diff -rup boost_1_42_0.orig/boost/config/compiler/gcc.hpp boost_1_42_0/boost/config/compiler/gcc.hpp
--- boost_1_42_0.orig/boost/config/compiler/gcc.hpp	2010-04-03 00:03:31.782604076 +0200
+++ boost_1_42_0/boost/config/compiler/gcc.hpp	2010-04-03 00:53:35.534114084 +0200
@@ -79,7 +79,7 @@
 // those platforms where we can know for sure). It will get turned off again
 // later if no threading API is detected.
 //
-#if !defined(__MINGW32__) && !defined(linux) && !defined(__linux) && !defined(__linux__)
+#if !defined(__MINGW32__)
 # define BOOST_HAS_THREADS
 #endif