make step

from https://docs.moodle.org/33/en/Compiling_PHP_from_source

If you have special requirements you may need others. To get the full list of possibilities you can do...

./configure --help

This should complete without errors and finishes with an obvious copyright notice in a box. If you do get errors, it is most likely to be due to missing libraries. Make sure you have added all the libraries described above (with apt-get). Failing that, Google is your friend.

Once that bit is done, it's time to do the actual compiling and linking. Simply do...

make

 This (depending on how fast your machine is) will take some time and will end up with the phrase 

Build complete

.

It's then just a matter of installing the files...

sudo make install