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Subject2.3.39 doesn't build xconfig or menuconfig (libc5 / old_uid_t?)

When I attempt
make xconfig
I get the error
/usr/include/linux/types.h:35: parse error before `old_uid_t'

A simple one line program (uidt.c)
#include <signal.h>
also gets errors with respect to old_uid_t
/usr/include/asm/siginfo.h:27: parse error before `old_uid_t'

dd:dcd$ gcc -M uidt.c
uidt.o: uidt.c /usr/include/signal.h /usr/include/features.h \
/usr/include/sys/cdefs.h /usr/include/sys/types.h \
/usr/include/linux/types.h /usr/include/linux/posix_types.h \
/usr/include/asm/posix_types.h /usr/include/asm/types.h \
/usr/include/sys/bitypes.h /usr/include/linux/signal.h \
/usr/include/asm/signal.h /usr/include/asm/siginfo.h

My links are set up to point to the kernel sources
/usr/include/asm -> /usr/src/linux/include/asm-i386/
/usr/include/linux -> /usr/src/linux/include/linux/

If I modify /usr/include/asm/posix_types.h
to unconditionally 'export' the following 2 typedef lines (near line 32)

typedef unsigned short __kernel_old_uid_t;
typedef unsigned short __kernel_old_gid_t;

Here's a patch

--- linux/include/asm-i386/posix_types.h- Tue Jan 11 13:05:12 2000
+++ linux/include/asm-i386/posix_types.h Tue Jan 11 13:05:45 2000
@@ -31,9 +31,9 @@

#ifdef __KERNEL__
+#endif /* __KERNEL__ */
typedef unsigned short __kernel_old_uid_t;
typedef unsigned short __kernel_old_gid_t;
-#endif /* __KERNEL__ */

#ifdef __GNUC__
typedef long long __kernel_loff_t;

I'm not convinced that this is the 'right' thing to do, but at least
the kernel and user applications compile.

(Currently I've tweeked something, so I'm getting an oops in 2.3.39
when I go multi user but I'm not quite ready to submit that)

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