known installation problems: 
----------------------------
- with OSF1 on DEC Alpha.
   The STk-3.99.4 function "exec" is broken. 
   FIX: apply the patch PATH-OSF-STK-3.99.4

   Apply PATH-OSF-STK-3.99.4 to STk
   STj should be compiled

- with  STk-3.99.3:

   Using STk rpm: missing link /usr/local/lib/stk/include and files 
   tk.h and tkInt.h
   FIX: install STk from source code 

   Using STk Source code: tk.h is missing in {prefix}/lib/stk/include
   FIX: cp {prefix}/lib/stk/8.0/include/tk.h {prefix}/lib/stk/include/

- with lib5c

Problem loading libxxl.so when xxl starts (unresolved symbols). You have
upgraded to lib6c (glibc), but your STk had been compiled under lib5c.
FIX:  recompile STk  using libc6 

- SunOS helios 5.6

   xxl does not compile with yacc and lex.
   FIX: install and use flex and bison
