Getting magick to compile on AIX with xlC and xlc

There are a couple of nasty errors you can get when compiling  
ImageMagick.
One of them is the dreaded:
"Macro name blahblahblah cannot be redefined."
This is fixed by appending the following to the CFLAGS and CXXFLAGS:
-qlanglevel=extended

Also, you might get an error due to the use of C++-style comments in  
straight C files.  Gnu compilers (gcc) allow this, and xlc does not.   
But you can permit it by adding this to CFLAGS:
-qcpluscmt

Hope this helps someone.  It took me a while to figure out.  I also  
hope this shows up on the web for googlers.  :-)

I'm not done compiling yet, but wanted to send this out to help.
-- 
✐Richard Cook
✇ Lawrence Livermore National Laboratory
Bldg-453 Rm-4037, Mail Stop L-557
7000 East Avenue,  Livermore, CA, 94550, USA
☎ (office) (925) 423-9605
☎ (fax) (925) 423-6961
---
Information Management & Graphics Grp., Services & Development Div.,  
Integrated Computing & Communications Dept.
(opinions expressed herein are mine and not those of LLNL)