AT&T AST (att/ast) on github has rewound their repo back to ksh93u+. See

att/ast#1464 and
att/ast#1466.

The reason for the rewind back to 93u+ instead of 93v- was that it was an
abandoned unstable buggy unfinished beta. A full explanation of this can be
found here, att/ast#1466 (comment).

The version number is reverted back to 93u and an EPOCH bump, though not
needed, documents this siesmic shift.

shells/ksh93/Makefile

@@ -1,17 +1,34 @@
 # $FreeBSD$
 
+# Make sure that your configuration DOES NOT set ANY gcc-related
+# variables.  ksh93 will not compile if you set even the seemingly
+# most unrelated variable related to gcc configuration.  This means
+# especially any flag which attempts to set the cputype.  Setting the
+# cputype does absolutely nothing except cause systems to fail in
+# horrible ways.  For any modern processor, setting the cputype only
+# serves to expose gcc bugs and does nothing to speed up any known
+# program.  If you are really unconvinced, go ahead but do not
+# complain to me about it.
+
+# Do not update this port to 93v. 93v was an abandoned beta when
+# David Korn left the project. It was subsequently reverted to 93u.
+# https://github.com/att/ast/issues/1466#issuecomment-589942449
+
 PORTNAME=	ksh93
-DISTVERSION=	2020.0.1
+DISTVERSION=	93u
 PORTREVISION=	1
-PORTEPOCH=	1
+PORTEPOCH=	2
 CATEGORIES=	shells
+DIST_SUBDIR=	ksh93
 
 MAINTAINER=	cy@FreeBSD.org
 COMMENT=	AT&T KornShell 93
 
 LICENSE=	EPL
 
-USES=		compiler:c11 meson ninja python:build
+BROKEN_aarch64=	Fails to compile: needs sbrk
+
+USES=		compiler:c11
 
 USE_GITHUB=	yes
 GH_ACCOUNT=	att
@@ -20,15 +37,18 @@ GH_PROJECT=	ast
 KSH_CONFLICTS=		pdksh-*
 KSH93_CONFLICTS=	ksh93-devel-* ast-ksh-*
 
-MESON_BUILD_DIR=	build
-
-OPTIONS_DEFAULT=	KSH93
+OPTIONS_DEFAULT=	KSH93 EXAMPLES
+OPTIONS_DEFINE=		EXAMPLES STATIC
 OPTIONS_SINGLE=		BIN_KSH
 OPTIONS_SINGLE_BIN_KSH=	KSH KSH93
 KSH_DESC=		Install to ${PREFIX}/bin/ksh
 KSH93_DESC=		Install to ${PREFIX}/bin/ksh93
 
-KSH93_EXTRA_PATCHES=	${FILESDIR}/extra-patch-install-as-ksh93
+CFLAGS+=	-DMAP_TYPE
+LDFLAGS+=	-lm
+MAKE_ENV=	CCFLAGS="-Wno-unused-value -Wno-parentheses -Wno-logical-op-parentheses" CFLAGS="${CFLAGS}"
+
+STATIC_MAKE_ENV=     LDFLAGS+=-static
 
 KSH_PLIST_SUB=		93=""
 KSH93_PLIST_SUB=	93="93"
@@ -39,14 +59,25 @@ KSH93_PLIST_SUB=	93="93"
 BROKEN=	GCC 9.1 changes the output of `gcc -E` which breaks the conf.sh script, fixed in shells/ksh93-devel
 .endif
 
-post-patch:
-	@${REINPLACE_CMD} -e '/for name in/ s|python.*|${PYTHON_CMD}|g' ${WRKSRC}/scripts/python.sh
-	@${REINPLACE_CMD} -e 's|SF_FLAGS|SFIO_FLAGS|g' ${WRKSRC}/src/lib/libast/include/sfio*.h ${WRKSRC}/src/lib/libast/sfio/*.c
 .if ${PORT_OPTIONS:MKSH93}
-	@${MV} ${WRKSRC}/src/cmd/ksh93/docs/ksh.1 ${WRKSRC}/src/cmd/ksh93/docs/ksh93.1
-.endif
-.if ${PORT_OPTIONS:MKSH}
-	@# Keep portlint happy
+PNAME=		ksh93
+.else
+PNAME=		ksh
 .endif
 
+post-patch:
+	@${REINPLACE_CMD} -e 's|SF_FLAGS|SFIO_FLAGS|g' ${WRKSRC}/src/lib/libast/include/sfio*.h ${WRKSRC}/src/lib/libast/sfio/*.c
+
+do-build:
+	@cd ${WRKSRC}/ && ${SETENV} -i ${MAKE_ENV} ${SH} bin/package flat make ksh93
+
+do-install:
+	${INSTALL_PROGRAM} ${WRKSRC}/bin/ksh ${STAGEDIR}${PREFIX}/bin/${PNAME}
+	${INSTALL_MAN} ${WRKSRC}/man/man1/sh.1 ${STAGEDIR}${MAN1PREFIX}/man/man1/${PNAME}.1
+	${MKDIR} ${STAGEDIR}${EXAMPLESDIR}/
+	cd ${WRKSRC}/fun/ && ${INSTALL_SCRIPT} dirs popd pushd ${STAGEDIR}${EXAMPLESDIR}/
+
+do-test:
+	cd ${WRKSRC}/src/cmd/ksh93/tests/ && ${SETENV} SHELL=${WRKSRC}/bin/ksh ${WRKSRC}/bin/ksh shtests
+
 .include <bsd.port.post.mk>

