This was added ahead of time (for next version), currently unused.
--- a/configure.ac
+++ b/configure.ac
@@ -249,16 +249,4 @@
 dnl libt4kcommon is now required: --------------------------------------------
 
-PKG_CHECK_MODULES([T4K_COMMON],
-	[t4k_common],
-	[],
-	[AC_MSG_NOTICE([t4k_common not located by pkg-config, checking with AC CHECK LIB:])
-	 AC_CHECK_LIB([t4k_common],
-		[InitT4KCommon],
-		[],
-		[AC_MSG_ERROR([libt4k_common is required: git://git.debian.org/tux4kids/t4kcommon.git])])])
-
-AC_DEFINE([HAVE_LIBT4K_COMMON],[1],[Define to 1 if you have the `t4k_common` library])
-CFLAGS="$CFLAGS $T4K_COMMON_CFLAGS"
-LIBS="$LIBS $T4K_COMMON_LIBS"