I installed fpc 2.6.0 with the rpm (32 bits) from freepascal.org. Got lazarus 1.0.2 sources from svn.
First problem:
Free Pascal Compiler version 2.6.0 [2011/12/23] for i386 Copyright (c) 1993-2011 by Florian Klaempfl and others Target OS: Linux for i386
Compiling interfaces.pas
Compiling gtk2wsstdctrls.pp
gtk2wsstdctrls.pp(1528,26) Error: Incompatible types: got "Boolean32" expected "LongInt" gtk2wsstdctrls.pp(2687) Fatal: There were 1 errors compiling module, stopping
Ok, changed gTrue to 1 (maybe the fpc-2.6.0 rpm was build with -dnoboolean32?)
Second problem (which I'm stuck at):
Free Pascal Compiler version 2.6.0 [2011/12/23] for i386 Copyright (c) 1993-2011 by Florian Klaempfl and others Target OS: Linux for i386
Compiling ideintf.pas
Compiling actionseditor.pas
Compiling componenteditors.pas
Compiling propedits.pp
Compiling frmselectprops.pas
Compiling idewindowintf.pas
idewindowintf.pas(1169,33) Error: identifier idents no member "DesktopLeft" idewindowintf.pas(1170,36) Error: identifier idents no member "DesktopLeft" idewindowintf.pas(1173,34) Error: identifier idents no member "DesktopTop" idewindowintf.pas(1174,39) Error: identifier idents no member "DesktopTop" idewindowintf.pas(1177,39) Error: identifier idents no member "DesktopLeft" idewindowintf.pas(1184,40) Error: identifier idents no member "DesktopTop" idewindowintf.pas(2067,18) Error: identifier idents no member "WorkAreaRect" idewindowintf.pas(2096) Fatal: There were 7 errors compiling module, stopping
Bye