distinguish between Minix 3 and Ninix 3

Build.sh

@@ -1,5 +1,5 @@
 #!/bin/sh
-srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.511 2012/03/03 19:27:07 tg Exp $'
+srcversion='$MirOS: src/bin/mksh/Build.sh,v 1.512 2012/03/03 21:30:13 tg Exp $'
 #-
 # Copyright (c) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
 #		2011, 2012
@@ -293,7 +293,7 @@ if test -d mksh || test -d mksh.exe; then
 	echo "$me: Error: ./mksh is a directory!" >&2
 	exit 1
 fi
-rmf a.exe* a.out* conftest.c *core lft mksh* no *.bc *.ll *.o \
+rmf a.exe* a.out* conftest.c *core core.* lft mksh* no *.bc *.ll *.o \
     Rebuild.sh signames.inc test.sh x vv.out
 
 curdir=`pwd` srcdir=`dirname "$0"` check_categories=
@@ -395,6 +395,47 @@ if test x"$TARGET_OS" = x"Android"; then
 	TARGET_OS=Linux
 fi
 
+# Evil OS
+if test x"$TARGET_OS" = x"Minix"; then
+	echo >&2 "
+WARNING: additional checks before running Build.sh required!
+You can avoid these by calling Build.sh correctly, see below.
+"
+	cat >conftest.c <<'EOF'
+#include <sys/types.h>
+#ifdef _NETBSD_SOURCE
+ct=Ninix3
+#else
+ct=Minix3
+#endif
+EOF
+	ct=unknown
+	vv ']' "${CC-cc} -E $CFLAGS $CPPFLAGS $NOWARN conftest.c | grep ct= | tr -d \\\\015 >x"
+	sed 's/^/[ /' x
+	eval `cat x`
+	rmf x vv.out
+	case $ct in
+	Minix3|Ninix3)
+		echo >&2 "
+Warning: you set TARGET_OS to $TARGET_OS but that is ambiguous.
+Please set it to either Minix3 or Ninix3, whereas the latter is
+all versions of Minix with even partial NetBSD(R) userland. The
+value determined from your compiler for the current compilation
+(which may be wrong) is: $ct
+"
+		TARGET_OS=$ct
+		;;
+	*)
+		echo >&2 "
+Warning: you set TARGET_OS to $TARGET_OS but that is ambiguous.
+Please set it to either Minix3 or Ninix3, whereas the latter is
+all versions of Minix with even partial NetBSD(R) userland. The
+proper value couldn't be determined, continue at your own risk.
+"
+		;;
+	esac
+fi
+
 # Configuration depending on OS revision, on OSes that need them
 case $TARGET_OS in
 QNX)
@@ -467,7 +508,7 @@ Linux)
 	;;
 MidnightBSD)
 	;;
-Minix)
+Minix3)
 	add_cppflags -DMKSH_UNEMPLOYED
 	add_cppflags -DMKSH_CONSERVATIVE_FDS
 	add_cppflags -DMKSH_NO_LIMITS
@@ -486,6 +527,14 @@ MSYS_*)
 	;;
 NetBSD)
 	;;
+Ninix3)
+	# similar to Minix3
+	add_cppflags -DMKSH_UNEMPLOYED
+	add_cppflags -DMKSH_CONSERVATIVE_FDS
+	add_cppflags -DMKSH_NO_LIMITS
+	# but no idea what else could be needed
+	oswarn="; it has unknown issues"
+	;;
 OpenBSD)
 	: ${HAVE_SETLOCALE_CTYPE=0}
 	;;
@@ -1248,7 +1297,7 @@ else
 		#define EXTERN
 		#define MKSH_INCLUDES_ONLY
 		#include "sh.h"
-		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.511 2012/03/03 19:27:07 tg Exp $");
+		__RCSID("$MirOS: src/bin/mksh/Build.sh,v 1.512 2012/03/03 21:30:13 tg Exp $");
 		int main(void) { printf("Hello, World!\n"); return (0); }
 EOF
 	case $cm in