo patch
     
     Patch ID: 100573-03
     Bug ID: 1087332
     Description: 4.1.x OpenWindows 3.0 undefined symbols when using shared `libXmu'.

  The way to statically link with `libXmu' depends on whether you are
using a Sun compiler (e.g., `cc') or `gcc'. If the latter, alter the
`x_libs' Make variable to include

     -static -lXmu -dynamic

  If you are using the Sun compiler, use `-Bstatic' and `-Bdynamic'.