How can variant B imply variant A?

[Daniel J. Luke]

On Aug 22, 2012, at 3:23 AM, Mojca Miklavec <mojca.miklavec.lists at gmail.com> wrote:
> If I use
>    variant x_wxt ... {
>        if {<something>} {
>            # then this is already too late to make a dependency on "wxWidgets"
>        } else {
>            # or dependency on "wxWidgets-devel" here
>        }
>    }

What do you mean? do you mean you can't add an extra 'default' variant there?

You certainly can add (and/or remove) dependencies inside of variants.

For example, in the subversion port +mod_dav_svn does:

variant mod_dav_svn 	description {Install the subversion apache module (mod_dav_svn)} {
			depends_build path:apache2/bin/apxs:apache2
			configure.args-append \
				--with-apxs=${prefix}/apache2/bin/apxs \
				--disable-mod-activation
			configure.args-delete --without-apxs

			destroot.violate_mtree yes
			}

--
Daniel J. Luke                                                                   
+========================================================+                        
| *---------------- dluke at geeklair.net ----------------* |                          
| *-------------- http://www.geeklair.net -------------* |                          
+========================================================+                        
|   Opinions expressed are mine and do not necessarily   |                          
|          reflect the opinions of my employer.          |                          
+========================================================+