[Vala] Gee.ReadOnlyMap could not be found?

[san hoi <hoisan49 gmail com>]

Hi, I try to build wizbit tar.gz snapshot.
(http://git.codethink.co.uk/?p=wizbit;a=summary)

my emvironment:
vala 0.7.9 (official tar.bz2)
libgee-0.5 (git clone git://git.gnome.org/libgee)

[mymas localhost wizbit]$ make
make  all-recursive
make[1]: Entering directory `/home/mymas/wizbit'
Making all in wizbit
make[2]: Entering directory `/home/mymas/wizbit/wizbit'
/usr/bin/valac -C --basedir .. --pkg posix --pkg glib-2.0 --pkg
gio-2.0 --pkg gio-unix-2.0 --pkg sqlite3 --pkg gee-1.0 --library
wizbit config.vapi blob_store.vala commit.vala commit_builder.vala
commit_store.vala store.vala bit.vala file.vala uuid.vapi utils.vala
breadthfirst.vala iterator.vala sync.vala
wizbit/commit.vala:63.10-63.41: error: The type name `Gee.ReadOnlyMap'
could not be found
                public Gee.ReadOnlyMap<string,Wiz.File> streams {
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
wizbit/commit.vala:63.10-63.41: error: The type name `Gee.ReadOnlyMap'
could not be found
                public Gee.ReadOnlyMap<string,Wiz.File> streams {
                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Compilation failed: 2 error(s), 0 warning(s)
make[2]: *** [libwizbit.vala.stamp] Error 1
make[2]: Leaving directory `/home/mymas/wizbit/wizbit'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/mymas/wizbit'
make: *** [all] Error 2

umm... Gee.HashMap is ok, but Gee.ReadOnlyMap is error.
ReadOnlyMap is deprecated?