shells/ksh93/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1578621862
-SHA256 (att-ast-2020.0.1_GH0.tar.gz) = dc022c80021bbe27aabcdcd90cc5caeabff1955cf5fdfcc32ebd410b0da141be
-SIZE (att-ast-2020.0.1_GH0.tar.gz) = 2023438
+TIMESTAMP = 1582352303
+SHA256 (ksh93/att-ast-93u_GH0.tar.gz) = 4cf10ae50306361a18d900008961093b5c2c51d69f4e50d14b911a8ce014d37f
+SIZE (ksh93/att-ast-93u_GH0.tar.gz) = 12960931

shells/ksh93/files/patch-src_cmd_std_features_procfs

@@ -0,0 +1,36 @@
+--- src/cmd/std/features/procfs.orig	2017-11-30 22:35:04 UTC
++++ src/cmd/std/features/procfs
+@@ -1,6 +1,6 @@
+ hdr	kvm,procinfo,pstat,asm/param
+
+-sys	procfs,sysctl
++sys	procfs,sysctl,user
+
+ lib	getprocs
+ lib	kvm_open,kvm_getprocs kvm.h sys/time.h sys/param.h sys/proc.h sys/sysctl.h -lkvm
+@@ -10,7 +10,11 @@ mem	extern_proc.p_pid,extern_proc.p_star
+ mem	procsinfo64.pi_pri procinfo.h
+ mem	prpsinfo.pr_clname,prpsinfo.pr_cstime,prpsinfo.pr_cstime.tv_sec,prpsinfo.pr_ctime,prpsinfo.pr_cutime,prpsinfo.pr_gid,prpsinfo.pr_lttydev,prpsinfo.pr_ntpid,prpsinfo.pr_pgid,prpsinfo.pr_pgrp,prpsinfo.pr_psargs,prpsinfo.pr_refcount,prpsinfo.pr_rssize,prpsinfo.pr_sid,prpsinfo.pr_sonproc,prpsinfo.pr_start,prpsinfo.pr_start.tv_sec,prpsinfo.pr_starttime,prpsinfo.pr_starttime.tv_sec,prpsinfo.pr_state,prpsinfo.pr_stime,prpsinfo.pr_tgrp,prpsinfo.pr_time,prpsinfo.pr_time.tv_sec,prpsinfo.pr_utime,prpsinfo.pr_zomb,prpsinfo.pr_pctcpu,prpsinfo.pr_cpu,prpsinfo.pr_lwp.pr_pctcpu,prpsinfo.pr_lwp.pr_cpu -D_STRUCTURED_PROC -Dprpsinfo=psinfo sys/types.h sys/procfs.h
+
++num	PIOCPSINFO
++
+ typ	struct.prpsinfo -D_STRUCTURED_PROC -Dprpsinfo=psinfo sys/types.h sys/procfs.h
++typ	struct.kinfo_proc sys/types.h sys/procfs.h sys/user.h
++typ	struct.kp_proc sys/types.h sys/procfs.h sys/user.h
+
+ tst	lib_info note{ info(2) kernel table api }end link{
+ 	#include <info.h>
+@@ -587,11 +591,11 @@ cat{
+ #define PSS_METHOD		PSS_METHOD_getprocs
+ #endif
+
+-#if !PSS_METHOD && defined(_PS_dir)
++#if !PSS_METHOD && defined(_PS_dir) && (_PS_scan_binary || _num_PIOCPSINFO)
+ #define PSS_METHOD		PSS_METHOD_procfs
+ #endif
+
+-#if !PSS_METHOD && _hdr_kvm && _sys_sysctl && _lib_kvm_open && _lib_kvm_getprocs
++#if !PSS_METHOD && _hdr_kvm && _sys_sysctl && _lib_kvm_open && _lib_kvm_getprocs && _typ_struct_kinfo_proc && _typ_struct_kp_proc
+ #define PSS_METHOD		PSS_METHOD_kvm
+ #endif
+

shells/ksh93/files/patch-src_cmd_std_pss-kvm.c

@@ -0,0 +1,12 @@
+--- src/cmd/std/pss-kvm.c.orig	2017-11-30 22:35:04 UTC
++++ src/cmd/std/pss-kvm.c
+@@ -43,6 +43,9 @@ NoN(pss_kvm)
+ #if _sys_proc
+ #include <sys/proc.h>
+ #endif
++#if _sys_user
++#include <sys/user.h>
++#endif
+ #include <sys/sysctl.h>
+ #include <sys/tty.h>
+

