I have Xcode installed and other large projects build just fine. I ran “./configure && make” in the “Python-2.7.13” directory and “make” generated two errors both referring to the same thing missing. The exact error messages are copied and pasted below. dyld: lazy symbol binding failed: Symbol not found: _getentropy Referenced from: /Users/bryandunphy/Downloads/Python-2.7.13/./python.exe Expected in: /usr/lib/libSystem.B.dylib dyld: Symbol not found: _getentropy Referenced from: /Users/bryandunphy/Downloads/Python-2.7.13/./python.exe Expected in: /usr/lib/libSystem.B.dylib /bin/sh: line 1: 14105 Trace/BPT trap: 5 CC='gcc' LDSHARED='gcc -bundle -undefined dynamic_lookup -L/usr/local/lib' OPT='-DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes' _TCLTK_INCLUDES='' _TCLTK_LIBS='' ./python.exe -E ./setup.py $quiet build make: *** [sharedmods] Error 133 That was the final output from make. Any ideas on how to fix these errors and allow a build?