Hey,

when I cloned the repository this afternoon I found an issue building gpm with hal support, see yourself:

  CC     gnome_power_preferences-gpm-prefs.o
  CC     gnome_power_preferences-gpm-prefs-core.o
  CC     gnome_power_statistics-gpm-statistics.o
  CC     gnome_power_statistics-gpm-point-obj.o
  CC     gnome_power_statistics-gpm-graph-widget.o
  AR     libgpmshared.a
gpm-brightness-hal.c: In function ‘gpm_brightness_hal_init’:
gpm-brightness-hal.c:498: erreur: ‘error’ undeclared (first use in this function)
gpm-brightness-hal.c:498: erreur: (Each undeclared identifier is reported only once
gpm-brightness-hal.c:498: erreur: for each function it appears in.)
make[3]: *** [gnome_power_manager-gpm-brightness-hal.o] Erreur 1
make[3]: *** Attente des tâches non terminées....
gpm-prefs-core.c:862: attention : ‘gpm_prefs_set_defaults_cb’ defined but not used
make[3]: quittant le répertoire « /var/tmp/portage/gnome-extra/gnome-power-manager-9999/work/gnome-power-manager-9999/src »
make[2]: *** [all] Erreur 2
make[2]: quittant le répertoire « /var/tmp/portage/gnome-extra/gnome-power-manager-9999/work/gnome-power-manager-9999/src »
make[1]: *** [all-recursive] Erreur 1
make[1]: quittant le répertoire « /var/tmp/portage/gnome-extra/gnome-power-manager-9999/work/gnome-power-manager-9999 »
make: *** [all] Erreur 2

The fix is pretty trivial, you just forgot to declare "error" (GError *),
see the attached patch.

Regards,
mrpouet