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use #error when missing define

This makes it easier to figure out what's going wrong when
we forget to define _POSIX_SOURCE.

--- a/sys/include/ape/unistd.h

+++ b/sys/include/ape/unistd.h

@@ -1,7 +1,7 @@

 #ifndef	__UNISTD_H

 #define	__UNISTD_H

 #ifndef _POSIX_SOURCE

-   This header file is not defined in pure ANSI

+#error  This header file is not defined in pure ANSI

 #endif

 #pragma lib "/$M/lib/ape/libap.a"

-- 

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