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diff -rupN --no-dereference gmsh-4.10.4-source/CMakeLists.txt gmsh-4.10.4-source-new/CMakeLists.txt
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--- gmsh-4.10.4-source/CMakeLists.txt	2022-06-19 09:51:05.000000000 +0200
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+++ gmsh-4.10.4-source-new/CMakeLists.txt	2022-06-19 20:24:45.962150717 +0200
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@@ -1880,6 +1880,8 @@ else()
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   set(GMSH_INC ${CMAKE_INSTALL_INCLUDEDIR})
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 endif()
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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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+
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 # mark targets as optional so we can install them separately if needed
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 # (e.g. "make lib" or "make shared" followed by "make install/fast")
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 install(TARGETS gmsh DESTINATION ${GMSH_BIN} OPTIONAL)
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@@ -1891,11 +1893,11 @@ if(ENABLE_BUILD_SHARED OR ENABLE_BUILD_D
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 endif()
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 if(ENABLE_ONELAB AND EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/contrib/onelab)
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-  install(FILES ${ONELAB_PY} DESTINATION ${GMSH_BIN})
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+  install(FILES ${ONELAB_PY} DESTINATION ${PYTHON3_SITE_PACKAGES})
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 endif()
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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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-  install(FILES ${GMSH_PY} DESTINATION ${GMSH_LIB})
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+  install(FILES ${GMSH_PY} DESTINATION ${PYTHON3_SITE_PACKAGES})
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   install(FILES ${GMSH_JL} DESTINATION ${GMSH_LIB})
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   if(ENABLE_PRIVATE_API)
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     install(FILES ${GMSH_PRIVATE_API} DESTINATION ${GMSH_INC}/gmsh)
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diff -rupN --no-dereference gmsh-4.10.4-source/src/common/GmshMessage.cpp gmsh-4.10.4-source-new/src/common/GmshMessage.cpp
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--- gmsh-4.10.4-source/src/common/GmshMessage.cpp	2022-04-26 17:50:41.000000000 +0200
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+++ gmsh-4.10.4-source-new/src/common/GmshMessage.cpp	2022-06-19 20:24:45.962150717 +0200
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@@ -169,14 +169,6 @@ void Msg::Initialize(int argc, char **ar
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   if(CTX::instance()->exeFileName.empty() && _commandLineArgs.size())
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     CTX::instance()->exeFileName = _commandLineArgs[0];
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-  if(_env) {
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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
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-    // find 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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-
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   if(_locale) {
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     // make sure to use the "C" locale; in particular this ensures that we will
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     // use a dot for for the decimal separator when writing ASCII mesh files