smbmount compile error

[Irish]

Hello, 

I am using (essentially) slackware 7+, and when I try to compile 2.2.3a with 
"--with-smbmount" it fails with the following;
client/smbmount.c: In function `close_our_files':
client/smbmount.c:97: storage size of `limits' isn't known
client/smbmount.c:99: `RLIMIT_NOFILE' undeclared (first use in this function)

The codeblock in question is:
static void close_our_files(int client_fd)
{
        int i;
        struct rlimit limits;
                                        
        getrlimit(RLIMIT_NOFILE,&limits);
        for (i = 0; i< limits.rlim_max; i++) { 
                if (i == client_fd)
                        continue;
                close(i);
        }
}

Any ideas on how to fix this so I can mount shares would be much appreciated. 

Thank you!
Shannon