Also the compiler invocations looks fine:


for the main build:
...
clang -c -Wno-unused-result -Werror=declaration-after-statement -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -Wno-unused-value -Wno-empty-body -Qunused-arguments    -I. -IInclude -I../Include -I/opt/python2.7/include/python2.7   -DPy_BUILD_CORE -o Python/_warnings.o ../Python/_warnings.c
...

And for an extension:


clang -Wno-unused-result -Werror=declaration-after-statement -DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -Wno-unused-value -Wno-empty-body -Qunused-arguments -DHAVE_EXPAT_CONFIG_H=1 -DUSE_PYEXPAT_CAPI -I/Users/ronald/Projects/python/rw/default/Modules/expat -I../Include -I. -IInclude -I/opt/python2.7/include/python2.7 -I/usr/local/include -I/Users/ronald/Projects/python/rw/default/Include -I/Users/ronald/Projects/python/rw/default/build2 -c /Users/ronald/Projects/python/rw/default/Modules/_elementtree.c -o build/temp.macosx-10.8-x86_64-3.4/Users/ronald/Projects/python/rw/default/Modules/_elementtree.o


(Both should be a single line, not sure of that survives copy&paste)


Both with -I/opt/python2.7/include and -I/opt/python2.7/include/python2.7 the build works correctly, and test_build_ext passes without problems.

I have no idea why this failed on Brett's machine :-(