configure.ac

[Bob Lockie]

I am trying to create a configure.ac but I'm having trouble.

When I put the following code in I get a warning.
----------------------------------------
if test "x$enable_ogglibs" = xyes; then
    dnl Libraries required for reading ogg tags, if not found 
'enable_ogglibs' is disabled
    AC_CHECK_LIB(ogg, ogg_sync_init, , enable_ogglibs=no)
    AC_CHECK_LIB(vorbis, vorbis_comment_init, , enable_ogglibs=no)
    AC_CHECK_LIB(vorbisfile, ov_open, , enable_ogglibs=no)
fi
----------------------------------------
warning: AC_ARG_PROGRAM was called before AC_CANONICAL_TARGET


I think the code is supposed to check for the existence of the libvorbis 
library.
What does the "x" mean?
1. Can anybody point me to a tutorial on shell programming?
2. Does anybody know what this error means.
I've searched the web but I haven't found a good tutorial on autoconf yet.



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