PostgreSQL 8.3.8 on AIX5.3 : compilation failed

Hi all,

I am trying to compile PostgreSQL 8.3.8 on AIX 5.3 TL9 (64 bits).
The ".configure" has been
executed with success without any error but the compilation of
PostgreSQL with "gmake"
fails.

Please find below the errors I get :
In file included from
psqlscan.c:2385:
  /usr/include/unistd.h:171: error:
conflicting types for 'lseek64'
  /usr/include/unistd.h:169: error:
previous declaration of 'lseek64' was here
  In file included from
/usr/include/unistd.h:744,
                   from
psqlscan.c:2385:
  /usr/include/sys/lockf.h:64:
error: conflicting types for 'lockf64'
  /usr/include/sys/lockf.h:62:
error: previous declaration of 'lockf64' was here
  In file included from
psqlscan.c:2385:
  /usr/include/unistd.h:807: error:
conflicting types for 'ftruncate64'
  /usr/include/unistd.h:805: error:
previous declaration of 'ftruncate64' was here
  /usr/include/unistd.h:843: error:
conflicting types for 'truncate64'
  /usr/include/unistd.h:841: error:
previous declaration of 'truncate64' was here
  /usr/include/unistd.h:860: error:
conflicting types for 'pread64'
  /usr/include/unistd.h:857: error:
previous declaration of 'pread64' was here
  /usr/include/unistd.h:861: error:
conflicting types for 'pwrite64'
  /usr/include/unistd.h:858: error:
previous declaration of 'pwrite64' was here
  /usr/include/unistd.h:928: error:
conflicting types for 'fclear64'
  /usr/include/unistd.h:925: error:
previous declaration of 'fclear64' was here
  /usr/include/unistd.h:929: error:
conflicting types for 'fsync_range64'
  /usr/include/unistd.h:926: error:
previous declaration of 'fsync_range64' was here
  gmake[3]: *** [psqlscan.o] Error 1
  gmake[3]: Leaving directory
`/home/PostgreSQL_8.3.8/sources/postgresql-8.3.8/src/bin/psql'
  gmake[2]: *** [all] Error 2
  gmake[2]: Leaving directory
`/home/PostgreSQL_8.3.8/sources/postgresql-8.3.8/src/bin'
  gmake[1]: *** [all] Error 2
  gmake[1]: Leaving directory
`/home/PostgreSQL_8.3.8/sources/postgresql-8.3.8/src'
  gmake: *** [all] Error 2

I read on the PostgreSQL.fr's forum that this error is linked to large
files in 64 bits system, allowing to read / write files of 2 GB and
over.
I also read that I can use the "-disable-largefile"
while I launched ".configure"
but I don't really understand the problem.
If PostgreSQL can't use such files, except for trace logs, why the
compilation fails on large files ?

Thank you for your help.

Regards,
Alexandra