UIDs of 32 bit size are not available on linux 2.2, and 
SMB_IOC_GETMOUNTUID32 being undefined is a certain sign for this. 
Thus using 32 bit UIDs can be conditionalized by checking for this 
preprocessor symbol.

--- samba-3.0.14a/source/client/smbumount.c.old	2005-02-25 18:59:23.000000000 +0100
+++ samba-3.0.14a/source/client/smbumount.c	2005-05-08 17:03:15.000000000 +0200
@@ -39,7 +39,10 @@
 	/* we set O_NOFOLLOW to prevent users playing games with symlinks to
 	   umount filesystems they don't own */
         int fid = open(mount_point, O_RDONLY|O_NOFOLLOW, 0);
-        __kernel_uid32_t mount_uid;
+#ifdef SMB_IOC_GETMOUNTUID32
+        __kernel_uid32_t mount_uid32;
+#endif
+        uid_t mount_uid;
 	
         if (fid == -1) {
                 fprintf(stderr, "Could not open %s: %s\n",
@@ -47,7 +50,12 @@
                 return -1;
         }
         
-        if (ioctl(fid, SMB_IOC_GETMOUNTUID32, &mount_uid) != 0) {
+#ifdef SMB_IOC_GETMOUNTUID32
+        if (!ioctl(fid, SMB_IOC_GETMOUNTUID32, &mount_uid32))
+                mount_uid = mount_uid32;
+	else
+#endif
+        {
                 __kernel_uid_t mount_uid16;
                 if (ioctl(fid, SMB_IOC_GETMOUNTUID, &mount_uid16) != 0) {
                         fprintf(stderr, "%s probably not smb-filesystem\n",