(Gnu) make: multiple targets with special compiler switches

I have a problem getting a makefile to work. I have several parsers that compile XML schemas as follows:

$(srcdir)/schema_1_parser.cpp: \
                 $(srcdir)/schema_1_parser.l \
                 $(srcdir)/schema_1_parser.tab.cpp
    $(LEX) -Pschema_1 -o$(srcdir)/schema_1_parser.cpp \
                        $(srcdir)/schema_1_parser.l

$(srcdir)/schema_1_parser.tab.cpp $(srcdir)/schema_1_parser.tab.hpp: \
                $(srcdir)/schema_1_parser.y
    $(YACC) -ldv -p schema_1 -o $(srcdir)/schema_1_parser.tab.cpp \
                                $(srcdir)/schema_1_parser.y

(There are multiple such rule pairs.)

I added the second target $(srcdir)/schema_1_parser.tab.hpp because of a makefile error "Do not know how to make schema_1_parser.tab.hpp", even though the header gets generated automatically together with the .tab.cpp file.

Now the bison parser is being called twice. I read up on this and am given to believe that this is expected behavior for special rules with multiple targets, and that I should use pattern rules instead. However, I am a bit unsure what about the command line options -Pschema_1 for flex and -p schema_1 for bison. Can I use the pattern to take care of those also? (My experience has been negative, but I may be missing something else.)