diff -Nru inventor-2.1.5-10/debian/rules inventor-2.1.5-10/debian/rules
--- inventor-2.1.5-10/debian/rules	2011-09-25 05:15:32.000000000 +0200
+++ inventor-2.1.5-10/debian/rules	2013-08-29 23:33:43.000000000 +0200
@@ -30,6 +30,11 @@
 
 export VCXXOPTS=$(VCOPTS)
 
+# Set linking flags.
+# These options are controlled by the variable VLDOPTS;
+# see setting of "LDFLAGS" in make/commondefs for details. 
+export VLDOPTS=-Wl,--as-needed
+
 # Sadly, the program "ivman" used to generate manual pages
 # is broken on several architectures.  It looks to me like
 # there are assumptions being made about the form of mangled