Hi,  I’ve installed kwant through Homebrew, Michaels provided method. Now I’m trying to update Tinyarray through pip and get the following message: Bass-MacBook-Pro:Desktop basnijholt$ pip install tinyarray Requirement already satisfied (use --upgrade to upgrade): tinyarray in /usr/local/lib/python2.7/site-packages Bass-MacBook-Pro:Desktop basnijholt$ pip install tinyarray --upgrade Collecting tinyarray from https://pypi.python.org/packages/source/t/tinyarray/tinyarray-1.0.5.tar.gz#m...   Using cached tinyarray-1.0.5.tar.gz Installing collected packages: tinyarray   Found existing installation: tinyarray 1.0.2     Can't uninstall 'tinyarray'. No files were found to uninstall.   Running setup.py install for tinyarray     building 'tinyarray' extension     clang -fno-strict-aliasing -fno-common -dynamic -I/usr/local/include -I/usr/local/opt/sqlite/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/arithmetic.cc -o build/temp.macosx-10.10-x86_64-2.7/src/arithmetic.o     clang -fno-strict-aliasing -fno-common -dynamic -I/usr/local/include -I/usr/local/opt/sqlite/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/array.cc -o build/temp.macosx-10.10-x86_64-2.7/src/array.o     clang -fno-strict-aliasing -fno-common -dynamic -I/usr/local/include -I/usr/local/opt/sqlite/include -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/System/Library/Frameworks/Tk.framework/Versions/8.5/Headers -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -I/usr/local/Cellar/python/2.7.9/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c src/functions.cc -o build/temp.macosx-10.10-x86_64-2.7/src/functions.o     clang++ -bundle -undefined dynamic_lookup -L/usr/local/lib -L/usr/local/opt/sqlite/lib -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk build/temp.macosx-10.10-x86_64-2.7/src/arithmetic.o build/temp.macosx-10.10-x86_64-2.7/src/array.o build/temp.macosx-10.10-x86_64-2.7/src/functions.o -o build/lib.macosx-10.10-x86_64-2.7/tinyarray.so Successfully installed tinyarray-1.0.2 Bass-MacBook-Pro:Desktop basnijholt$  Regards,  Bas