How to rebuild the Editor 

1) You need FPC 2.X.x (I use the 2.0.0) 
2) Copy all sources in the same directory. 
    The main source is editorXXX.pas, where XXX is the version of the program. 
3) Do "fpc editorXXX.pas"

To optimize I do "FPC -Og -O3 editorXXX.pas" and then UPX. 
The options in later versions of FPC have changed.