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diff -rupN gmsh-3.0.6-source/CMakeLists.txt gmsh-3.0.6-source-new/CMakeLists.txt
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--- gmsh-3.0.6-source/CMakeLists.txt	2017-11-05 16:49:19.133094121 +0100
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+++ gmsh-3.0.6-source-new/CMakeLists.txt	2017-11-05 16:49:19.361093871 +0100
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@@ -1723,8 +1723,9 @@ elseif(APPLE AND ENABLE_OS_SPECIFIC_INST
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   set(GMSH_DOC ../../..)
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   set(GMSH_MAN ../../..)
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 else(WIN32 OR CYGWIN)
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-  set(GMSH_BIN bin)
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-  set(GMSH_LIB lib)
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+  set(GMSH_BIN bin CACHE INTERNAL "Bin path")
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+  set(GMSH_LIB lib${LIB_SUFFIX} CACHE INTERNAL "Lib path")
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+  set(GMSH_INCLUDE include CACHE INTERNAL "Include path")
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   set(GMSH_DOC share/doc/gmsh)
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   set(GMSH_MAN share/man/man1)
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 endif(WIN32 OR CYGWIN)
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@@ -1774,10 +1775,11 @@ 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 python -c "from distutils.sysconfig import get_python_lib; print get_python_lib()" OUTPUT_VARIABLE PYTHON_SITE_PACKAGES OUTPUT_STRIP_TRAILING_WHITESPACE)
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+  install(FILES ${ONELAB_PY} DESTINATION ${PYTHON_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 include/gmsh)
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+  install(FILES ${GMSH_API} DESTINATION ${GMSH_INCLUDE}/gmsh)
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 endif(ENABLE_BUILD_LIB OR ENABLE_BUILD_SHARED OR ENABLE_BUILD_DYNAMIC)
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 install(FILES ${WELCOME_FILE} DESTINATION ${GMSH_DOC} RENAME README.txt)
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 install(FILES ${LICENSE_FILE} DESTINATION ${GMSH_DOC})
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diff -rupN gmsh-3.0.6-source/Common/GmshMessage.cpp gmsh-3.0.6-source-new/Common/GmshMessage.cpp
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--- gmsh-3.0.6-source/Common/GmshMessage.cpp	2017-11-05 13:05:54.000000000 +0100
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+++ gmsh-3.0.6-source-new/Common/GmshMessage.cpp	2017-11-05 16:49:19.361093871 +0100
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@@ -149,12 +149,6 @@ 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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