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diff -rupN gmsh-4.0.0-source/CMakeLists.txt gmsh-4.0.0-source-new/CMakeLists.txt
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--- gmsh-4.0.0-source/CMakeLists.txt	2018-08-23 11:57:38.816721896 +0200
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+++ gmsh-4.0.0-source-new/CMakeLists.txt	2018-08-23 11:57:38.952721889 +0200
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@@ -1769,7 +1769,8 @@ if(ENABLE_BUILD_SHARED OR ENABLE_BUILD_D
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 endif(ENABLE_BUILD_SHARED OR ENABLE_BUILD_DYNAMIC)
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 if(ENABLE_ONELAB)
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-  install(FILES ${ONELAB_PY} DESTINATION ${GMSH_BIN})
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+  execute_process ( COMMAND python3 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())" OUTPUT_VARIABLE PYTHON3_SITE_PACKAGES OUTPUT_STRIP_TRAILING_WHITESPACE)
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+  install(FILES ${ONELAB_PY} DESTINATION ${PYTHON3_SITE_PACKAGES})
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 endif(ENABLE_ONELAB)
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 if(ENABLE_BUILD_LIB OR ENABLE_BUILD_SHARED OR ENABLE_BUILD_DYNAMIC)
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   install(FILES ${GMSH_API} DESTINATION ${GMSH_INC})
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diff -rupN gmsh-4.0.0-source/Common/GmshMessage.cpp gmsh-4.0.0-source-new/Common/GmshMessage.cpp
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--- gmsh-4.0.0-source/Common/GmshMessage.cpp	2018-06-27 22:44:49.000000000 +0200
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+++ gmsh-4.0.0-source-new/Common/GmshMessage.cpp	2018-08-23 11:57:38.953721888 +0200
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@@ -154,12 +154,6 @@ void Msg::Init(int argc, char **argv)
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   if(CTX::instance()->exeFileName.empty() && argc && argv)
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     CTX::instance()->exeFileName = argv[0];
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-  // add the directory where the binary is installed to the path where Python
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-  // looks for modules, and to the path for executables (this allows us to find
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-  // the onelab.py module or subclients automatically)
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-  addGmshPathToEnvironmentVar("PYTHONPATH");
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-  addGmshPathToEnvironmentVar("PATH");
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-
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   InitializeOnelab("Gmsh");
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 }
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