[GRASS5] [bug #3106] (grass) new nviz flythrough uses math not in default darwin math libs

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this bug's URL: http://intevation.de/rt/webrt?serial_num=3106
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Subject: new nviz flythrough uses math not in default darwin math libs

Platform: Mac OSX
grass obtained from: Trento Italy site
grass binary for platform: Compiled from Sources
GRASS Version: 6.1 cvs

On Darwin (Mac OS X) libmath funtions are in the System framework.  This is found OK in configure, 
and MATHLIB is set to empty.  However, the nviz flythrough uses some float functions not found 
there, but in libmx.  For nviz to compile now, -lmx must be added to MATHLIB for the Darwin 
configure somehow.

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