Hi, when running madgraph (version 2.6.1) and pythia8 with the default pdfs everything works fine. But when using a different pdf from lhapdf (6.1.6), for example: set pdlabel lhapdf set lhaid 21000 the code crashes producing the Terminal output below. I've installed boost, lhapdf and pythia8 before within madgraph using the following commands: install boost install lhapdf install pythia8 Thanks for any help, Tobias INFO: Update the dependent parameter of the param_card.dat Generating 10000 events with run name run_01 survey run_01 INFO: compile directory Not able to open file /lustre/user/tklingl/madgraph/MG5_aMC_v2_6_1/test/crossx.html since no program configured.Please set one in ./input/mg5_configuration.txt INFO: Using LHAPDF v6.1.6 interface for PDFs INFO: Trying to download MSTW2008lo68cl INFO: MSTW2008lo68cl successfully downloaded and stored in /lustre/user/tklingl/madgraph/MG5_aMC_v2_6_1/HEPTools/lhapdf6//share/LHAPDF compile Source Directory Error detected in "generate_events " write debug file /lustre/user/tklingl/madgraph/MG5_aMC_v2_6_1/test/run_01_tag_1_debug.log If you need help with this issue please contact us on https://answers.launchpad.net/mg5amcnlo MadGraph5Error : A compilation Error occurs when trying to compile /lustre/user/tklingl/madgraph/MG5_aMC_v2_6_1/test/Source. The compilation fails with the following output message: /cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase/x86_64/Gcc/gcc620_x86_64_slc6/6.2.0/x86_64-slc6/bin/gfortran -O -w -fbounds-check -fPIC -ffixed-line-length-132 -c -o combine_events.o combine_events.f /cvmfs/atlas.cern.ch/repo/ATLASLocalRootBase/x86_64/Gcc/gcc620_x86_64_slc6/6.2.0/x86_64-slc6/bin/gfortran -o ../bin/internal/combine_events combine_events.o rw_events.o ranmar.o kin_functions.o open_file.o rw_routines.o alfas_functions.o setrun.o -L../lib/ -lmodel -lpdf -I/lustre/user/tklingl/madgraph/MG5_aMC_v2_6_1/HEPTools/lhapdf6/include -I/lustre/user/tklingl/madgraph/MG5_aMC_v2_6_1/HEPTools/boost/include -L/lustre/user/tklingl/madgraph/MG5_aMC_v2_6_1/HEPTools/lhapdf6//lib -lLHAPDF -lLHAPDF -lstdc++ -lbias ../lib//libpdf.a(pdf_lhapdf6.o): In function `lhapdf_getpdfsetlist_': pdf_lhapdf6.cc:(.text+0x40): undefined reference to `_ZN6LHAPDF16availablePDFSetsB5cxx11Ev' ../lib//libpdf.a(pdf_lhapdf6.o): In function `getdatapath_': pdf_lhapdf6.cc:(.text+0x286): undefined reference to `_ZN6LHAPDF5pathsB5cxx11Ev' ../lib//libpdf.a(pdf_lhapdf6.o): In function `setpdfpath_': pdf_lhapdf6.cc:(.text+0x7d5): undefined reference to `_ZN6LHAPDF5pathsB5cxx11Ev' pdf_lhapdf6.cc:(.text+0x9b4): undefined reference to `LHAPDF::setPaths(std::__cxx11::basic_string, std::allocator > const&)' ../lib//libpdf.a(pdf_lhapdf6.o): In function `LHAPDF::pathsPrepend(std::__cxx11::basic_string, std::allocator > const&)': pdf_lhapdf6.cc:(.text._ZN6LHAPDF12pathsPrependERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN6LHAPDF12pathsPrependERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x17): undefined reference to `_ZN6LHAPDF5pathsB5cxx11Ev' pdf_lhapdf6.cc:(.text._ZN6LHAPDF12pathsPrependERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE[_ZN6LHAPDF12pathsPrependERKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE]+0x1a9): undefined reference to `LHAPDF::setPaths(std::__cxx11::basic_string, std::allocator > const&)' ../lib//libpdf.a(pdf_lhapdf6.o): In function `LHAPDF::PDF::set() const': pdf_lhapdf6.cc:(.text._ZNK6LHAPDF3PDF3setEv[_ZNK6LHAPDF3PDF3setEv]+0x207): undefined reference to `LHAPDF::getPDFSet(std::__cxx11::basic_string, std::allocator > const&)' ../lib//libpdf.a(pdf_lhapdf6.o): In function `_ZN6LHAPDF11getPDFIndexB5cxx11Ev': pdf_lhapdf6.cc:(.text._ZN6LHAPDF11getPDFIndexB5cxx11Ev[_ZN6LHAPDF11getPDFIndexB5cxx11Ev]+0xcb): undefined reference to `LHAPDF::findFile(std::__cxx11::basic_string, std::allocator > const&)' ../lib//libpdf.a(pdf_lhapdf6.o): In function `lhapdf_amc::PDFSetHandler::loadMember(int)': pdf_lhapdf6.cc:(.text._ZN10lhapdf_amc13PDFSetHandler10loadMemberEi[_ZN10lhapdf_amc13PDFSetHandler10loadMemberEi]+0x189): undefined reference to `LHAPDF::mkPDF(std::__cxx11::basic_string, std::allocator > const&, int)' collect2: error: ld returned 1 exit status make: *** [../bin/internal/combine_events] Error 1 Please try to fix this compilations issue and retry. Help might be found at https://answers.launchpad.net/mg5amcnlo. If you think that this is a bug, you can report this at https://bugs.launchpad.net/mg5amcnlo quit INFO: INFO:

When	Who	Action	New State
2018-03-08	Olivier Mattelaer	Answer	Answered
2018-03-08	Tobias Klingl	Comment	Answered
2018-03-08	Olivier Mattelaer	Answer	Answered
2018-03-08	Tobias Klingl	Confirm	Solved

MadGraph5_aMC@NLO

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