splitPtr = Tcl_FSSplitPath(objv[1], &pElements);
		Tcl_ListObjIndex(NULL, splitPtr, pElements -1, &pkgGuessPtr);
		pkgGuess = Tcl_GetString(pkgGuessPtr);
		if ((pkgGuess[0] == 'l') && (pkgGuess[1] == 'i')
			&& (pkgGuess[2] == 'b')) {
		    pkgGuess += 3;
		}
#ifdef __CYGWIN__
		if ((pkgGuess[0] == 'c') && (pkgGuess[1] == 'y')
			&& (pkgGuess[2] == 'g')) {
		    pkgGuess += 3;
		}
#endif /* __CYGWIN__ */
		for (p = pkgGuess; *p != 0; p += offset) {
		    offset = Tcl_UtfToUniChar(p, &ch);
		    if ((ch > 0x100)
			    || !(isalpha(UCHAR(ch)) /* INTL: ISO only */
				    || (UCHAR(ch) == '_'))) {
			break;
		    }