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It is possible to define the
SUBDIRS variable conditionally if,
like in the case of GNU
Inetutils, you want to only build a
subset of the entire package.
To illustrate how this works, let's assume we have two directories
`src/' and `opt/'. `src/' should always be built, but we
want to decide in
./configure whether `opt/' will be built
or not. (For this example we will assume that `opt/' should be
built when the variable
$want_opt was set to
make should thus recurse into `src/' always, and
then maybe in `opt/'.
make dist should always recurse into both `src/' and
`opt/'. Because `opt/' should be distributed even if it is
not needed in the current configuration. This means `opt/Makefile'
should be created unconditionally. (3)
There are two ways to setup a project like this. You can use Automake
conditionals (see section 20. Conditionals) or use Autoconf
variables (see section `Setting Output Variables' in The Autoconf Manual). Using Automake conditionals is the
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