if("${SIMGRID_PYTHON_LIBDIR}" STREQUAL "") # value not manually set
if("${CMAKE_INSTALL_PREFIX}" STREQUAL "/usr")
set(SIMGRID_PYTHON_LIBDIR ${Python3_SITEARCH})
if("${SIMGRID_PYTHON_LIBDIR}" STREQUAL "") # value not manually set
if("${CMAKE_INSTALL_PREFIX}" STREQUAL "/usr")
set(SIMGRID_PYTHON_LIBDIR ${Python3_SITEARCH})