cc1plus: warning: command line option '-Wstrict-prototypes' is valid for Ada/C/ObjC but not for C++ [enabled by default] In file included from /root/OPENBABEL/openbabel/scripts/python/ openbabel-python.cpp:3358:0: /root/OPENBABEL/openbabel/scripts/python/../../ include/openbabel/math/align.h:26:22: fatal error: Eigen/Core: No such file or directory compilation terminated. error: command 'gcc' failed with exit status 1 make: *** [scripts/CMakeFiles/_openbabel] Error 1 make: *** [scripts/CMakeFiles/_openbabel.dir/all] Error 2 make: *** [all] Error 2Ant one may assume, that something is wrong in include/openbabel/math/align.h file. To be precise, there is a wrong path to the Eigen/Core files. To fix this problem, you have to open include/openbabel/math/align.h in the source directory, and change the line:
#include </root/OPENBABEL/eigen/eigen-eigen-2.0.16/Eigen/Core>good luck!