diff -ur a/macros/boost.m4 b/macros/boost.m4
--- a/macros/boost.m4	2012-09-03 17:11:43.000000000 +0200
+++ b/macros/boost.m4	2012-10-16 01:58:28.000000000 +0200
@@ -37,7 +37,7 @@
   boost_headers="detail/lightweight_mutex.hpp thread/thread.hpp multi_index_container.hpp multi_index/key_extractors.hpp thread/mutex.hpp program_options/options_description.hpp iostreams/stream.hpp"
   dnl this is a list of *required* libraries. If any of these are missing, this
   dnl test will return a failure, and Gnash won't build.
-  boost_libs="thread program_options iostreams"
+  boost_libs="thread program_options iostreams system"

   dnl this is a list of *recommended* libraries. If any of these are missing, this
   dnl test will return a warning, and Gnash will build, but testing won't work.
diff -ur a/plugin/npapi/Makefile.am b/plugin/npapi/Makefile.am
--- a/plugin/npapi/Makefile.am	2012-09-03 17:11:43.000000000 +0200
+++ b/plugin/npapi/Makefile.am	2012-10-16 01:58:57.000000000 +0200
@@ -78,7 +78,7 @@

 libgnashplugin_la_LIBADD   = \
	$(GLIB_LIBS) \
-	-lboost_iostreams \
+	$(BOOST_LIBS) \
	$(NULL)
 
 # Scriptable plugin support