How ironic, a python file to give scons a hard time. ;-)
The problem is like this: lyx2lyx_version.py is generated by lyx2lyx_version.py.in so 'scons install' generates and install lyx2lyx_version.py. At the same time, scons globs files under lyx2lyx and install them. If there is already a lyx2lyx_version.py in this directory, as a result of autotools installation runs, scons fails because DESTDIR/.../lyx2lyx_version.py will be installed twice. By using explicit file list, pre-existing lyx2lyx_version.py will be ignored... This is why development/scons/scons_manifest.py is added to the scons system. Bo