diff --git a/configure.ac.original b/configure.ac
index 8997eb9..8613429 100644
+++ b/configure.ac
--- a/configure.ac.original
@@ -245,8 +245,7 @@ AM_CONDITIONAL([with_static_enabled], [test xyes = x$enable_static])
                                 dnl  cross-platform C++ extensions
 AS_IF([test xyes != x$with_included_boost],
   [AX_BOOST_BASE([1.49.0],
-     [AX_BOOST_SYSTEM
-      AX_BOOST_FILESYSTEM
+     [AX_BOOST_FILESYSTEM
       AX_BOOST_IOSTREAMS
       AX_BOOST_PROGRAM_OPTIONS
       AS_IF([test $__cplusplus -lt 201103], [AX_BOOST_REGEX])
@@ -270,7 +269,6 @@ AS_IF([test xyes = x$with_included_boost],
       aux_dir=`echo $ac_aux_dir | sed "s,^$srcdir/,,"`
       BOOST_CPPFLAGS="-I\$(top_srcdir)/$aux_dir/boost"
       BOOST_LDFLAGS="-L\$(top_builddir)/$aux_dir/boost/lib"
-      BOOST_SYSTEM_LIB=-lboost_system
       BOOST_FILESYSTEM_LIB=-lboost_filesystem
       BOOST_IOSTREAMS_LIB=-lboost_iostreams
       BOOST_PROGRAM_OPTIONS_LIB=-lboost_program_options
@@ -324,7 +322,7 @@ AS_IF([test xyes = x$with_boost_unit_test_framework],
 #  Work around implicit dependencies on Boost.System through the use
 #  of Boost.Filesystem in several locations.
 
-BOOST_FILESYSTEM_LIB="$BOOST_FILESYSTEM_LIB $BOOST_SYSTEM_LIB"
+BOOST_FILESYSTEM_LIB="$BOOST_FILESYSTEM_LIB"
 
                                 dnl  documentation generation tools
 AC_CHECK_PROGS([DOXYGEN], [doxygen])