Code shamelessly taken from netbsd tremor-tools.

Ugly autoconf/libtool hack should be blamed on me.

diff -urN vorbis-tools-1.0.1/configure.in vorbis-tools-1.0.1-tremor/configure.in
--- vorbis-tools-1.0.1/configure.in	2003-10-23 09:56:36.000000000 +0200
+++ vorbis-tools-1.0.1-tremor/configure.in	2005-05-17 17:04:14.000000000 +0200
@@ -98,8 +98,8 @@
 dnl Check for generally needed libraries
 dnl --------------------------------------------------
 
-XIPH_PATH_OGG(,AC_MSG_ERROR(Ogg needed!))
-XIPH_PATH_VORBIS(,AC_MSG_ERROR(Vorbis needed!))
+#XIPH_PATH_OGG(,AC_MSG_ERROR(Ogg needed!))
+#XIPH_PATH_VORBIS(,AC_MSG_ERROR(Vorbis needed!))
 
 SHARE_LIBS='$(top_builddir)/share/libutf8.a $(top_builddir)/share/libgetopt.a'
 SHARE_CFLAGS='-I$(top_srcdir)/include'
@@ -118,8 +118,8 @@
 
 if test "x$build_ogg123" = xyes; then
   AC_MSG_RESULT([checking for ogg123 requirements])
-  XIPH_PATH_AO(,build_ogg123=no; AC_MSG_WARN(libao missing))
-  AM_PATH_CURL(,build_ogg123=no; AC_MSG_WARN(libcurl missing))
+  #XIPH_PATH_AO(,build_ogg123=no; AC_MSG_WARN(libao missing))
+  #AM_PATH_CURL(,build_ogg123=no; AC_MSG_WARN(libcurl missing))
 
   ACX_PTHREAD(,build_ogg123=no; AC_MSG_WARN(POSIX threads missing))
 fi
diff -urN vorbis-tools-1.0.1/ltmain.sh vorbis-tools-1.0.1-tremor/ltmain.sh
--- vorbis-tools-1.0.1/ltmain.sh	2003-08-02 23:35:16.000000000 +0200
+++ vorbis-tools-1.0.1-tremor/ltmain.sh	2005-05-17 16:58:25.000000000 +0200
@@ -1318,8 +1318,8 @@
     else
       shlib_search_path=
     fi
-    eval sys_lib_search_path=\"$sys_lib_search_path_spec\"
-    eval sys_lib_dlsearch_path=\"$sys_lib_dlsearch_path_spec\"
+    #eval sys_lib_search_path=\"$sys_lib_search_path_spec\"
+    #eval sys_lib_dlsearch_path=\"$sys_lib_dlsearch_path_spec\"
 
     output_objdir=`$echo "X$output" | $Xsed -e 's%/[^/]*$%%'`
     if test "X$output_objdir" = "X$output"; then
diff -urN vorbis-tools-1.0.1/ogg123/Makefile.in vorbis-tools-1.0.1-tremor/ogg123/Makefile.in
--- vorbis-tools-1.0.1/ogg123/Makefile.in	2003-11-17 17:50:56.000000000 +0100
+++ vorbis-tools-1.0.1-tremor/ogg123/Makefile.in	2005-05-17 17:24:43.000000000 +0200
@@ -107,7 +107,7 @@
 OGG123_SPEEX_OBJS = @OGG123_SPEEX_OBJS@
 OGGENC_FLAC_OBJS = @OGGENC_FLAC_OBJS@
 OGG_CFLAGS = @OGG_CFLAGS@
-OGG_LIBS = @OGG_LIBS@
+OGG_LIBS = -logg
 OPT_SUBDIRS = @OPT_SUBDIRS@
 PACKAGE = @PACKAGE@
 POFILES = @POFILES@
@@ -125,10 +125,10 @@
 USE_INCLUDED_LIBINTL = @USE_INCLUDED_LIBINTL@
 USE_NLS = @USE_NLS@
 VERSION = @VERSION@
-VORBISENC_LIBS = @VORBISENC_LIBS@
-VORBISFILE_LIBS = @VORBISFILE_LIBS@
-VORBIS_CFLAGS = @VORBIS_CFLAGS@
-VORBIS_LIBS = @VORBIS_LIBS@
+VORBISENC_LIBS = 
+VORBISFILE_LIBS = 
+VORBIS_CFLAGS = 
+VORBIS_LIBS = -lvorbisidec
 am__include = @am__include@
 am__quote = @am__quote@
 install_sh = @install_sh@
@@ -141,16 +141,15 @@
 
 bin_PROGRAMS = ogg123
 
-INCLUDES = @OGG_CFLAGS@ @VORBIS_CFLAGS@ @AO_CFLAGS@ @CURL_CFLAGS@ \
+INCLUDES =  @CURL_CFLAGS@ \
            @PTHREAD_CFLAGS@ @SHARE_CFLAGS@ @I18N_CFLAGS@
 
