-single_module flag on Darwin

[Sushil Kambampati]

I could compile and link to a somewhat older version of InterViews using 
libtool 1.4.2 but with version 1.5 of libtool the -single_module flag is 
activated by default and now I cannot link against InterViews libraries, I 
get an error from ld "multiple definitions of symbol".  The class PSFont is 
the culprit.

When I go into libtool and rip out the -single_module flag then the 
executable links again.

Why was -single_module made the default and what is the proper way of 
dealing with this issue?  I admit I know next to nothing about the GNU build 
utils.

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