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(kpathsea.info)dlopen

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`dlopen'
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  (This section adapted from the file `dlsym.c' in the X distribution.)

  The `Xlib' library uses the standard C function `wcstombs'.  Under
SunOS 4.1, `wcstombs' uses the `dlsym' interface defined in `libdl.so'.
Unfortunately, the SunOS 4.1 distribution does not include a static
`libdl.a' library.

  As a result, if you try to link an X program statically under SunOS,
you may get undefined references to `dlopen', `dlsym', and `dlclose'.
One workaround is to include these definitions when you link:

     void *dlopen() { return 0; }
     void *dlsym()  { return 0; }
     int dlclose()  { return -1; }

These are contained in the `dlsym.c' file in the MIT X distribution.