diff -Naur libtorrent-0.12.5/src/data/memory_chunk.cc libtorrent-0.12.5.patched/src/data/memory_chunk.cc
--- libtorrent-0.12.5/src/data/memory_chunk.cc	2008-10-07 08:49:49.000000000 -0400
+++ libtorrent-0.12.5.patched/src/data/memory_chunk.cc	2009-10-29 23:56:17.017952666 -0400
@@ -46,6 +46,14 @@
 #include "torrent/exceptions.h"
 #include "memory_chunk.h"
 
+#ifdef __sun__
+extern "C" int madvise(void *, size_t, int);
+//#include <sys/mman.h>
+//Should be the include line instead, but Solaris
+//has an annoying bug wherein it doesn't declare
+//madvise for C++.
+#endif
+
 namespace torrent {
 
 uint32_t MemoryChunk::m_pagesize = getpagesize();