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digitalmars.D.learn - Problem building vibe.d in test project

I've setup a test project for vibe.d using dub at

     https://github.com/nordlow/vibe-test

but when I type

     dub

It err as follows:

[per:/home/per/vibtest] 5s 2 $ dub
WARNING: A deprecated branch based version specification is used 
for the dependency vibe-d. Please use numbered versions instead. 
Also note that you can still use the dub.selections.json file to 
override a certain dependency to use a branch instead.
Building vibe-d ~master configuration "libevent", build type 
debug.
Running dmd...
../.dub/packages/vibe-d-master/source/vibe/core/drivers/libevent2.d(461): 
Deprecation: function core.time.Duration.fracSec is deprecated - 
Please use split instead.
../.dub/packages/vibe-d-master/source/vibe/core/drivers/libevent2_tcp.d(110): 
Deprecation: function core.time.Duration.fracSec is deprecated - 
Please use split instead.
../.dub/packages/vibe-d-master/source/vibe/core/drivers/libevent2_tcp.d(269): 
Deprecation: function core.time.Duration.fracSec is deprecated - 
Please use split instead.
../.dub/packages/vibe-d-master/source/vibe/inet/message.d(186): 
Deprecation: constructor std.datetime.SimpleTimeZone.this is 
deprecated - Please use the overload which takes a Duration.
../.dub/packages/vibe-d-master/source/vibe/utils/memory.d(193): 
Warning: calling 
std.exception.enforceEx!(OutOfMemoryError).enforceEx!bool.enforceEx 
without side effects discards return value of type bool, prepend 
a cast(void) if intentional
FAIL 
../.dub/packages/vibe-d-master/.dub/build/libevent-debug-linux.posix-x86_64-dmd-7D4E6F7D7874C
C10CFE2C8A1AA191A2/ 
vibe-d staticLibrary
Error executing command run: dmd failed with exit code 1.

What's wrong?

I'm sitting on 64-bit Ubuntu 14.04.
Jul 06 2014