Failure on buildbot.
http://buildbot.python.org/all/builders/AMD64%20Ubuntu%20LTS%203.x/builds/4599/steps/test/logs/stdio


running build_ext
building 'cmath' extension
gcc -pthread -fPIC -Wno-unused-result -Werror=declaration-after-statement -g -O0 -Wall -Wstrict-prototypes -I./Include -I. -IInclude -I/usr/include/x86_64-linux-gnu -I/usr/local/include -I/opt/python/3.x.langa-ubuntu/build/Include -I/opt/python/3.x.langa-ubuntu/build -c /opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c -o build/temp.linux-x86_64-3.5-pydebug/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.o
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c: In function ‘c_atanh’:
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c:316:9: warning: implicit declaration of function ‘c_neg’ [-Wimplicit-function-declaration]
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c:316:9: error: incompatible type for argument 1 of ‘c_atanh’
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c:307:1: note: expected ‘Py_complex’ but argument is of type ‘int’
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c: In function ‘cmath_log’:
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c:845:9: warning: implicit declaration of function ‘c_quot’ [-Wimplicit-function-declaration]
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c:845:11: error: incompatible types when assigning to type ‘Py_complex’ from type ‘int’
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c: In function ‘cmath_polar’:
/opt/python/3.x.langa-ubuntu/build/Modules/cmathmodule.c:946:5: warning: implicit declaration of function ‘c_abs’ [-Wimplicit-function-declaration]

Failed to build these modules:
cmath