[Bug-apl] accepting portability patches?

[Juergen Sauermann]

Hi Doug,

yes, please send the patches. I can check that they compile
but I don't have a non-GNU/Linux system at hand.

So it would be great if you could check if the changes work on your box.

I have compiled GNU APL on CYGWIN and I have noticed some problems
with function backtrace() which is a GNU extension. I have disabled calls to
backtrace() when it is not available, but maybe there is a different 
function
doing the trick?

⍝ Jürgen