 
 ogg123_LDADD = @OGG123_FLAC_OBJS@ @OGG123_SPEEX_OBJS@ @SHARE_LIBS@ \
-	       @VORBISFILE_LIBS@ @VORBIS_LIBS@ @OGG_LIBS@ @AO_LIBS@ \
+               -lvorbisidec -logg -lao -ldl  \
                @SOCKET_LIBS@ @LIBICONV@ @CURL_LIBS@ @PTHREAD_CFLAGS@ \
                @PTHREAD_LIBS@ @I18N_LIBS@ @FLAC_LIBS@ @SPEEX_LIBS@
 
-
 ogg123_DEPENDENCIES = @OGG123_FLAC_OBJS@ @OGG123_SPEEX_OBJS@ @SHARE_LIBS@
 ogg123_SOURCES = audio.c buffer.c callbacks.c \
                 cfgfile_options.c cmdline_options.c \
diff -urN vorbis-tools-1.0.1/ogg123/ogg123.c vorbis-tools-1.0.1-tremor/ogg123/ogg123.c
--- vorbis-tools-1.0.1/ogg123/ogg123.c	2003-09-02 21:37:05.000000000 +0200
+++ vorbis-tools-1.0.1-tremor/ogg123/ogg123.c	2005-05-16 22:29:33.000000000 +0200
@@ -469,6 +469,17 @@
     return;
   }
 
+
+  if ((new_audio_fmt.big_endian != (BYTE_ORDER == BIG_ENDIAN)) ||
+        new_audio_fmt.signed_sample != 1 ||
+        new_audio_fmt.word_size != 2)
+  {
+    /* Tremor can only do big_endian, signed, 16 bit samples */
+    status_error(_("Error, Tremor can only decode signed 16 bit PCM "
+                   "host endian.\n"));
+     return;
+   }
+
   /* Decide which statistics are valid */
   select_stats(stat_format, &options, source, decoder, audio_buffer);
 
diff -urN vorbis-tools-1.0.1/ogg123/oggvorbis_format.c vorbis-tools-1.0.1-tremor/ogg123/oggvorbis_format.c
--- vorbis-tools-1.0.1/ogg123/oggvorbis_format.c	2003-06-24 14:34:40.000000000 +0200
+++ vorbis-tools-1.0.1-tremor/ogg123/oggvorbis_format.c	2005-05-16 22:28:37.000000000 +0200
@@ -20,8 +20,8 @@
 #include <string.h>
 #include <ctype.h>
 #include <ogg/ogg.h>
-#include <vorbis/codec.h>
-#include <vorbis/vorbisfile.h>
+#include <tremor/ivorbiscodec.h>
+#include <tremor/ivorbisfile.h>
 #include "transport.h"
 #include "format.h"
 #include "vorbis_comments.h"
@@ -136,8 +136,7 @@
   while (nbytes > 0) {
 
     old_section = priv->current_section;
-    ret = ov_read(&priv->vf, ptr, nbytes, audio_fmt->big_endian,
-		  audio_fmt->word_size, audio_fmt->signed_sample,
+    ret = ov_read(&priv->vf, ptr, nbytes,
 		  &priv->current_section);
 
     if (ret == 0) {
@@ -179,15 +178,16 @@
 }
 
 
-int ovf_seek (decoder_t *decoder, double offset, int whence)
+int ovf_seek (decoder_t *decoder, double aoffset, int whence)
 {
   ovf_private_t *priv = decoder->private;
   int ret;
-  double cur;
+  ogg_int64_t cur;
+  ogg_int64_t offset = (aoffset * 1000);
 
   if (whence == DECODER_SEEK_CUR) {
     cur = ov_time_tell(&priv->vf);
-    if (cur >= 0.0)
+    if (cur >= 0)
       offset += cur;
     else
       return 0;
diff -urN vorbis-tools-1.0.1/ogg123/vorbis_comments.c vorbis-tools-1.0.1-tremor/ogg123/vorbis_comments.c
--- vorbis-tools-1.0.1/ogg123/vorbis_comments.c	2003-06-24 14:37:52.000000000 +0200
+++ vorbis-tools-1.0.1-tremor/ogg123/vorbis_comments.c	2005-05-17 16:22:53.000000000 +0200
@@ -20,8 +20,8 @@
 #include <string.h>
 #include <ctype.h>
 #include <ogg/ogg.h>
-#include <vorbis/codec.h>
-#include <vorbis/vorbisfile.h>
+#include <tremor/ivorbiscodec.h>
+#include <tremor/ivorbisfile.h>
 #include "format.h"
 #include "utf8.h"
 #include "i18n.h"