Problem with pythonlibs

ROOT
,
1

Hello,
I’m trying to compile ROOT, on a CentOs machine, to run pyroot on python3. I already did the same operation on other distros in the past with no problem.
When i try to do:
cmake -DPYTHON_EXECUTABLE=/usr/bin/python3.6 ../root-6.18.04/
I get:

-- Found PythonInterp: /usr/bin/python3.6 (found version "3.6.8") 
-- Found PythonLibs: /usr/lib64/libpython2.7.so (found version "2.7.5") 
CMake Error at cmake/modules/SearchInstalledSoftware.cmake:444 (message):
  Version mismatch between Python interpreter (3.6.8) and libraries (2.7.5).

  ROOT cannot work with this configuration.  Please specify only
  PYTHON_EXECUTABLE to CMake with an absolute path to ensure matching
  versions are found.
Call Stack (most recent call first):-- Found PythonInterp: /usr/bin/python3.6 (found version "3.6.8") 
-- Found PythonLibs: /usr/lib64/libpython3.6m.so.1.0 (found version "2.7.5") 
CMake Error at cmake/modules/SearchInstalledSoftware.cmake:444 (message):
  Version mismatch between Python interpreter (3.6.8) and libraries (2.7.5).


  CMakeLists.txt:159 (include)

No problem, dear CMake, I can specify also the pythonlibs path -If i try:
cmake -DPYTHON_EXECUTABLE=/usr/bin/python3.6 -DPYTHON_LIBRARY=/usr/lib64/libpython3.6m.so.1.0 ../root-6.18.04/'
The result is:


-- Looking for python
-- Found PythonInterp: /usr/bin/python3.6 (found version "3.6.8") 
-- Found PythonLibs: /usr/lib64/libpython3.6m.so.1.0 (found version "2.7.5") 
CMake Error at cmake/modules/SearchInstalledSoftware.cmake:444 (message):
  Version mismatch between Python interpreter (3.6.8) and libraries (2.7.5).

Which is quite nonsense for me…
If I try to specify also the header location:
cmake -Dpython=ON -DPYTHON_EXECUTABLE=/usr/bin/python3 -DPYTHON_LIBRARY=/usr/lib64/libpython3.6m.so.1.0 -DPYTHON_INCLUDE_DIR=/usr/include/python3.6m/ ../root-6.18.04/'

Maybe it’s worst:


-- Found PythonInterp: /usr/bin/python3 (found version "3.6.8") 
-- Found PythonLibs: /usr/lib64/libpython3.6m.so.1.0  
CMake Error at cmake/modules/SearchInstalledSoftware.cmake:444 (message):
  Version mismatch between Python interpreter (3.6.8) and libraries ().

I removed “CMakeCache.txt” at every step.
I’m out of ideas, can someone help me?

Thanks,
Alberto

2

I solved the problem installing again python3.6 with yum from the Software Collection. The installation is in another directory and pointing executable and library to this directory I was able to build.
I don’t think I will ever know what was wrong with the first python3.6 installation (which is working fine beside ROOT compilation).
Thanks anyway.
Alberto

3

Hi Alberto,
welcome to the ROOT forum! I’m glad to hear you found a solution. @maxgalli or @etejedor might have an idea of what was wrong with the previous setup.

Cheers,
Enrico

4

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