ac_prog_scp

Check for the program 'scp', let script continue if exists, pops up error message if not.

Besides checking existence, this macro also set these environment variables upon completion:

     SCP = which scp

AC_DEFUN([AC_PROG_SCP],[
AC_REQUIRE([AC_EXEEXT])dnl
AC_PATH_PROG(SCP, scp$EXEEXT, nocommand)
if test "$SCP" = nocommand; then
        AC_MSG_ERROR([scp not found in $PATH])
fi;dnl
])