--- src/swtch.s.orig	Wed Nov  5 15:03:00 1997
+++ src/swtch.s	Sat Jan  9 18:56:46 1999
@@ -136,7 +136,7 @@
 .end	_swtch
 .globl	_ENDMONITOR
 _ENDMONITOR:
-#elif linux && i386
+#elif (linux || unix) && i386
 .align	4
 .globl	__swtch
 .globl	_swtch
@@ -165,7 +165,11 @@
 	pushl	%edi
 	call	*%esi
 	pushl	%eax
+#ifdef __ELF__
 	call	Thread_exit
+#else
+	call	_Thread_exit
+#endif
 .globl	__ENDMONITOR
 .globl	_ENDMONITOR
 __ENDMONITOR: