pantheon-greeter fails to build from source on fedora

[Fabio Valentini]

pantheon-greeter fails to build from source on fedora 24.

The following errors occur during build:

/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:2.5-2.47: error: `Constants' already contains a definition for `DATADIR'
    public const string DATADIR = "/usr/share";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:2.5-2.47: note: previous definition of `DATADIR' was here
    public const string DATADIR = "/usr/share";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:3.5-3.67: error: `Constants' already contains a definition for `PKGDATADIR'
    public const string PKGDATADIR = "/usr/share/pantheon-greeter";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:3.5-3.67: note: previous definition of `PKGDATADIR' was here
    public const string PKGDATADIR = "/usr/share/pantheon-greeter";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:4.5-4.45: error: `Constants' already contains a definition for `GETTEXT_PACKAGE'
    public const string GETTEXT_PACKAGE = "";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:4.5-4.45: note: previous definition of `GETTEXT_PACKAGE' was here
    public const string GETTEXT_PACKAGE = "";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:5.5-5.42: error: `Constants' already contains a definition for `RELEASE_NAME'
    public const string RELEASE_NAME = "";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:5.5-5.42: note: previous definition of `RELEASE_NAME' was here
    public const string RELEASE_NAME = "";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:6.5-6.42: error: `Constants' already contains a definition for `VERSION'
    public const string VERSION = "3.0.0";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:6.5-6.42: note: previous definition of `VERSION' was here
    public const string VERSION = "3.0.0";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:7.5-7.42: error: `Constants' already contains a definition for `VERSION_INFO'
    public const string VERSION_INFO = "";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:7.5-7.42: note: previous definition of `VERSION_INFO' was here
    public const string VERSION_INFO = "";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:8.5-8.39: error: `Constants' already contains a definition for `PLUGINDIR'
    public const string PLUGINDIR = "";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:8.5-8.39: note: previous definition of `PLUGINDIR' was here
    public const string PLUGINDIR = "";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:9.5-9.50: error: `Constants' already contains a definition for `CONF_DIR'
    public const string CONF_DIR = "/etc/lightdm";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/builddir/build/BUILD/pantheon-greeter-3.0/src/config.vala:9.5-9.50: note: previous definition of `CONF_DIR' was here
    public const string CONF_DIR = "/etc/lightdm";
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Compilation failed: 8 error(s), 5 warning(s)
CMakeFiles/pantheon-greeter.dir/build.make:83: recipe for target 'src/Authenticator.c' failed

[Zisu Andrei (matzipan)]

Hey Fabio,

I think you forgot the "mkdir build && cd build" part of the building process.