While step by step compiling some of my old projects I got this error:
Lazarus 1.8RC5 Error on compiling a project.jpg
Projekt kompilieren, Ziel: exeOutput\TFileExplorer.exe: Exit code 1, Fehler: 1, Warnungen: 1
Warning: Recompiling Win32Int, checksum changed for character
win32int.pp(37,14) Fatal: Kann Win32Int nicht finden verwendet von Interfaces, incompatible ppu=C:\lazarus\lcl\units\i386-win32\win32\win32int.ppu, Package LCL
The Project was last compiled on 2016-06-08 (successfully ..)