I cannot build it successfully

[kamanwu]

`
Scanning dependencies of target gen_opencv_python_source
[ 98%] Generate files for Python bindings and documentation
Note: Class Feature2D has more than 1 base class (not supported by Python C extensions)
Bases: cv::Algorithm, cv::class, cv::Feature2D, cv::Algorithm
Only the first base class will be used
Note: Class detail_GraphCutSeamFinder has more than 1 base class (not supported by Python C extensions)
Bases: cv::detail::GraphCutSeamFinderBase, cv::detail::SeamFinder
Only the first base class will be used
[ 98%] Built target gen_opencv_python_source
Scanning dependencies of target opencv_python3
[ 98%] Building CXX object modules/python3/CMakeFiles/opencv_python3.dir//src2/cv2.cpp.o
c++: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See file:///usr/share/doc/gcc-6/README.Bugs for instructions.
make[2]: *** [modules/python3/CMakeFiles/opencv_python3.dir//src2/cv2.cpp.o] Error 4
make[1]: *** [modules/python3/CMakeFiles/opencv_python3.dir/all] Error 2
make: *** [all] Error 2
modules/python3/CMakeFiles/opencv_python3.dir/build.make:62: recipe for target 'modules/python3/CMakeFiles/opencv_python3.dir/__/src2/cv2.cpp.o' failed
CMakeFiles/Makefile2:3212: recipe for target 'modules/python3/CMakeFiles/opencv_python3.dir/all' failed
Makefile:160: recipe for target 'all' failed

`

[kamanwu]

Just did some search: opencv/opencv#7633
So 2G memory is NOT enough?
Is is possible to solve the problem without increase the memory?