AC_DEFUN([FA_PROG_SWIG], [
AC_ARG_WITH(swig,
[AS_HELP_STRING([--with-swig=<bin>], [use SWIG binary <bin>])])
case $with_swig in
"") SWIG_BIN=swig ;;
*) SWIG_BIN="$with_swig"
esac
AC_CHECK_PROG(SWIG, $SWIG_BIN, $SWIG_BIN)
AC_SUBST(SWIG)
])