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diff --git a/bindings/pyroot/CMakeLists.txt b/bindings/pyroot/CMakeLists.txt
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index c537bae..3a2118e 100644
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--- a/bindings/pyroot/CMakeLists.txt
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+++ b/bindings/pyroot/CMakeLists.txt
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@@ -36,8 +36,13 @@ endif()
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 file(GLOB pyfiles RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.py)
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 foreach(pyfile ${pyfiles})
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   install(FILES ${pyfile} DESTINATION ${runtimedir})
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-  install(CODE "execute_process(COMMAND python -m py_compile \$ENV{DESTDIR}${runtimedir}/${pyfile})")
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-  install(CODE "execute_process(COMMAND python -O -m py_compile \$ENV{DESTDIR}${runtimedir}/${pyfile})")
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+  if(IS_ABSOLUTE ${runtimedir})
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+    set(absruntimedir ${runtimedir})
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+  else()
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+    set(absruntimedir ${CMAKE_INSTALL_PREFIX}/${runtimedir})
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+  endif()
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+  install(CODE "execute_process(COMMAND ${PYTHON_EXECUTABLE} -m py_compile \$ENV{DESTDIR}${absruntimedir}/${pyfile})")
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+  install(CODE "execute_process(COMMAND ${PYTHON_EXECUTABLE} -O -m py_compile \$ENV{DESTDIR}${absruntimedir}/${pyfile})")
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   file(COPY ${pyfile} DESTINATION ${localruntimedir})
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 endforeach()
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diff --git a/main/CMakeLists.txt b/main/CMakeLists.txt
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index 0f430c9..a431a2b 100644
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--- a/main/CMakeLists.txt
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+++ b/main/CMakeLists.txt
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@@ -43,7 +43,12 @@ if(python)
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   endforeach()
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   install(FILES python/cmdLineUtils.py DESTINATION ${runtimedir})
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-  install(CODE "execute_process(COMMAND ${PYTHON_EXECUTABLE} -m py_compile \$ENV{DESTDIR}${runtimedir}/cmdLineUtils.py)")
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-  install(CODE "execute_process(COMMAND ${PYTHON_EXECUTABLE} -O -m py_compile \$ENV{DESTDIR}${runtimedir}/cmdLineUtils.py)")
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+  if(IS_ABSOLUTE ${runtimedir})
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+    set(absruntimedir ${runtimedir})
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+  else()
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+    set(absruntimedir ${CMAKE_INSTALL_PREFIX}/${runtimedir})
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+  endif()
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+  install(CODE "execute_process(COMMAND ${PYTHON_EXECUTABLE} -m py_compile \$ENV{DESTDIR}${absruntimedir}/cmdLineUtils.py)")
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+  install(CODE "execute_process(COMMAND ${PYTHON_EXECUTABLE} -O -m py_compile \$ENV{DESTDIR}${absruntimedir}/cmdLineUtils.py)")
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   configure_file(python/cmdLineUtils.py ${localruntimedir}/cmdLineUtils.py @ONLY)
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 endif()