--- boost/config/platform/bsd.hpp.orig	2008-08-21 02:04:16.000000000 -0600
+++ boost/config/platform/bsd.hpp	2008-08-21 07:03:40.000000000 -0600
@@ -36,7 +36,8 @@
 // FreeBSD 3.x has pthreads support, but defines _POSIX_THREADS in <pthread.h>
 // and not in <unistd.h>
 //
-#if (defined(__FreeBSD__) && (__FreeBSD__ <= 3)) || defined(__OpenBSD__)
+#if (defined(__FreeBSD__) && (__FreeBSD__ <= 3)) || defined(__OpenBSD__) \
+    || defined(__DragonFly__)
 #  define BOOST_HAS_PTHREADS
 #endif
 
@@ -55,13 +56,13 @@
 #endif
 
 #if !((defined(__FreeBSD__) && (__FreeBSD__ >= 5)) \
-      || (__NetBSD_GCC__ >= 2095003))
+      || (__NetBSD_GCC__ >= 2095003) || defined(__DragonFly__))
 #  define BOOST_NO_CWCHAR
 #endif
 //
 // The BSD <ctype.h> has macros only, no functions:
 //
-#if !defined(__OpenBSD__)
+#if !defined(__OpenBSD__) && !defined(__DragonFly__)
 #  define BOOST_NO_CTYPE_FUNCTIONS
 #endif