--- glibc-2.16.0.orig/manual/texinfo.tex	2012-06-30 21:12:34.000000000 +0200
+++ glibc-2.16.0/manual/texinfo.tex	2012-07-02 01:11:41.500955548 +0200
@@ -1107,7 +1107,7 @@
 % #1 is a control sequence in which to do the replacements,
 % which we \xdef.
 \def\txiescapepdf#1{%
-  \ifx\pdfescapestring\relax
+  \ifx\pdfescapestring\thisisundefined
     % No primitive available; should we give a warning or log?
     % Many times it won't matter.
   \else