Fix syntax

debian/rules

@@ -62,7 +62,7 @@ ifneq ($(APT_DEBVER),)
 .PHONY: configure.in
 configure.in:
 	sed -e 's/$(APT_CONFVER)/$(APT_DEBVER)/' $@ > $@.$$$$ && mv $@.$$$$ $@
-fi
+endif
 else
 configure.in:
 endif