If st's window is deleted then it will try to send a SIGHUP through kill(2),

therefore pledge(2) needs proc otherwise it will abort due to missing promise.

OK tb@ and sthen@

x11/st/Makefile

@@ -1,9 +1,9 @@
-# $OpenBSD: Makefile,v 1.14 2017/04/05 21:29:57 juanfra Exp $
+# $OpenBSD: Makefile,v 1.15 2017/09/26 23:03:53 mestre Exp $
 
 COMMENT=		simple X terminal
 
 DISTNAME=		st-0.7
-REVISION=		0
+REVISION=		1
 
 CATEGORIES=		x11
 

x11/st/patches/patch-st_c

@@ -1,6 +1,7 @@
-$OpenBSD: patch-st_c,v 1.3 2017/04/05 21:29:57 juanfra Exp $
---- st.c.orig	Thu Aug 11 16:25:58 2016
-+++ st.c	Wed Mar 29 14:20:44 2017
+$OpenBSD: patch-st_c,v 1.4 2017/09/26 23:03:53 mestre Exp $
+Index: st.c
+--- st.c.orig
++++ st.c
 @@ -1454,9 +1454,15 @@ ttynew(void)
  			die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
  		close(s);
@@ -12,7 +13,7 @@ $OpenBSD: patch-st_c,v 1.3 2017/04/05 21:29:57 juanfra Exp $
  		execsh();
  		break;
  	default:
-+		if (pledge("stdio rpath tty", NULL) == -1)
++		if (pledge("stdio rpath tty proc", NULL) == -1)
 +			die("pledge\n");
  		close(s);
  		cmdfd = m;