Hi, I tried upgrading today and had trouble building numpy (after rm -rf build). My full build log is here: http://www.filedump.net/dumped/build1274454454.txt If someone can point me in the right direction, I'd appreciate it very much. To excerpts from the log file: Running from numpy source directory.numpy/core/setup_common.py:86: MismatchCAPIWarning: API mismatch detected, the C API version numbers have to be updated. Current C api version is 4, with checksum 59750b518272c8987f02d66445afd3f1, but recorded checksum for C API version 4 in codegen_dir/cversions.txt is 3d8940bf7b0d2a4e25be4338c14c3c85. If functions were added in the C API, you have to update C_API_VERSION in numpy/core/setup_common.pyc. MismatchCAPIWarning) In file included from numpy/core/src/multiarray/multiarraymodule_onefile.c:36: numpy/core/src/multiarray/buffer.c: At top level: numpy/core/src/multiarray/buffer.c:715: error: conflicting types for ‘_descriptor_from_pep3118_format’ numpy/core/src/multiarray/common.c:221: note: previous implicit declaration of ‘_descriptor_from_pep3118_format’ was here numpy/core/src/multiarray/buffer.c: In function ‘_descriptor_from_pep3118_format’: numpy/core/src/multiarray/buffer.c:751: warning: assignment from incompatible pointer type In file included from numpy/core/src/multiarray/multiarraymodule_onefile.c:45: numpy/core/src/multiarray/multiarraymodule.c: In function ‘initmultiarray’: numpy/core/src/multiarray/multiarraymodule.c:3062: warning: implicit declaration of function ‘_numpymemoryview_init’ error: Command "gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -Inumpy/core/include -Ibuild/src.linux-i686-2.6/numpy/core/include/numpy -Inumpy/core/src/private -Inumpy/core/src -Inumpy/core -Inumpy/core/src/npymath -Inumpy/core/src/multiarray -Inumpy/core/src/umath -Inumpy/core/include -I/usr/include/python2.6 -Ibuild/src.linux-i686-2.6/numpy/core/src/multiarray -Ibuild/src.linux-i686-2.6/numpy/core/src/umath -c numpy/core/src/multiarray/multiarraymodule_onefile.c -o build/temp.linux-i686-2.6/numpy/core/src/multiarray/multiarraymodule_onefile.o" failed with exit status 1 Hope this helps.