Add BOOST_LINK_SYSTEM flag for explicit libboost_system linking

1 files changed, 8 insertions, 2 deletions

diff --git a/README b/README
index 49e00bb..f206d07 100644
--- a/README
+++ b/README
@@ -21,13 +21,14 @@ the CPPFLAGS and LDFLAGS variables, respectively.
 The build system supports the following variables:
 
 CXX               (defaults to g++ if not set)
+AR                (defaults to ar if not set)
+RANLIB            (defaults to ranlib if not set)
 CPPFLAGS
 CXXFLAGS
 LDFALGS
 LIBS
 BOOST_LIB_SUFFIX
-AR                (defaults to ar if not set)
-RANLIB            (defaults to ranlib if not set)
+BOOST_LINK_SYSTEM
 
 For example:
 
@@ -38,6 +39,11 @@ Boost library suffix. For example, if your Boost library names are
 in the libboost_regex-gcc41-mt-d.so format, then you will need to
 set BOOST_LIB_SUFFIX to -gcc41-mt-d.
 
+The BOOST_LINK_SYSTEM variable allows you to specify whether the
+Boost system library should be explicitly linked to which may be
+required by newer linkers. The valid values are 'y' (default) and 
+'n'.
+
 If you would like to see the full compiler/linker/etc., command lines,
 you can add verbose=1 to the make command line: