[Ur] problems building Ur/Web on OS X since the change to dynamic so libs

[Adam Chlipala]

Georg Bauer wrote:
>> I don't know anything about the OSX development environment.  I'll be happy
>> to accept any patch someone provides.
>>      
> I think the right way to go would be to use GNU libtool - and go the
> full automake+autoconf route, dynamic libraries for all supported
> plattforms are an automatic result. But please don't look at me on how
> to use libtool - that stuff allways drives me crazy ;)
>    

The libtool manual seems to be pretty readable.  Based on its examples, 
I've modified the Ur/Web Makefile to use libtool.  What I have now works 
in Debian, but I haven't tried it in any other setting.  Could you give 
it a try in OSX and let me know if it works?  It can be pulled from this 
Mercurial repository:
     http://hg.impredicative.com/urweb