Basically it boils down to this running on Ubuntu:

minecraft@minecraftpe01:~$ wget -q -O – https://raw.githubusercontent.com/PocketMine/php-build-scripts/master/installer.sh | bash -s –

If the above doesn't work, try this:

wget -q -O compile.sh https://raw.githubusercontent.com/PocketMine/php-build-scripts/master/compile.sh

then install any dependencies it complains about.

To ensure you are compatible with the latest protocols, ensure your .phar file is updated. Direct link is here:

wget -O PocketMine-MP_1.6dev-27_ef8227a0_API-2.0.0.phar https://bintray.com/pocketmine/PocketMine/download_file?file_path=PocketMine-MP_1.6dev-27_ef8227a0_API-2.0.0.phar

minecraft@minecraftpe01:~$ cp -ip PocketMine-MP_1.6dev-27_ef8227a0_API-2.0.0.phar PocketMine-MP.phar
cp: overwrite 'PocketMine-MP.phar'? y
minecraft@minecraftpe01:~$ ls -altri *phar
694443 -rw-rw-r– 1 minecraft minecraft 3966174 Jun 15 18:50 PocketMine-MP.phar
701448 -rw-rw-r– 1 minecraft minecraft 3966174 Jun 15 18:50 PocketMine-MP_1.6dev-27_ef8227a0_API-2.0.0.phar
minecraft@minecraftpe01:~$ ls -altri *phar*
700731 -rw-rw-r– 1 minecraft minecraft     287 May  2 00:34 PocketMine-MP.phar.sig
700960 -rw-rw-r– 1 minecraft minecraft 3961710 May  2 00:38 PocketMine-MP.phar-old
694443 -rw-rw-r– 1 minecraft minecraft 3966174 Jun 15 18:50 PocketMine-MP.phar
701448 -rw-rw-r– 1 minecraft minecraft 3966174 Jun 15 18:50 PocketMine-MP_1.6dev-27_ef8227a0_API-2.0.0.phar
minecraft@minecraftpe01:~$
minecraft@minecraftpe01:~$

You can also download the latest .phar file to allow your latest client to work with this server.  The .phar file can be found here: https://ci.itxtech.org/job/Genisys/lastSuccessfulBuild/

 Source documentation.  Further sources available here and here.

Cheers,
TK