--- a/configure.ac
+++ b/configure.ac
@@ -92,7 +92,6 @@
 AC_SUBST(ORCUS_MICRO_VERSION)
 
 BOOST_REQUIRE([1.36])
-BOOST_SYSTEM
 AS_IF([test "x$have_filesystem" != "xyes" -a "x$have_experimental_filesystem" != "xyes"], [
     BOOST_FILESYSTEM
 ])
@@ -250,7 +249,6 @@
 
 AS_IF([test "x$with_tools" != "xno"], [
         BOOST_PROGRAM_OPTIONS
-        BOOST_SYSTEM
 ])
 
 # ============
