P.S. I have also installed eigen3 via homebrew and http://eigen.tuxfamily.org 
<http://eigen.tuxfamily.org/>.

> On Jun 2, 2017, at 4:32 PM, 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):
> <make.out>
> <cmake.out>
> 
> Thank you

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