Hi I am trying to do a cross platform build of numpy (host=x86 target=ppc). This worked for python compiler itself but for numpy I run into following problem. It does select the correct compiler but the options are not correct. please advise...  numpy-1.10.2rc2]$ CC=powerpc-e500v2-linux-gnuspe-gcc CXX=powerpc-e500v2-linux-gnuspe-g++ AR=powerpc-e500v2-linux-gnuspe-ar                            BLAS=None LAPACK=None ATLAS=None  python setup.py build  bdist_egg   --plat-name=powerpc powerpc-e500v2-linux-gnuspe-gcc: _configtest.c powerpc-e500v2-linux-gnuspe-gcc: error: unrecognized argument in option '-mtune=generic' powerpc-e500v2-linux-gnuspe-gcc: note: valid arguments to '-mtune=' are: 401 403 405 405fp 440 440fp 464 464fp 476 476fp 505 601 602 603 603e 604 604e 620 630 740 7400 7450 750 801 821 823 8540 8548 860 970 G3 G4 G5 a2 cell common e300c2 e300c3 e500mc e500mc64 ec603e native power power2 power3 power4 power5 power5+ power6 power6x power7 powerpc powerpc64 rios rios1 rios2 rs64 rsc rsc1 titan powerpc-e500v2-linux-gnuspe-gcc: error: unrecognized argument in option '-mtune=generic' powerpc-e500v2-linux-gnuspe-gcc: note: valid arguments to '-mtune=' are: 401 403 405 405fp 440 440fp 464 464fp 476 476fp 505 601 602 603 603e 604 604e 620 630 740 7400 7450 750 801 821 823 8540 8548 860 970 G3 G4 G5 a2 cell common e300c2 e300c3 e500mc e500mc64 ec603e native power power2 power3 power4 power5 power5+ power6 power6x power7 powerpc powerpc64 rios rios1 rios2 rs64 rsc rsc1 titan powerpc-e500v2-linux-gnuspe-gcc: error: unrecognized argument in option '-mtune=generic' powerpc-e500v2-linux-gnuspe-gcc: note: valid arguments to '-mtune=' are: 401 403 405 405fp 440 440fp 464 464fp 476 476fp 505 601 602 603 603e 604 604e 620 630 740 7400 7450 750 801 821 823 8540 8548 860 970 G3 G4 G5 a2 cell common e300c2 e300c3 e500mc e500mc64 ec603e native power power2 power3 power4 power5 power5+ power6 power6x power7 powerpc powerpc64 rios rios1 rios2 rs64 rsc rsc1 titan powerpc-e500v2-linux-gnuspe-gcc: error: unrecognized argument in option '-mtune=generic' powerpc-e500v2-linux-gnuspe-gcc: note: valid arguments to '-mtune=' are: 401 403 405 405fp 440 440fp 464 464fp 476 476fp 505 601 602 603 603e 604 604e 620 630 740 7400 7450 750 801 821 823 8540 8548 860 970 G3 G4 G5 a2 cell common e300c2 e300c3 e500mc e500mc64 ec603e native power power2 power3 power4 power5 power5+ power6 power6x power7 powerpc powerpc64 rios rios1 rios2 rs64 rsc rsc1 titan failure. removing: _configtest.c _configtest.o Traceback (most recent call last):   File "setup.py", line 266, in <module>     setup_package()   File "setup.py", line 258, in setup_package     setup(**metadata)   File "/home/jenkins/Python-2.7.3/tmp/numpy-1.10.2rc2/numpy/distutils/core.py", line 169, in setup     return old_setup(**new_attr)   File "/usr/lib64/python2.6/distutils/core.py", line 152, in setup     dist.run_commands()   File "/usr/lib64/python2.6/distutils/dist.py", line 975, in run_commands     self.run_command(cmd)   File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command     cmd_obj.run()   File "/home/jenkins/Python-2.7.3/tmp/numpy-1.10.2rc2/numpy/distutils/command/build.py", line 47, in run     old_build.run(self)   File "/usr/lib64/python2.6/distutils/command/build.py", line 134, in run     self.run_command(cmd_name)   File "/usr/lib64/python2.6/distutils/cmd.py", line 333, in run_command     self.distribution.run_command(command)   File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command     cmd_obj.run()   File "/home/jenkins/Python-2.7.3/tmp/numpy-1.10.2rc2/numpy/distutils/command/build_src.py", line 153, in run     self.build_sources()   File "/home/jenkins/Python-2.7.3/tmp/numpy-1.10.2rc2/numpy/distutils/command/build_src.py", line 164, in build_sources     self.build_library_sources(*libname_info)   File "/home/jenkins/Python-2.7.3/tmp/numpy-1.10.2rc2/numpy/distutils/command/build_src.py", line 299, in build_library_sources     sources = self.generate_sources(sources, (lib_name, build_info))   File "/home/jenkins/Python-2.7.3/tmp/numpy-1.10.2rc2/numpy/distutils/command/build_src.py", line 387, in generate_sources     source = func(extension, build_dir)   File "numpy/core/setup.py", line 669, in get_mathlib_info     raise RuntimeError("Broken toolchain: cannot link a simple C program") RuntimeError: Broken toolchain: cannot link a simple C program Thanks, Jo