- $(INSTALL) -d $(INSTALL_DIR)/include/GL
- $(INSTALL) -d $(INSTALL_DIR)/$(LIB_DIR)
- $(INSTALL) -m 644 $(TOP)/include/GL/*.h $(INSTALL_DIR)/include/GL
+ $(INSTALL) -d $(DESTDIR)$(INSTALL_DIR)/include/GL
+ $(INSTALL) -d $(DESTDIR)$(INSTALL_DIR)/$(LIB_DIR)
+ $(INSTALL) -m 644 $(TOP)/include/GL/*.h $(DESTDIR)$(INSTALL_DIR)/include/GL