Start teh whole thing with 

  ./bootstrap

Necessary files are:

bootstrap
configure.ac
scripts/makefdeps.py
mpi_filter
Makefile.am
NEWS
README
AUTHORS
COPYING
ChangeLog
config/
m4/acx_mpi.m4
m4/fortran.m4
m4/pkg.m4
doc/Makefile.am
doc/man/Makefile.am
doc/man/xbeach.texinfo
doc/man/copying.texinfo