Resolving dependencies...
Downloading DBus-0.2...
Configuring DBus-0.2...
checking for pkg-config... no
checking for DBUS... configure: error: The pkg-config script could not be found or is too old.  Make sure it
is in your PATH or set the PKG_CONFIG environment variable to the full
path to pkg-config.

Alternatively, you may set the environment variables DBUS_CFLAGS
and DBUS_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

To get pkg-config, see <http://pkg-config.freedesktop.org/>.
See `config.log' for more details.
Failed to install DBus-0.2
cabal: Error: some packages failed to install:
DBus-0.2 failed during the configure step. The exception was:
ExitFailure 1