diff -ru ksh-openbsd-20180115.orig/history.c ksh-openbsd-20180115/history.c

--- ksh-openbsd-20180115.orig/history.c	2018-01-15 23:04:15.000000000 +0100

+++ ksh-openbsd-20180115/history.c	2018-04-14 15:31:50.346308024 +0200

@@ -28,6 +28,10 @@

 #include "vis.h"

 #include "sh.h"

+#ifndef F_EXLCK

+#define F_EXLCK 4

+#endif

+

 #define timespeccmp(tsp, usp, cmp)		\

 	(((tsp)->tv_sec == (usp)->tv_sec) ?	\

 		((tsp)->tv_nsec cmp (usp)->tv_nsec) :	\

diff -ru ksh-openbsd-20180115.orig/Makefile ksh-openbsd-20180115/Makefile

--- ksh-openbsd-20180115.orig/Makefile	2018-01-15 23:04:15.000000000 +0100

+++ ksh-openbsd-20180115/Makefile	2018-04-14 16:03:43.040414391 +0200

@@ -22,12 +22,12 @@

 CDIAGFLAGS+=	-Wshadow

 CDIAGFLAGS+=	-Wdeclaration-after-statement

-CFLAGS +=	$(CDIAGFLAGS) `getconf LFS_CFLAGS` -DEMACS -DVI

+CFLAGS +=	$(CDIAGFLAGS) `getconf LFS_CFLAGS` -D_GNU_SOURCE -DEMACS -DVI

 LDADD +=	-lbsd

 $(PROG): $(OBJS)

-	$(CC) -o $(PROG) $(CFLAGS) $(LDADD) \

-		$(OBJS)

+	$(CC) -o $(PROG) $(CFLAGS) \

+		$(OBJS) $(LDADD)

 all: $(PROG)

@@ -37,7 +37,7 @@

 install:

 	install -m755 -d $(BINDIR)

-	install -m755 --strip --no-target-directory ksh $(BINDIR)/pdksh

+	install -m755 --no-target-directory ksh $(BINDIR)/pdksh

 	install -m755 -d $(MANDIR)/man1

 	install -m644 --no-target-directory ksh.1 $(MANDIR)/man1/pdksh.1

 	install -m644 --no-target-directory sh.1 $(MANDIR)/man1/pdksh-sh.1

diff -ru ksh-openbsd-20180115.orig/vis.c ksh-openbsd-20180115/vis.c

--- ksh-openbsd-20180115.orig/vis.c	2018-01-15 23:04:15.000000000 +0100

+++ ksh-openbsd-20180115/vis.c	2018-04-14 15:38:41.605684906 +0200

@@ -139,7 +139,7 @@

 	*dst = '\0';

 	return (dst);

 }

-DEF_WEAK(vis);

+//DEF_WEAK(vis);

 /*

  * strvis, strnvis, strvisx - visually encode characters from src into dst

@@ -165,7 +165,7 @@

 	*dst = '\0';

 	return (dst - start);

 }

-DEF_WEAK(strvis);

+//DEF_WEAK(strvis);

 int

 strnvis(char *dst, const char *src, size_t siz, int flag)