Index: shells/44bsd-csh/Makefile
===================================================================
--- shells/44bsd-csh/Makefile
+++ shells/44bsd-csh/Makefile
@@ -1,15 +1,12 @@
 PORTNAME=	44bsd-csh
 PORTVERSION=	20001106
-PORTREVISION=	5
+PORTREVISION=	6
 CATEGORIES=	shells
 MASTER_SITES=	LOCAL/cy
 
 MAINTAINER=	cy@FreeBSD.org
 COMMENT=	The traditional 4.4BSD /bin/csh C-shell
 
-BROKEN_aarch64=	Fails to link: missing sbrk
-BROKEN_riscv64=	Fails to link: missing sbrk
-
 EXTRACT_DEPENDS=	rcs:devel/rcs57
 
 USES=		tar:bzip2
Index: shells/44bsd-csh/files/patch-alloc.c
===================================================================
--- /dev/null
+++ shells/44bsd-csh/files/patch-alloc.c
@@ -0,0 +1,48 @@
+--- alloc.c.orig
++++ alloc.c
+@@ -52,17 +52,12 @@
+ #include "csh.h"
+ #include "extern.h"
+ 
+-char   *memtop = NULL;		/* PWP: top of current memory */
+-char   *membot = NULL;		/* PWP: bottom of allocatable memory */
+-
+ ptr_t
+ Malloc(n)
+     size_t  n;
+ {
+     ptr_t   ptr;
+ 
+-    if (membot == NULL)
+-	memtop = membot = sbrk(0);
+     if ((ptr = malloc(n)) == (ptr_t) 0) {
+ 	child++;
+ 	stderror(ERR_NOMEM);
+@@ -77,8 +72,6 @@
+ {
+     ptr_t   ptr;
+ 
+-    if (membot == NULL)
+-	memtop = membot = sbrk(0);
+     if ((ptr = realloc(p, n)) == (ptr_t) 0) {
+ 	child++;
+ 	stderror(ERR_NOMEM);
+@@ -92,8 +85,6 @@
+ {
+     ptr_t   ptr;
+ 
+-    if (membot == NULL)
+-	memtop = membot = sbrk(0);
+     if ((ptr = calloc(s, n)) == (ptr_t) 0) {
+ 	child++;
+ 	stderror(ERR_NOMEM);
+@@ -123,8 +114,5 @@
+     Char **v;
+     struct command *t;
+ {
+-    memtop = (char *) sbrk(0);
+-    (void) fprintf(cshout, "Allocated memory from 0x%lx to 0x%lx (%ld).\n",
+-	    (unsigned long) membot, (unsigned long) memtop,
+-                (unsigned long) (memtop - membot));
++    (void) fprintf(cshout, "memory stats not supported\n");
+ }