diff --git a/Build.sh b/Build.sh
index aec73e5..c221c22 100644
--- a/Build.sh
+++ b/Build.sh
@@ -1,5 +1,5 @@
 #!/bin/sh
-# $MirOS: src/bin/mksh/Build.sh,v 1.24 2006/01/27 00:50:12 tg Exp $
+# $MirOS: src/bin/mksh/Build.sh,v 1.25 2006/03/19 18:06:31 tg Exp $
 #-
 # This script recognises CC, CFLAGS, CPPFLAGS, LDFLAGS, LIBS and NROFF.
 
@@ -51,13 +51,18 @@ case "`uname -s 2>/dev/null || uname`" in
 Darwin)
 	LDSTATIC= # never works
 	;;
+Interix)
+	CPPFLAGS="$CPPFLAGS -D_ALL_SOURCE"
+	;;
 Linux)
 	# Hello Mr Drepper, we all like you too...</sarcasm>
 	SRCS="$SRCS compat.c strlfun.c"
+	CPPFLAGS="$CPPFLAGS -D_POSIX_SOURCE"
 	LDSTATIC= # glibc dlopens the PAM library with getpwnam at runtime
 	;;
 SunOS)
 	SRCS="$SRCS compat.c"
+	CPPFLAGS="$CPPFLAGS -D_BSD_SOURCE"
 	CFLAGS="$CFLAGS -Wno-char-subscripts"
 	LDSTATIC= # alternatively you need libdl... same suckage as above
 	;;
diff --git a/sh.h b/sh.h
index 2e49314..28a385e 100644
--- a/sh.h
+++ b/sh.h
@@ -8,18 +8,10 @@
 /*	$OpenBSD: c_test.h,v 1.4 2004/12/20 11:34:26 otto Exp $	*/
 /*	$OpenBSD: tty.h,v 1.5 2004/12/20 11:34:26 otto Exp $	*/
 
-#define	MKSH_SH_H_ID	"$MirOS: src/bin/mksh/sh.h,v 1.24 2006/01/29 20:04:53 tg Exp $"
-
-#if defined(__INTERIX) && !defined(_ALL_SOURCE)
-#define _ALL_SOURCE
-#endif
+#define	MKSH_SH_H_ID	"$MirOS: src/bin/mksh/sh.h,v 1.25 2006/03/19 18:06:32 tg Exp $"
 
 #include <sys/param.h>
 
-#if defined(__gnu_linux__) && !defined(_POSIX_SOURCE)
-#define _POSIX_SOURCE
-#endif
-
 #ifndef __RCSID
 #define	__RCSID(x)	static const char __rcsid[] __attribute__((used)) = (x)
 #endif