Anyone know if there is an easy way to avoid setting CFLAGS and/or 
CPPFLAGS in the MAKE_ENV environment?

I'm trying to track down why I haven't been able to build 
thunderbird/firefox/seamonkey for ages on my solaris-2.9/sparc box via 
pkgsrc.  This mozilla bug report seems to suggest that I might try not 
setting CFLAGS in the make environment.
https://bugzilla.mozilla.org/show_bug.cgi?id=77788

In general I'm wondering if systems that use gnu configure should avoid 
doing this since the configure environment should set them how we want.

Thanks
-Dan