INN make fails with perl 5.8.0

[franconews]

Make of inn 2.3.3 (2.3.2 also) fails since I have upgraded perl from 5.6.1 to 
5.8.0. (configure --with-perl)
Here is the log :

gcc -g -O2 -I../include   -D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing 
-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/gdbm  
-I/usr/lib/perl5/5.8.0/i386-linux-thread-multi/CORE    -c perl.c
In file included from perl.c:25:
../include/libinn.h:78: parse error before numeric constant
perl.c: In function `PerlParse':
perl.c:100: warning: passing arg 2 of `perl_parse' from incompatible pointer 
type
perl.c: In function `xs_init':
perl.c:338: warning: passing arg 3 of `Perl_newXS' from incompatible pointer 
type
make[1]: *** [perl.o] Erreur 1