Index: trunk/src/hid_cam.c
===================================================================
--- trunk/src/hid_cam.c	(revision 27677)
+++ trunk/src/hid_cam.c	(revision 27678)
@@ -357,10 +357,13 @@
 				*next = '\0';
 				next++;
 			}
+			if (strcmp(curr, "okempty") == 0)
+				dst->okempty = 1;
+			else
+				pcb_message(PCB_MSG_ERROR, "CAM: ignoring unknown global parameter [%s]\n", curr);
 		}
 		else
 			*str = NULL;
-printf("cam GLOBAL: '%s'\n", curr);
 	}
 }
 
Index: trunk/src/hid_cam.h
===================================================================
--- trunk/src/hid_cam.h	(revision 27677)
+++ trunk/src/hid_cam.h	(revision 27678)
@@ -19,6 +19,8 @@
 	pcb_xform_t *vxform[PCB_VLY_end];
 	pcb_xform_t vxform_[PCB_VLY_end];
 
+	unsigned int okempty:1;        /* do not warn if no group/object exported */
+
 	/* private/internal/cache */
 	const char *fn_template;
 	char *fn_last;