As per subject line; for about a day I see this when building x86 Laz using fpcup:
C:/development/fpcbootstrap/make.exe -C ide idepkg make.exe[1]: Entering directory `C:/development/lazarus/ide' ../tools/svn2revisioninc.exe .. revision.inc
C:/development/fpcbootstrap/make.exe --assume-new=lazarus.pp lazarus.exe OPT=' -WG -gs -gl -gt -Co -Cr -Ci -Sa -dKeepInstalledPackages -g -gl -O-1 @c:\development\lazarussettings\idemake.cfg
-FUC:\development\lazarus\units\i386-win32\win32
-FEC:\development\lazarus'
make.exe[2]: Entering directory `C:/development/lazarus/ide' C:/development/fpctrunk/bin/i386-win32/fpc.exe -gl -Sci -dlclwin32 -Fu../designer -Fu../debugger -Fu../debugger/frames -Fu../converter -Fu../packager
-Fu../packager/frames -Fu../components/custom -Fuinclude/win -Fuframes -Fu. -Fiinclude -Fi
include/win32 -Fi../images -FE.. -FU../units/i386-win32/win32 -WG -gs -gl -gt -Co -Cr -Ci -Sa -dKeepInstalledPackages -g -gl -O-1 @c:\development\lazarussettings\idemake.cfg
-FUC:\development\lazarus\units\i386-win32\win32
-FEC:\development\lazarus -di386 lazarus.pp
Free Pascal Compiler version 2.7.1 [2013/07/13] for i386 Copyright (c) 1993-2013 by Florian Klaempfl and others Target OS: Win32 for i386
Compiling lazarus.pp
Compiling main.pp
Compiling compiler.pp
Compiling lfmunitresource.pas
Compiling checklfmdlg.pas
Compiling customformeditor.pp
Compiling mainintf.pas
Compiling buildlazdialog.pas
buildlazdialog.pas(58,18) Error: Duplicate identifier "CODETOOLMANAGER" buildlazdialog.pas(58,18) Error: Duplicate identifier "CodeToolManager" Compiling mainbar.pas
mainbar.pas(390,29) Fatal: There were 2 errors compiling module, stopping