Building Lilypond on Ubuntu 16.04

[Thomas Weber]

When I try to "make" Lilypond on Ubuntu 16.04, the freetype headers are 
expected to be located in /usr/include/freetype2/.  That's also where Ubuntu's 
package libfreetype6-dev used to put them, at least in Ubuntu versions 14.04 to 
15.10, but in 16.04 (also 12.04, interestingly), it's in 
/usr/include/freetype2/freetype/.  Hence, a symbolic link won't work and I'm 
not too eager to mess with a folder hierarchy that should be left under control 
of the package manager.

Is there a command line option for make that I can supply to point it to the 
directory where the headers actually are?

Thanks!
Thomas