--- config.h.in.orig    2013-01-11 12:43:59.748000001 +0000
+++ config.h.in 2013-01-11 12:44:29.988000001 +0000
@@ -91,3 +91,5 @@
 # ifndef HAVE_STRTOL
 long strtol(const char *, char **, int);
 # endif
+
+#define USE_INTERP_RESULT 1