Index: /trunk/ccl/compiler/X86/X8664/x8664-backend.lisp
===================================================================
--- /trunk/ccl/compiler/X86/X8664/x8664-backend.lisp	(revision 4821)
+++ /trunk/ccl/compiler/X86/X8664/x8664-backend.lisp	(revision 4822)
@@ -220,4 +220,5 @@
                 :define-callback 'define-x8664-callback
                 :defcallback-body 'defcallback-body-x8664
+                :platform-syscall-mask (logior platform-os-freebsd platform-cpu-x86 platform-word-size-64)                
                 ))