Created attachment 144195 [details] [review]
patch which solves the problem

Hey,

due to the following code :
AC_ARG_ENABLE(python,
        [AC_HELP_STRING([--enable-python],
                        [Build libgweather python bindings])],
        [enable_python=yes],
        [enable_python=no])

That's impossible to disable python support if --disable-support is given on
the command line.
We use a function called "use_enable" in ebuilds (on gentoo), which returns
"--enable-foo" if "foo" support is activated (in USE-flags) or "--disable-foo"
if "foo" is disabled.
The user is finally able to set/uset an optionnal supports dynamically.

This problem is a bit annoying, because when python support is disabled in
USE-flags, python dependencies aren't pulled in the graph dep, so the
compilation fails.

Now have a look at http://www.gentoo.org/proj/en/qa/automagic.xml to understand
in more details why automagic is so bad.

You will find in attachment a patch to fix this issue.
This upstream refers to downstream bug https://bugs.gentoo.org/285595.

Romain.