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Why does GCC ignore ARCHFLAGS in Snow Leopard?

I am trying to set AMFAST to virtual_env based on a dependency file. I have export ARCHFLAGS="-arch x86_64"in my local .profile and confirmed its presence by running envand seeing it in the list. However, whenever I start PIP, focusing on the virtual environment, gcc is configured for i386 and ppc. I also tried to add commands env ARCHFLAGS="-arch i386 -arch x86_64"and env ARCHFLAGS="-arch x86_64"to the PIP team, but always has a gcc flags -arch i386 -arch ppc -arch x86_64. How can I get gcc to read my flags?

example:

sudo pip install -E ~/Documents/project/project_env -r ~/Documents/project/trunk/django/dependencies.txt`

way out
...

Running setup.py install for amfast  
  building 'amfast.encode' extension  
  gcc-4.2 -fno-strict-aliasing -fno-common -dynamic -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -arch i386 -arch ppc -arch x86_64 -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6 -c amfast/ext_src/encoder.c -o build/temp.macosx-10.6-universal-2.6/amfast/ext_src/encoder.o
  /usr/libexec/gcc/powerpc-apple-darwin10/4.2.1/as: assembler (/usr/bin/../libexec/gcc/darwin/ppc/as or /usr/bin/../local/libexec/gcc/darwin/ppc/as) for architecture ppc not installed
  Installed assemblers are:
  /usr/bin/../libexec/gcc/darwin/x86_64/as for architecture x86_64
  /usr/bin/../libexec/gcc/darwin/i386/as for architecture i386
  amfast/ext_src/encoder.c:2121: fatal error: error writing to -: Broken pipe
  compilation terminated.
  lipo: can't open input file: /var/tmp//ccoYlfhN.out (No such file or directory)
  error: command 'gcc-4.2' failed with exit status 1
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1 answer

, , ARCHFLAGS sudo. sudo env (. man sudo). :

sudo ARCHFLAGS="-arch x86_64" pip install -E ~/Documents/project/project_env -r ~/Documents/project/trunk/django/dependencies.txt`
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