Diff to make OpenBSD's pdksh work on OSX.

ksh_osx.diff

diff --git a/Makefile b/Makefile
index c3a880c..c07ae39 100644
--- a/Makefile
+++ b/Makefile
@@ -17,6 +17,9 @@ OBJS+=  	openbsd/strlcat.o openbsd/strlcpy.o openbsd/setmode.o \
 DEFS=		-Wall -D_GNU_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 \
 		-DSYSTYPE=\"${OSTYPE}\"
 CFLAGS+=	${DEFS} -I. -I${.CURDIR}
+.if ${OSTYPE} == "Darwin"
+LDFLAGS+=	-arch x86_64
+.endif
 MAN=		ksh.1 sh.1
 NOGCCERROR=	1
 
diff --git a/main.c b/main.c
index 3bd46bd..f2ef692 100644
--- a/main.c
+++ b/main.c
@@ -10,6 +10,10 @@
 #include <sys/stat.h>
 #include <pwd.h>
 
+#ifdef __APPLE__
+#include <sys/param.h>
+#endif
+
 extern char **environ;
 
 /*
@@ -65,6 +69,8 @@ static const char *initcoms [] = {
 
 #ifdef __FreeBSD__
 	char username[_SC_LOGIN_NAME_MAX + 1];
+#elif defined __APPLE__
+	char username[MAXLOGNAME +1];
 #else
 	char username[LOGIN_NAME_MAX + 1];
 #endif
diff --git a/misc.c b/misc.c
index e41bef5..217130e 100644
--- a/misc.c
+++ b/misc.c
@@ -296,9 +296,9 @@ change_flag(enum sh_flag f,
 	if (f == FPRIVILEGED && oldval && !newval) {
 		gid_t gid = getgid();
 
-		setresgid(gid, gid, gid);
+		setgid(gid);
 		setgroups(1, &gid);
-		setresuid(ksheuid, ksheuid, ksheuid);
+		setuid(ksheuid);
 	} else if (f == FPOSIX && newval) {
 #ifdef BRACE_EXPAND
 		Flag(FBRACEEXPAND) = 0