make install in the brave new build system world

[Christoph Hellwig]

When doing make install in xfsprogs I get a lot of spew like this:

/usr/bin/make -C include install
make[1]: Entering directory `/root/xfsprogs-dev/include'
make[1]: Nothing to be done for `install'.
make[1]: Leaving directory `/root/xfsprogs-dev/include'
/usr/bin/make -C libxfs install
make[1]: Entering directory `/root/xfsprogs-dev/libxfs'
    [DEP]
gcc -MM -I. -g -O2 -DNDEBUG -DVERSION=\"3.1.1\" -DLOCALEDIR=\"/usr/share/locale\" -DPACKAGE=\"xfsprogs\" -I../include -DENABLE_GETTEXT -D_GNU_SOURCE -D_XOPEN_SOURCE=500 -D_FILE_OFFSET_BITS=64 -funsigned-char -fno-strict-aliasing -Wall cache.c init.c kmem.c logitem.c rdwr.c trans.c util.c xfs_alloc.c xfs_ialloc.c xfs_inode.c xfs_btree.c xfs_alloc_btree.c xfs_ialloc_btree.c xfs_bmap_btree.c xfs_da_btree.c xfs_dir2.c xfs_dir2_leaf.c xfs_attr_leaf.c xfs_dir2_block.c xfs_dir2_node.c xfs_dir2_data.c xfs_dir2_sf.c xfs_bmap.c xfs_mount.c xfs_rtalloc.c xfs_trans.c xfs_attr.c linux.c | /bin/sed -e 's,^\([^:]*\)\.o,\1.lo,' > .dep
make[1]: Leaving directory `/root/xfsprogs-dev/libxfs'


So it seems like for some reason we do

 a) regenerate the dependencies in the install target (we already re-did
    them once before as part of the all target implied by make install)
 b) for some reason the new silent make rules don't apply to this.

Any idea why?