Hi,

Your folder name suggests that you are trying to install version 2.3.1 which is 
rather old. Try the newest release instead (2.4.1).

Kind regards,
Fredrik

On 6 juni 2017 18:03 +0200, Nelly Lian <nel...@lehigh.edu>, wrote:
> Hello open babel team,
> This is what appeared after I entered cmake ../openbabel-2.3.1 2>&1 | tee 
> cmake.out on the Mac terminal. I used ../openbabel-2.3.1 instead of ob-src 
> because that is what the source folder is named.
>
> -- Performing Test SCANDIR_NEEDS_CONST - Failed
> -- Could NOT find Eigen2 (missing:  EIGEN2_INCLUDE_DIR EIGEN2_VERSION_OK) 
> (Required is at least version "2.0.0")
> CMake Error at 
> /Applications/CMake.app/Contents/share/cmake-3.8/Modules/FindPackageHandleStandardArgs.cmake:137
>  (message):
>   Could NOT find PkgConfig (missing: PKG_CONFIG_EXECUTABLE)
> Call Stack (most recent call first):
>
> Thank you
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