As the title says, dev-python/numpy-1.6.2 fails to find both blas_info and lapack_info with icc-provided lapack and blas: ==== >>> Emerging (1 of 1) dev-python/numpy-1.6.2 * numpy-1.6.2.tar.gz SHA256 SHA512 WHIRLPOOL size ;-) ... [ ok ] >>> cfg-update-1.8.2-r1: Creating checksum index... * Using following Fortran compiler: * F77: x86_64-pc-linux-gnu-gfortran * FC: x86_64-pc-linux-gnu-gfortran >>> Unpacking source... >>> Unpacking numpy-1.6.2.tar.gz to /var/tmp/portage/dev-python/numpy-1.6.2/work >>> Source unpacked in /var/tmp/portage/dev-python/numpy-1.6.2/work >>> Preparing source in /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2 ... * Applying numpy-1.6.1-atlas.patch ... [ ok ] >>> Source prepared. >>> Configuring source in /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2 ... >>> Source configured. >>> Compiling source in /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2 ... * Building of dev-python/numpy-1.6.2 with CPython 2.7... python2.7 setup.py build -b build-2.7 config_fc --noopt --noarch --fcompiler=gnu95 Running from numpy source directory.F2PY Version 2 blas_opt_info: blas_mkl_info: libraries mkl,vml,guide not found in /usr/local/lib64 libraries mkl,vml,guide not found in /usr/local/lib libraries mkl,vml,guide not found in /usr/lib64 libraries mkl,vml,guide not found in /usr/lib NOT AVAILABLE system_info: NOT AVAILABLE /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2/numpy/distutils/system_info.py:1419: UserWarning: Atlas (http://math-atlas.sourceforge.net/) libraries not found. Directories to search for the libraries can be specified in the numpy/distutils/site.cfg file (section [atlas]) or by setting the ATLAS environment variable. warnings.warn(AtlasNotFoundError.__doc__) blas_info: /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2/numpy/distutils/system_info.py:532: UserWarning: Specified path /opt/intel/composerxe-2013_update1.1.117/mkl/lib/intel64 is invalid. warnings.warn('Specified path %s is invalid.' % d) libraries mkl_rt not found in /usr/lib64 NOT AVAILABLE /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2/numpy/distutils/system_info.py:1428: UserWarning: Blas (http://www.netlib.org/blas/) libraries not found. Directories to search for the libraries can be specified in the numpy/distutils/site.cfg file (section [blas]) or by setting the BLAS environment variable. warnings.warn(BlasNotFoundError.__doc__) blas_src_info: NOT AVAILABLE /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2/numpy/distutils/system_info.py:1431: UserWarning: Blas (http://www.netlib.org/blas/) sources not found. Directories to search for the sources can be specified in the numpy/distutils/site.cfg file (section [blas_src]) or by setting the BLAS_SRC environment variable. warnings.warn(BlasSrcNotFoundError.__doc__) NOT AVAILABLE lapack_opt_info: lapack_mkl_info: mkl_info: libraries mkl,vml,guide not found in /usr/local/lib64 libraries mkl,vml,guide not found in /usr/local/lib libraries mkl,vml,guide not found in /usr/lib64 libraries mkl,vml,guide not found in /usr/lib NOT AVAILABLE NOT AVAILABLE /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2/numpy/distutils/system_info.py:1334: UserWarning: Atlas (http://math-atlas.sourceforge.net/) libraries not found. Directories to search for the libraries can be specified in the numpy/distutils/site.cfg file (section [atlas]) or by setting the ATLAS environment variable. warnings.warn(AtlasNotFoundError.__doc__) lapack_info: libraries mkl_rt not found in /usr/lib64 NOT AVAILABLE /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2/numpy/distutils/system_info.py:1345: UserWarning: Lapack (http://www.netlib.org/lapack/) libraries not found. Directories to search for the libraries can be specified in the numpy/distutils/site.cfg file (section [lapack]) or by setting the LAPACK environment variable. warnings.warn(LapackNotFoundError.__doc__) lapack_src_info: NOT AVAILABLE /var/tmp/portage/dev-python/numpy-1.6.2/work/numpy-1.6.2/numpy/distutils/system_info.py:1348: UserWarning: Lapack (http://www.netlib.org/lapack/) sources not found. Directories to search for the sources can be specified in the numpy/distutils/site.cfg file (section [lapack_src]) or by setting the LAPACK_SRC environment variable. warnings.warn(LapackSrcNotFoundError.__doc__) NOT AVAILABLE === However, they are found if numpy is downgraded to 1.6.1-r1: === blas_info: FOUND: libraries = ['mkl_rt'] library_dirs = ['/opt/intel/composerxe-2013_update1.1.117/mkl/lib/intel64'] language = f77 FOUND: libraries = ['mkl_rt'] library_dirs = ['/opt/intel/composerxe-2013_update1.1.117/mkl/lib/intel64'] define_macros = [('NO_ATLAS_INFO', 1)] language = f77 ... lapack_info: FOUND: libraries = ['mkl_rt'] library_dirs = ['/opt/intel/composerxe-2013_update1.1.117/mkl/lib/intel64'] language = f77 FOUND: libraries = ['mkl_rt', 'mkl_rt'] library_dirs = ['/opt/intel/composerxe-2013_update1.1.117/mkl/lib/intel64'] define_macros = [('NO_ATLAS_INFO', 1)] language = f77 ===