Automake Yacc Output Filename Quandary

Problem:

I have a project that I am migrating from Solaris / Lex / Yacc to Linux / Flex / Bison + Autotools. I am facing the following problem, and I am wondering if anyone knows how to get around it. For this purpose (only the necessary details are included):

bin_PROGRAMS=my_prog

my_prog_YFLAGS=-d
my_prog_SOURCES=\
   main.cpp \
   parser.ypp \
   scanner.lpp

Automake generates the following source files from lpp and ypp:

• scanner.lpp -> scanner.cpp (according to Automake manual)
• parser.ypp - > my_prog -parser.cpp and my_prog -parser.h (why?)

Attempted Solution:

bison -b -o . , automake, -, (parser.tab.c) script. , , automake , .

- -, ?