diff --git a/build/Jamfile.v2 b/build/Jamfile.v2
index 9166ac3..bda7987 100644
--- a/build/Jamfile.v2
+++ b/build/Jamfile.v2
@@ -7,6 +7,7 @@
 # See library home page at http://www.boost.org/libs/filesystem
 
 project boost/filesystem
+    : requirements <host-os>hpux,<toolset>gcc:<define>_INCLUDE_STDC__SOURCE_199901
     : source-location ../src
     : usage-requirements # pass these requirement to dependents (i.e. users)
       <link>shared:<define>BOOST_FILESYSTEM_DYN_LINK=1