AM_CONDITIONAL(HAVE_WINDRES, test "x$WINDRES" != "x:")
AC_SUBST(WINDRES)
+AM_CONDITIONAL([EXTERNAL_PREFIX], [test "x$prefix" != "xNONE"])
+
dnl reasonable guesses for where stuff is installed
if test "x$prefix" = "xNONE"; then
prefix="/usr/local"
AC_DEFINE_UNQUOTED(GQ_HELPDIR, "$readmedir", [Location of documentation files])
AC_DEFINE_UNQUOTED(GQ_HTMLDIR, "$htmldir", [Location of html documentation])
-AC_PATH_PROG(GNOME_DOC_TOOL, gnome-doc-tool)
+AC_PATH_PROG(GNOME_DOC_TOOL, yelp-build)
AC_SUBST(readmedir)
AC_SUBST(htmldir)