postgres 7.1.3 wth perl 5.8.0

Hi,
i was trying to install postgres 7.1.3 on Redhat 9, using perl 5.8.0-88.3,

./configure --enable-multibyte --enable-odbc --with-perl --with-java
--with-tcl

but make fails on plperl:

gcc -c -I../../../src/include -D_REENTRANT -D_GNU_SOURCE
-DTHREADS_HAVE_PIDS -DDEBUGGING -fno-strict-aliasing
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-I/usr/include/gdbm -O2 -march=i386 -mcpu=i686 -g -DVERSION=\"\"
-DXS_VERSION=\"\" -fPIC
"-I/usr/lib/perl5/5.8.0/i386-linux-thread-multi/CORE" plperl.c
In file included from plperl.c:80:
/usr/lib/perl5/5.8.0/i386-linux-thread-multi/CORE/perl.h:2537:1:
warning: "DEBUG" redefined
In file included from ../../../src/include/postgres.h:49,
from ../../../src/include/executor/spi.h:15,
from plperl.c:51:
../../../src/include/utils/elog.h:23:1: warning: this is the location of
the previous definition
plperl.c: In function `plperl_init_all':
plperl.c:195: `my_perl' undeclared (first use in this function)
plperl.c:195: (Each undeclared identifier is reported only once
plperl.c:195: for each function it appears in.)
plperl.c: In function `plperl_init_safe_interp':
plperl.c:243: warning: passing arg 2 of `perl_parse' from incompatible
pointer type
plperl.c:251: `my_perl' undeclared (first use in this function)
plperl.c: In function `plperl_create_sub':
plperl.c:320: `my_perl' undeclared (first use in this function)
plperl.c: In function `plperl_init_shared_libs':
plperl.c:387: `my_perl' undeclared (first use in this function)
plperl.c:387: warning: passing arg 3 of `Perl_newXS' from incompatible
pointer type
plperl.c:388: warning: passing arg 3 of `Perl_newXS' from incompatible
pointer type
plperl.c: In function `plperl_call_perl_func':
plperl.c:399: `my_perl' undeclared (first use in this function)
plperl.c: In function `plperl_func_handler':
plperl.c:500: `my_perl' undeclared (first use in this function)
plperl.c: In function `plperl_build_tuple_argument':
plperl.c:2159: `my_perl' undeclared (first use in this function)
make[4]: *** [plperl.o] Error 1
make[4]: Leaving directory `/home/postgres1/postgresql-7.1.3/src/pl/plperl'
make[3]: *** [all] Error 2
make[3]: Leaving directory `/home/postgres1/postgresql-7.1.3/src/pl/plperl'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/postgres1/postgresql-7.1.3/src/pl'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/postgres1/postgresql-7.1.3/src'
make: *** [all] Error 2

somebody know how to fix this problem?

thanks,
chris