Patch for tcl/tclEnv.c (only needed for single binary version of skycat)
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For the single binary version of skycat (built in the skycat/unexec
dir), the following patch is required (sorry - can't get around it).

In the Tcl-7.4 source directory, after the following declaration,
in tclEnv.c:

static int environSize = 0;	/* Non-zero means that the all of the...

Add this routine:

/*
 * abrighto@eso.org: patch for skycat: I hate to do this, but we just
 * have to reset this static variable or we can't use emacs unexec to
 * generate a single binary. The variable has to be reset to the correct
 * environment size, otherwise it thinks it has the environment it was
 * compiled/created with...
 */
void TclResetEnvironSize(int size)
{
    environSize = size;
}