Suppose for some reason I wish not to install Red Hat 4 or some other system, so the first obvious solution is not available. I tried building 4.2 from svn on a Red Hat EL3 (Dell PowerEdge 2600 Intel P4 2.8) and obtained a comparison error between stage2 and stage3. Any help, or pointers to other info I missed finding? Thanks. Robert Here's some info about the version and system: [root@xe01 gcc]# svnversion . 122433M I made the following change inspired by googleing the previous mailing list entries, otherwise it would not get anywhere at all: [root@xe01 gcc]# svnversion . 122433M [root@xe01 gcc]# svn status M gcc/config/host-linux.c [root@xe01 gcc]# svn diff gcc/config/host-linux.c Index: gcc/config/host-linux.c =================================================================== --- gcc/config/host-linux.c (revision 122433) +++ gcc/config/host-linux.c (working copy) @@ -23,10 +23,12 @@ #include "coretypes.h" #include <sys/mman.h> #include <limits.h> +#define SSIZE_MAX LONG_MAX /* HERE I changed the file */ #include "hosthooks.h" #include "hosthooks-def.h" For simplicity...'c' only... configured with: ../gcc/configure --prefix=/usr/local/encap/gcc-4.2.0.0 --program-suffix=v42 --enable-languages=c Gcc version: gcc --version gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-56) Error received: Comparing stages 2 and 3 warning: ./cc1-checksum.o differs Bootstrap comparison failure! ./cfg.o differs ./cfgloopanal.o differs ./loop-iv.o differs ./value-prof.o differs ./predict.o differs ./profile.o differs ./ipa-inline.o differs make[2]: *** [compare] Error 1 make[2]: Leaving directory `/home/sources/gcc_source/gcc_42_svn/build' make[1]: *** [stage3-bubble] Error 2 make[1]: Leaving directory `/home/sources/gcc_source/gcc_42_svn/build' make: *** [all] Error 2 Processor /proc/cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 2 model name : Intel(R) Xeon(TM) CPU 2.80GHz stepping : 7 cpu MHz : 2791.281 cache size : 512 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid bogomips : 5588.14