lhapdf6 installation problem

Hi,

What is your OS?
This error was quite common on mac machine, but our installer is currently patching lhapdf6.x in order to include a patch that will be include in the next version of lhapdf.

So from here they are multiple road:
1) you are on mac but the patch is not enough (or not working)
2) you are on unix and would also need the patch
3) you are on unix but do not have the devel package for python installed (the command to run depends of your system)

In any case, it could be good to try to install it manually (so without any patch if you are on mac) to see if you can reproduce the error. In that case, it would be worth reporting to lhapdf author which can likely be more helpful than us.

Cheers,

Olivier

Thank you so much for your quick reply.

I am using 18.04 Ubuntu as an operating system. I have tried installing lhapdf manually and then tried to configure it, but it didn't work out. Could you suggest another way to sort it out?

Regards,
Sahabub

Did you check this link:
https://askubuntu.com/questions/1197683/how-do-i-install-python-3-8-in-lubuntu-18-04
How do I install Python 3.8 in Lubuntu 18.04?
askubuntu.com

Cheers,

Olivier

> On 10 Jun 2024, at 17:40, Sahabub Jahedi <email address hidden> wrote:
>
> Question #816211 on MadGraph5_aMC@NLO changed:
> https://answers.launchpad.net/mg5amcnlo/+question/816211
>
> Status: Answered => Open
>
> Sahabub Jahedi is still having a problem:
> Thank you so much for your quick reply.
>
> I am using 18.04 Ubuntu as an operating system. I have tried installing
> lhapdf manually and then tried to configure it, but it didn't work out.
> Could you suggest another way to sort it out?
>
> Regards,
> Sahabub
>
> --
> You received this question notification because you are an answer
> contact for MadGraph5_aMC@NLO.

Hi,
     Thanks for the suggestion. It did solve the issue of downloading lhapdf6, and after that, I installed phythia8 as well. However, I could not install mg5amc_py8_interface. I get the following error:

MG5aMC_PY8_interface compilation output log:
b"g++ MG5aMC_PY8_interface.cc -o MG5aMC_PY8_interface -I/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/hepmc/include -I/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/pythia8//include -ldl -fPIC -lstdc++ -std=c++11 -O2 -DHEPMC2HACK -DGZIP -I/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/zlib/include -L/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/zlib/lib -Wl,-rpath,/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/zlib/lib -lz -L/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/pythia8//lib -Wl,-rpath,/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/pythia8//lib -lpythia8 -ldl -L/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/hepmc/lib -Wl,-rpath,/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/hepmc/lib -lHepMC\n/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/pythia8//lib/libpythia8.so: undefined reference to `pthread_create'\ncollect2: error: ld returned 1 exit status\nMakefile_mg5amc_py8_interface_static:8: recipe for target 'MG5aMC_PY8_interface' failed\nmake: *** [MG5aMC_PY8_interface] Error 1\n"
------------------------------------------------
Error during the compilation of MG5aMC_PY8_interface:
b"g++ MG5aMC_PY8_interface.cc -o MG5aMC_PY8_interface -I/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/hepmc/include -I/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/pythia8//include -ldl -fPIC -lstdc++ -std=c++11 -O2 -DHEPMC2HACK -DGZIP -I/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/zlib/include -L/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/zlib/lib -Wl,-rpath,/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/zlib/lib -lz -L/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/pythia8//lib -Wl,-rpath,/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/pythia8//lib -lpythia8 -ldl -L/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/hepmc/lib -Wl,-rpath,/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/hepmc/lib -lHepMC\n/home/sahabub/Packages/MG5_aMC_v3_5_4/HEPTools/pythia8//lib/libpythia8.so: undefined reference to `pthread_create'\ncollect2: error: ld returned 1 exit status\nMakefile_mg5amc_py8_interface_static:8: recipe for target 'MG5aMC_PY8_interface' failed\nmake: *** [MG5aMC_PY8_interface] Error 1\n"

Please look into it.

Regards,
Sahabub

This is an error that has been reported three times recently, not sure if this is a change of policy of pythia8 or a change of policy of Ubuntu. (I guess that this is pythia8)

Here the link that I can provide is this one:

https://www.squash.io/how-to-fix-undefined-reference-to-pthread_create-in-linux/

that we did investigate in this (messy) thread:
https://answers.launchpad.net/mg5amcnlo/+question/816173

So in short:
 if the first command (sudo apt-get install libpthread-stubs0-dev)to install pthread of your system has no effect (or is not enough):
If that does not help, maybe you should edit the file
HepTools/MG5aMC_PY8_interface/Makefile_mg5amc_py8_interface_static
Then you should add the -ptrhead when compiling
and then recompile the directory with the command:
python compile.py ../pythia8/

Cheers,

Olivier

Thank you so much. This did solve my issue.

Regards,
Sahabub

Just for my information (and to see if I can try to improve the situation)
Was
sudo apt-get install libpthread-stubs0-dev
enough?
or did you need to change the makefile?

Cheers,

olivier

I have edited the make file. After that, I was able to install further files.

Regards,
Sahabub