diff -urN liborcus-0.5.1/src/parser/Makefile.am liborcus-0.5.1.new/src/parser/Makefile.am
--- liborcus-0.5.1/src/parser/Makefile.am	2013-04-12 16:25:03.000000000 +0200
+++ liborcus-0.5.1.new/src/parser/Makefile.am	2013-04-23 19:45:47.794480191 +0200
@@ -20,7 +20,8 @@
 
 liborcus_parser_@ORCUS_API_VERSION@_la_LDFLAGS = -no-undefined
 liborcus_parser_@ORCUS_API_VERSION@_la_LIBADD = \
-	 $(ZLIB_LIBS)
+	$(BOOST_SYSTEM_LIB) \
+	$(ZLIB_LIBS)
 
 EXTRA_PROGRAMS = \
 	parser-test-string-pool \