https://github.com/wojdyr/xylib/issues/4
https://github.com/wojdyr/xylib/commit/eb40b1cd39c2d2bcac255bafba1f848975cb0bb0
--- configure.orig	2013-08-01 18:54:08.000000000 -0500
+++ configure	2013-11-14 05:26:16.000000000 -0600
@@ -15846,9 +15846,9 @@
 # in this header would cause problems in programs using xylib.
 uses_tr1_memory=`grep '#define XYLIB_USE_TR1_MEMORY ' $srcdir/xylib/cache.h | sed 's/.*\([01]\)/\1/g'`
 if test "$ac_cv_header_tr1_memory" = "yes" && test $uses_tr1_memory != "1"; then
-    sed -i 's/\(#define XYLIB_USE_TR1_MEMORY\) 0/\1 1/' $srcdir/xylib/cache.h
+    sed -i.bak 's/\(#define XYLIB_USE_TR1_MEMORY\) 0/\1 1/' $srcdir/xylib/cache.h
 elif test "$ac_cv_header_tr1_memory" != "yes" && test $uses_tr1_memory = "1"; then
-    sed -i 's/\(#define XYLIB_USE_TR1_MEMORY\) 1/\1 0/' $srcdir/xylib/cache.h
+    sed -i.bak 's/\(#define XYLIB_USE_TR1_MEMORY\) 1/\1 0/' $srcdir/xylib/cache.h
 fi
 
 # this is used in Makefile.am to define XYLIB_DLL when building xyconv