--- brlcad-7.10.2.orig/src/other/tk/unix/Makefile	2007-09-15 23:03:39.000000000 -0400
+++ brlcad-7.10.2/src/other/tk/unix/Makefile	2007-09-15 23:09:30.000000000 -0400
@@ -824,18 +824,18 @@
 	    done;
 	@echo "Installing and cross-linking top-level (.1) docs";
 	@for i in $(TOP_DIR)/doc/*.1; do \
-	    $(UNIX_DIR)/installManPage $(MAN_FLAGS) $$i $(MAN1_INSTALL_DIR); \
+	    [ ! -e $(TOP_DIR)/doc/$$i ] || $(UNIX_DIR)/installManPage $(MAN_FLAGS) $(TOP_DIR)/doc/$$i $(MAN1_INSTALL_DIR); \
 	done
 
 	@echo "Installing and cross-linking C API (.3) docs";
 	@for i in $(TOP_DIR)/doc/*.3; do \
-	    $(UNIX_DIR)/installManPage $(MAN_FLAGS) $$i $(MAN3_INSTALL_DIR); \
+	    [ ! -e $(TOP_DIR)/doc/$$i ] || $(UNIX_DIR)/installManPage $(MAN_FLAGS) $(TOP_DIR)/doc/$$i $(MAN3_INSTALL_DIR); \
 	done
 
 	@echo "Installing and cross-linking command (.n) docs";
 	@for i in $(TOP_DIR)/doc/*.n; do \
 	    if [ "ttk_dialog.n" = `basename $$i` ] ; then continue ; fi ; \
-	    $(UNIX_DIR)/installManPage $(MAN_FLAGS) $$i $(MANN_INSTALL_DIR); \
+	    [ ! -e $(TOP_DIR)/doc/$$i ] || $(UNIX_DIR)/installManPage $(MAN_FLAGS) $(TOP_DIR)/doc/$$i $(MANN_INSTALL_DIR); \
 	done