Trouble building PyNE at material_library

[Miguel Magán Romero]

Hello all:

I am trying to build the version 0.7 of PyNE, but I am having trouble building the material library, either using the install scripts or with the manual installation. The error I get is the following: 

[ 86%] Linking CXX shared module material.so
[ 86%] Built target material
[ 87%] Compiling Cython CXX source for material_library...
Error compiling Cython file:
------------------------------------------------------------
...
        """
        cdef char * c_filename
        filename_bytes = filename.encode('UTF-8')
        c_filename = filename_bytes
        self._inst.from_json(c_filename)
                                      ^
------------------------------------------------------------
/home/mmagan/opt/pyne/pyne-repo/pyne/material_library.pyx:207:39: Cannot assign type 'char *' to 'string'
pyne/CMakeFiles/material_library.dir/build.make:67: fallo en las instrucciones para el objetivo 'pyne/material_library.cxx'
make[2]: *** [pyne/material_library.cxx] Error 1
make[2]: *** Se borra el archivo 'pyne/material_library.cxx'
CMakeFiles/Makefile2:1251: fallo en las instrucciones para el objetivo 'pyne/CMakeFiles/material_library.dir/all'
make[1]: *** [pyne/CMakeFiles/material_library.dir/all] Error 2
Makefile:129: fallo en las instrucciones para el objetivo 'all'
make: *** [all] Error 2
--------------------
If you are having issues building pyne, please report your problem to pyne...@googlegroups.com or look for help at http://pyne.io

However, I don't see how that error my guess is that there is something incompatible about my setup, possibly due to being in Ubuntu 18.04 which requires having python2 installed. How can I scan for possible issues? 

Best regards. 

[Paul Wilson]

Hi there,

It may be necessary to have a log of your build.  Can you capture the output from running `setup.py` and send that along?  It does appear to be related to versions of some of the necessary software, but are able to build successfully on Ubuntu 18.04.

Thanks,

Paul

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[Miguel Magán Romero]

Update: I have been checking the packages and there seemed to be some conflicts between apt and pip. Installing Cython via pip rather than apt solved the issue. I am still working through some issues in the tests, but from what I see, the problem is that I have some outdated apt packages that should be replaced, at least for the user, via pip.  

Many thanks.