gcc -c   -g  -DIN_GCC   -W -Wall -Wwrite-strings -Wstrict-prototypes
-Wmissing-prototypes -pedantic -Wno-long-long    -DHAVE_
CONFIG_H    -I. -I. -I/bucket/tbogart/src/gcc-3.4.0/gcc
-I/bucket/tbogart/src/gcc-3.4.0/gcc/. -I/bucket/tbogart/src/gcc-3.4.0
/gcc/../include  /bucket/tbogart/src/gcc-3.4.0/gcc/cppinit.c -o cppinit.o
In file included from /bucket/tbogart/src/gcc-3.4.0/gcc/system.h:202,
                 from /bucket/tbogart/src/gcc-3.4.0/gcc/cppinit.c:23:
/usr/include/time.h:239: warning: `struct sigevent' declared inside parameter list
/usr/include/time.h:239: warning: its scope is only this definition or
declaration, which is probably not what you want.
/bucket/tbogart/src/gcc-3.4.0/gcc/cppinit.c: In function `cpp_read_main_file':
/bucket/tbogart/src/gcc-3.4.0/gcc/cppinit.c:471: incompatible types in return
make[2]: *** [cppinit.o] Error 1
make[2]: Leaving directory `/bucket/tbogart/src/gcc-3.4.0/objdir/gcc'
make[1]: *** [stage1_build] Error 2
make[1]: Leaving directory `/bucket/tbogart/src/gcc-3.4.0/objdir/gcc'
make: *** [bootstrap] Error 2

Looking at *-ibm-aix* build notes:

$ make --version
GNU Make version 3.79.1,

$ instfix -ik IY53606
    All filesets for IY53606 were found.

$ /bucket/tbogart/src/gcc-3.4.0/configure --prefix=/bucket/tbogart/gcc

was used to configure

Built with the default 

$ gcc --version                                                       
2.9-aix51-020209

from the aixtoolbox

This configuration builds gcc-3.3.3