Broken example in autoconf manual

[Max Horn]

Hi there,

on https://www.gnu.org/software/autoconf/manual/autoconf.html#Using-System-Type

this example is given:

     case $host in
       alpha*-*-*)   AC_CONFIG_LINKS([dither.c:alpha/dither.c]) ;;
       powerpc*-*-*) AC_CONFIG_LINKS([dither.c:powerpc/dither.c]) ;;
       *-*-*)        AC_CONFIG_LINKS([dither.c:generic/dither.c]) ;;
     esac

But that doesn't actually work; inserting it into configure.ac leads to this 
error:

configure.ac:396: error: `dither.c' is already registered with AC_CONFIG_LINKS.
../../lib/autoconf/status.m4:921: AC_CONFIG_LINKS is expanded from...
configure.ac:396: the top level
autom4te-2.69: /usr/bin/m4 failed with exit status: 1


Which leaves me wondering how to achieve equivalent behavior correctly?


Cheers,
Max