Crypt:DES make problem on Solaris 9

Hi,

I'm trying to install Crypt::DES module on a Solaris9 box and have the
following problem when running make:

gcc -c   -D_POSIX_PTHREAD_SEMANTICS -D_REENTRANT -DNO_HASH_SEED
-fno-strict-aliasing -pipe -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-O   -DVERSION=\"2.03\" -DXS_VERSION=\"2.03\" -fPIC
"-I/usr/local/ActivePerl-5.8/lib/5.8.6/sun4-solaris-thread-multi/CORE"
DES.c
In file included from DES.xs:18:
des.h:5: error: conflicting types for 'des_crypt'
/usr/include/crypt.h:36: error: previous declaration of 'des_crypt' was
here
des.h:5: error: conflicting types for 'des_crypt'
/usr/include/crypt.h:36: error: previous declaration of 'des_crypt' was
here
make: *** [DES.o] Error 1

Thanks for any help,
Brian