diff --git a/m4/theora.m4 b/m4/theora.m4
new file mode 100644
index 00000000..2a800f84
--- /dev/null
+++ b/m4/theora.m4
@@ -0,0 +1,69 @@
+# Configure paths for libtheora
+# Karl Heyes 02-Feb-2004
+
+dnl XIPH_PATH_THEORA([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
+dnl Test for libtheora, and define THEORA_CFLAGS THEORA_LIBS
+dnl
+
+AC_DEFUN([XIPH_PATH_THEORA],
+[
+XIPH_PATH_OGG([$1],[$2])
+
+dnl Get the cflags and libraries for theora
+dnl
+AC_ARG_VAR([THEORA],[path to theora installation])
+AC_ARG_WITH(theora,
+    AC_HELP_STRING([--with-theora=PREFIX],
+        [Prefix where libtheora is installed (optional)]),
+    theora_prefix="$withval",
+    theora_prefix="$THEORA_PREFIX"
+    )
+if test "x$theora_prefix" = "x"; then
+    if test "x$prefix" = "xNONE"; then
+        theora_prefix="/usr/local"
+    else
+        theora_prefix="$prefix"
+    fi
+fi
+
+THEORA_CFLAGS="$OGG_CFLAGS"
+THEORA_LDFLAGS="$OGG_LDFLAGS"
+if test "x$theora_prefix" != "x$ogg_prefix"; then
+    XIPH_GCC_WARNING(-I"$theora_prefix/include",,
+            [THEORA_CFLAGS="$THEORA_CFLAGS -I$theora_prefix/include"
+            THEORA_LDFLAGS="-L$theora_prefix/lib $THEORA_LDFLAGS"
+            ])
+fi
+
+THEORA_LIBS="-ltheora"
+
+ac_save_LIBS="$LIBS"
+ac_save_LDFLAGS="$LDFLAGS"
+LDFLAGS="$LDFLAGS $THEORA_LDFLAGS"
+LIBS="$LIBS $THEORA_LIBS"
+xt_have_theora="yes"
+AC_MSG_CHECKING([for libtheora])
+AC_TRY_LINK_FUNC(ogg_stream_init, [AC_MSG_RESULT([ok])],
+        [LIBS="$LIBS $OGG_LIBS"
+        AC_TRY_LINK_FUNC(ogg_stream_init,
+            [THEORA_LIBS="$THEORA_LIBS $OGG_LIBS"],
+            [xt_have_theora="no"])
+        ])
+
+LIBS="$ac_save_LIBS"
+LDFLAGS="$ac_save_LDFLAGS"
+
+if test "x$xt_have_theora" = "xyes"
+then
+    AC_MSG_RESULT([ok])
+    AC_DEFINE([HAVE_THEORA],[1],[Define if Theora support is available])
+else
+    ifelse([$2], , AC_MSG_ERROR([Unable to link to libtheora]), [$2])
+    THEORA_CFLAGS=""
+    THEORA_LDFLAGS=""
+    THEORA_LIBS=""
+fi
+AC_SUBST(THEORA_CFLAGS)
+AC_SUBST(THEORA_LDFLAGS)
+AC_SUBST(THEORA_LIBS)
+])