Cmake is not able to find Python-libraries

Question

Getting this error   sudo  unable to resolve host coderw ll -- Could NOT find PythonLibs  missing   PYTHON LIBRARIES PYTHON INCLUDE DIRS   CMake Error at  usr share cmake-2 8 Modules FindPackageHandleStandardArgs cmake 108       message   Could NOT find PythonInterp  missing  PYTHON EXECUTABLE  Call Stack  most recent call first    usr share cmake-2 8 Modules FindPackageHandleStandardArgs cmake 315     FPHSA FAILURE MESSAGE   usr share cmake-2 8 Modules FindPythonInterp cmake 139   FIND PACKAGE HANDLE STANDARD ARGS  Code cmake Modules FindNumPy cmake 10  find package  CMakeLists txt 114  find package     -- Configuring incomplete  errors occurred  See also   home coderwall Desktop rdkit build CMakeFiles CMakeOutput log   See also   home coderwall Desktop rdkit build CMakeFiles CMakeError log     I have already installed    sudo apt-get install python-dev Environment variable are already set as follow   PYTHON INCLUDE DIRS  usr include python2 7  PYTHON LIBRARIES  usr lib python2 7 config libpython2 7 so    Location of python h    usr lib include python2 7 python h  Location of python libs   usr lib python2 7  How to solve this

User · Answer

For me was helpful next    gt  apt-get install python-dev python3-dev

User · Answer

This problem can also happen in Windows  Cmake looks into the registry and sometimes python values are not set  For those with similar problem   http   ericsilva org 2012 10 11 restoring-your-python-registry-in-windows   Just create a  reg file to set the necessary keys and edit accordingly to match your setup   Windows Registry Editor Version 5 00   HKEY CURRENT USER Software Python    HKEY CURRENT USER Software Python Pythoncore    HKEY CURRENT USER Software Python Pythoncore 2 6    HKEY CURRENT USER Software Python Pythoncore 2 6 InstallPath     C   python26    HKEY CURRENT USER Software Python Pythoncore 2 6 PythonPath     C   python26 C   python26  Lib   C   python26  DLLs      HKEY CURRENT USER Software Python Pythoncore 2 7    HKEY CURRENT USER Software Python Pythoncore 2 7 InstallPath     C   python27    HKEY CURRENT USER Software Python Pythoncore 2 7 PythonPath     C   python27 C   python27  Lib   C   python27  DLLs

User · Answer

In case that might help  I found a workaround for a similar problem  looking at the cmake doc   https   cmake org cmake help v3 0 module FindPythonLibs html  You must set two env vars for cmake to find coherent versions  Unfortunately this is not a generic solution     cmake -DPYTHON LIBRARY   HOME   pyenv versions 3 8 0 lib libpython3 8 a -DPYTHON INCLUDE DIR   HOME   pyenv versions 3 8 0 include python3 8  cern root

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Note that if you are using cMake version 3 12 or later  variable PythonInterp and PythonLibs has been changed into Python   So we use   find package Python   PY VERSION  REQUIRED   instead of   find package PythonInterp   PY VERSION  REQUIRED  find package PythonLibs   PY VERSION  REQUIRED   see https   cmake org cmake help v3 12 module FindPython html for details

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Some last version of Ubuntu installs Python 3 4 by default and the CMake version from Ubuntu  2 8  only searches up to Python 3 3   Try to add set Python ADDITIONAL VERSIONS 3 4  before the find package statement   Remember to clean CMakeCache txt too

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Paste this into your CMakeLists txt     find python execute process COMMAND python-config --prefix OUTPUT VARIABLE PYTHON SEARCH PATH  string REGEX REPLACE   n      PYTHON SEARCH PATH    PYTHON SEARCH PATH    file GLOB RECURSE PYTHON DY LIBS   PYTHON SEARCH PATH  lib libpython  dylib   PYTHON SEARCH PATH  lib libpython  so  if  PYTHON DY LIBS      list GET PYTHON DY LIBS 0 PYTHON LIBRARY      message  -- Find shared libpython    PYTHON LIBRARY    else       message WARNING  Cannot find shared libpython  try find package   endif    find package PythonInterp  find package PythonLibs   PYTHON VERSION STRING  EXACT

User · Answer

Even after adding -DPYTHON INCLUDE DIR and -DPYTHON LIBRARY as suggested above  I was still facing the error Could NOT find PythonInterp  What solved it was adding -DPYTHON EXECUTABLE FILEPATH  to cmake as suggested in https   github com pybind pybind11 issues 99 issuecomment-182071479   cmake      -DPYTHON INCLUDE DIR   python -c  from distutils sysconfig import get python inc  print get python inc         -DPYTHON LIBRARY   python -c  import distutils sysconfig as sysconfig  print sysconfig get config var  LIBDIR        -DPYTHON EXECUTABLE FILEPATH  which python

User · Answer

I hit the same issue and discovered the error message gives misleading variable names  Try setting the following  singular instead of plural    PYTHON INCLUDE DIR  usr include python2 7  PYTHON LIBRARY  usr lib python2 7 config libpython2 7 so   The  plural  variables you see error messages about are values that the PythonLibs sets up when it is initialised correctly

User · Answer

You can fix the errors by appending to the cmake command the -DPYTHON LIBRARY and -DPYTHON INCLUDE DIR flags filled with the respective folders   Thus  the trick is to fill those parameters with the returned information from the python interpreter  which is the most reliable  This may work independently of your python location version  also for Anaconda users      cmake      -DPYTHON INCLUDE DIR   python -c  from distutils sysconfig import get python inc  print get python inc         -DPYTHON LIBRARY   python -c  import distutils sysconfig as sysconfig  print sysconfig get config var  LIBDIR        If the version of python that you want to link against cmake is Python3 X and the default python symlink points to Python2 X  python3 -c     can be used instead of python -c       In case that the error persists  you may need to update the cmake to a higher version as stated by  pdpcosta and repeat the process again

User · Answer

I was facing this problem while trying to compile OpenCV 3 on a Xubuntu 14 04 Thrusty Tahr system  With all the dev packages of Python installed  the configuration process was always returning the message   Could NOT found PythonInterp   usr bin python2 7  found suitable version  2 7 6   minimum required is  2 7   Could NOT find PythonLibs  missing  PYTHON INCLUDE DIRS   found suitable exact version  2 7 6   Found PythonInterp   usr bin python3 4  found suitable version  3 4   minimum required is  3 4   Could NOT find PythonLibs  missing  PYTHON LIBRARIES   Required is exact version  3 4 0     The CMake version available on Thrusty Tahr repositories is 2 8  Some posts inspired me to upgrade CMake  I ve added a PPA CMake repository which installs CMake version 3 2   After the upgrade everything ran smoothly and the compilation was successful

[python] Cmake is not able to find Python-libraries

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