15.5 Optional Features
Some packages pay attention to --enable-feature options
to configure, where feature indicates an optional part
of the package. They may also pay attention to
--with-package options, where package is something
like ‘gnu-as’ or ‘x’ (for the X Window System). The
README should mention any --enable- and --with-
options that the package recognizes.
For packages that use the X Window System, configure can
usually find the X include and library files automatically, but if it
doesn't, you can use the configure options
--x-includes=dir and --x-libraries=dir to
specify their locations.