fix the older mirage libraries with upper bounds
iocaml-kernel depends on older Ctypes due to Array->CArray change

See andrewray/iocaml#20
add depexts for scrypt
add source depext for nanomsg
Merge pull request #2122 from avsm/depext-scrypt

add depexts for scrypt
Merge pull request #2123 from avsm/depext-nanomsg

add source depext for nanomsg
Add gdal 0.3.0 (ctypes update)
Try using a PPA rather than building from source
Fix gist URL
Merge pull request #2124 from hcarty/gdal-0.3.0

Add gdal 0.3.0 (ctypes update)
fix nanomsg (#2123)
Add lwt-zmq 2.0.0
Merge pull request #2126 from samoht/master

fix nanomsg (#2123)
Merge pull request #2125 from hcarty/zeromq-use-ppa

zeromq- Try using a PPA rather than building from source
iocaml-kernel: fix ctypes rev; via @samoht
fix ounit constraint for hamt
hamt: use macro make and not force use of gmake
mldonkey: add depext for zlib
Merge pull request #2127 from hcarty/lwt-zmq-2.0.0

Add lwt-zmq 2.0.0
Merge pull request #2118 from avsm/ctypes-rev-dep

iocaml-kernel depends on older Ctypes due to Array->CArray change