If I don't include common.h, then gcc on travis fails with int32_t doesn't name a type.
If I include it then, clang fails, with a problem in linking 
"[ 71%] Building CXX object src/shogun/CMakeFiles/shogun.dir/base/class_list.cpp.o
Linking CXX shared library libshogun.so
[ 71%] Built target shogun
make: *** [all] Error 2"

What am I missing?