-PKG_CHECK_MODULES(GLIB, glib-2.0)
-PKG_CHECK_MODULES(GIS, libgis = $VERSION)
+PKG_CHECK_MODULES(GLIB, glib-2.0)
+PKG_CHECK_MODULES(GRITS, grits >= 0.6)
+
+# Check for gpsd support
+AC_CHECK_LIB(gps, gps_open, GPS_LIBS="-lgps")
+AM_CONDITIONAL(HAVE_GPSD, test "$GPS_LIBS" != "")
+AC_DEFINE([HAVE_GPSD], [1], [GPSD support])
+AC_SUBST(GPS_LIBS)