--- src/external/sixseries/CMakeLists.txt.orig	2016-02-14 00:01:30 UTC
+++ src/external/sixseries/CMakeLists.txt
@@ -10,3 +10,5 @@ s_copy.c
 s_stop.c
 f2c.h
 )
+
+set_target_properties( sixseries PROPERTIES COMPILE_FLAGS "-fPIC")