Recent versions of SunOS have POSIX signals.

diff --git a/v7/src/microcode/ux.h b/v7/src/microcode/ux.h
index 4528702cc43182782d2a532f9add538753578f0e..147f9e9bc9ecf7735219568504652672e07b9579 100644 (file)
--- a/v7/src/microcode/ux.h
+++ b/v7/src/microcode/ux.h
@@ -1,6 +1,6 @@
 /* -*-C-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/microcode/ux.h,v 1.26 1991/09/05 22:26:30 markf Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/microcode/ux.h,v 1.27 1991/10/16 00:27:02 cph Exp $
 
 Copyright (c) 1988-91 Massachusetts Institute of Technology
 
@@ -227,6 +227,10 @@ extern void EXFUN (error_system_call, (int code, enum syscall_names name));
 #define VOID_SIGNAL_HANDLERS
 #endif
 
+#if defined(_SUNOS4) && defined(SIG_BLOCK)
+#define HAVE_POSIX_SIGNALS
+#endif
+
 #define ERRNO_NONBLOCK EWOULDBLOCK
 #define FCNTL_NONBLOCK FNDELAY