autoconfigure error

[Alex Murphy]

Hello !!! im compile samba 3 with CVS

./configure

.....
configure: WARNING: Active Directory cannot be supported without krb5.h
configure: WARNING: linux/quota.h: present but cannot be compiled
configure: WARNING: linux/quota.h: check for missing prerequisite headers?
configure: WARNING: linux/quota.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to bug-autoconf at gnu.org. ##
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING: xfs/xfs_fs.h: present but cannot be compiled
configure: WARNING: xfs/xfs_fs.h: check for missing prerequisite headers?
configure: WARNING: xfs/xfs_fs.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to bug-autoconf at gnu.org. ##
configure: WARNING:     ## ------------------------------------ ##
.....

msa build # locate linux/quota.h
/usr/include/linux/quota.h
/usr/src/linux-2.4.20-xfs-r3/include/linux/quota.h

msa build # locate xfs/xfs_fs.h
/usr/include/xfs/xfs_fs.h
/usr/src/linux-2.4.20-xfs-r3/fs/xfs/xfs_fs.h

what this bug ????