src_ug_book = $(dir $(realpath $(dir $(build_ug_book))/ug-book.xml.in))ug-book.xml
ifneq "$(build_ug_book)" "$(src_ug_book)"
$(src_ug_book) : $(build_ug_book)
src_ug_book = $(dir $(realpath $(dir $(build_ug_book))/ug-book.xml.in))ug-book.xml
ifneq "$(build_ug_book)" "$(src_ug_book)"
$(src_ug_book) : $(build_ug_book)