Source code taken from:

https://github.com/openbabel/openbabel

Minor changes (=file /src/ops/gen3d.cpp - commented line 67) 
in this particular version were done by Alan Liska & Veronika Ruzickova 
(JHI Prague, Czech Republic). 

Homepage of the OPENBABEL project:

http://openbabel.org/wiki/Main_Page

License: GPL (v.2)

Compilation:

(1) run CMake GUI, select folder with source code, (make and) select the folder in
    which the build will be created
(2) in CMake GUI confirm "configure", select "MinGW makefiles", "native compiler"
(3) in CMake GUI set the option checkboxes to following values
    BUILD_DOCS		yes
    BUILD_EXAMPLES	yes
    BUILD_GUI		no
    BUILD_MIXED		no
    BUILD_SHARED	no (of extraordinary importance)
    BUILD_TESTING	yes
    WITH_INCHI		no
    WITH_JSON		yes
    WITH_STATIC_INCHI	no
    WITH_STATIC_LIBXML	no
    and delete items ZLIB_INCLUDE_DIR, ZLIB_LIBRARY_DEBUG, ZLIB_LIBRARY_RELEASE;
(6) in CMake GUI execute "configure" (again) and then "generate"
(7) open cmd and run the compilation by
    mingw32-make
(8) resulting libraries and binaries will appear inside of the corresponding
    subfolders inside of the release folder