Edwin, your commit: http://www.lyx.org/trac/changeset/18478 broke the build system because you didn't update the make and SCons files. I repaired this part: http://www.lyx.org/trac/changeset/18481
Why did you remove the attic folder? Did you get an OK from two developers to do this; I can't find this in the list.
If this was correct, then please also modify the makefile and SCons file to reflect this change. thanks and regards Uwe