typedef int os_vm_prot_t;
typedef int os_context_register_t;
+#if defined __OpenBSD__
+/* name defined for compatibility between OpenBSD 3.1 sigaltstack(2) and
+ * Linux sigaltstack(2) */
+typedef struct sigaltstack stack_t;
+#elif defined __FreeBSD__
+/* FreeBSD 4.6 already has stack_t defined. */
+#endif
+
#if defined __FreeBSD__
/* Note: The man page for sigaction(2) in FreeBSD 4.0 says that this
* is an mcontext_t, but according to comments by Raymond Wiker in the
* original FreeBSD port of SBCL, that's wrong, it's actually a
* ucontext_t. */
+#include <sys/ucontext.h>
typedef ucontext_t os_context_t;
/* As the sbcl-devel message from Raymond Wiker 2000-12-01, FreeBSD
* (unlike Linux and OpenBSD) doesn't let us tweak the CPU's single