shells/ksh93/files/patch-src_lib_libast_features_mmap

@@ -0,0 +1,36 @@
+--- src/lib/libast/features/mmap.orig	2020-02-08 10:39:38.000000000 -0800
++++ src/lib/libast/features/mmap	2020-02-08 20:49:37.791733000 -0800
+@@ -16,14 +16,7 @@
+
+ 	#define Failed(file)	(remove(file),1)
+
+-	int
+-	#if _STD_
+-	main(int argc, char** argv)
+-	#else
+-	main(argc,argv)
+-	int     argc;
+-	char**  argv;
+-	#endif
++	int main(int argc, char** argv)
+ 	{
+ 		caddr_t		mm;
+ 		char		*t, *u, *f;
+@@ -326,17 +319,12 @@
+ cat{
+
+ 	/* some systems get it wrong but escape concise detection */
+-	#ifndef _NO_MMAP
+ 	#if __CYGWIN__
+ 	#define _NO_MMAP	1
+ 	#endif
+-	#endif
+
+ 	#if _NO_MMAP
+ 	#undef	_lib_mmap
+ 	#undef	_lib_mmap64
+-	#undef	_mmap_anon
+-	#undef	_mmap_devzero
+-	#undef	_mmap_worthy
+ 	#endif
+ }end

shells/ksh93/files/patch-src_lib_libast_features_standards

@@ -0,0 +1,23 @@
+--- src/lib/libast/features/standards.orig	2020-02-08 10:39:38.000000000 -0800
++++ src/lib/libast/features/standards	2020-02-08 21:58:23.687268000 -0800
+@@ -1,5 +1,19 @@
+ set stdio
+-if tst note{ _ALL_SOURCE & _POSIX_SOURCE & _POSIX_C_SOURCE & _XOPEN_SOURCE & __EXTENSIONS__ works }end compile{
++# In FreeBSD, definitions like _POSIX_SOURCE and such are used to *limit*
++# functionality to known API; they don't enable anything. The general intent in
++# BSD is to enable everything by default (effectively, providing the
++# _KITCHEN_SINK_SOURCE mentioned below). So we look for that here, but stay
++# careful that we don't get fooled by presence of FreeBSD that underpins some
++# subsystems in Mac OS X; there are other Apple-specific portability hacks
++# elsewhere we should not interfere with.
++if tst note{ FreeBSD }end compile{
++		#include <sys/param.h>
++		#if !defined(__FreeBSD__) || defined(APPLE)
++		#error not a FreeBSD system
++		#endif
++	}end {
++	}
++elif tst note{ _ALL_SOURCE & _POSIX_SOURCE & _POSIX_C_SOURCE & _XOPEN_SOURCE & __EXTENSIONS__ works }end compile{
+ 		#define _ALL_SOURCE	1
+ 		#define _POSIX_SOURCE	1
+ 		#define _POSIX_C_SOURCE	21000101L

shells/ksh93/files/patch-src_lib_libast_features_vmalloc

@@ -0,0 +1,10 @@
+--- src/lib/libast/features/vmalloc.orig	2016-02-28 17:09:23 UTC
++++ src/lib/libast/features/vmalloc
+@@ -217,7 +217,4 @@ cat{
+ 	#if _mmap_anon
+ 	#define _mem_mmap_anon	1
+ 	#endif
+-	#if _mmap_devzero
+-	#define _mem_mmap_zero	1
+-	#endif
+ }end

shells/ksh93/files/patch-src_lib_libast_features_wchar

@@ -0,0 +1,10 @@
+--- src/lib/libast/features/wchar.orig	2017-11-30 22:35:04 UTC
++++ src/lib/libast/features/wchar
+@@ -6,6 +6,7 @@ set	include .
+ cat{
+ 	#ifndef _AST_WCHAR_H
+ 	#define _AST_WCHAR_H	1
++	#define _STDFILE_DECLARED
+ }end
+
+ lib	mbstowcs,wctomb,wcscmp,wcscoll,wcslen,wcstombs,wcsxfrm,wcwidth stdlib.h stdio.h wchar.h

shells/ksh93/files/patch-src_lib_libast_port_astcopy.c

@@ -0,0 +1,17 @@
+--- src/lib/libast/port/astcopy.c.orig	2016-02-28 17:09:23 UTC
++++ src/lib/libast/port/astcopy.c
+@@ -30,14 +30,10 @@
+ #include <ast.h>
+ #include <ast_mmap.h>
+
+-#if _mmap_worthy > 1
+-
+ #include <ls.h>
+
+ #define MAPSIZE		(1024*256)
+
+-#endif
+-
+ #undef	BUFSIZ
+ #define BUFSIZ		4096
+

shells/ksh93/files/patch-src_lib_libast_sfio_sfhdr.h

@@ -0,0 +1,12 @@
+--- src/lib/libast/sfio/sfhdr.h.orig	2016-02-28 17:09:23 UTC
++++ src/lib/libast/sfio/sfhdr.h
+@@ -209,9 +209,6 @@
+
+ /* see if we can use memory mapping for io */
+ #if _LARGEFILE64_SOURCE && !_lib_mmap64
+-#undef _mmap_worthy
+-#endif
+-#if !_mmap_worthy
+ #undef _hdr_mman
+ #undef _sys_mman
+ #endif