If _XOPEN_SOURCE_EXTENDED or _XOPEN_SOURCE are defined, _POSIX_C_SOURCE gets

defined in DECC$TYPES.H.  If _POSIX_C_SOURCE is defined, certain types do
not get defined (u_char, u_int, ...).  DECC.H gets included by assert.h
and others.  Now, in6.h uses the types u_char, u_int and so on, and gets
included as part of other header inclusions, and will of course fail because
of the missing types.

On the other hand, _XOPEN_SOURCE_EXTENDED is needed to get gethostname()
properly declared...

Solution: define _XOPEN_SOURCE_EXTENDED much later, so DECC$TYPES.H has
a chance to be included *first*, so the otherwise missing types get defined
properly.

Personal: *mumble* *mumble*

ssl/ssltest.c

@@ -116,9 +116,6 @@
 
 #define _BSD_SOURCE 1		/* Or gethostname won't be declared properly
 				   on Linux and GNU platforms. */
-#define _XOPEN_SOURCE_EXTENDED	1 /* Or gethostname won't be declared properly
-				   on Compaq platforms (at least with DEC C).
-				*/
 
 #include <assert.h>
 #include <errno.h>
@@ -139,6 +136,13 @@
 #include <openssl/engine.h>
 #include <openssl/err.h>
 #include <openssl/rand.h>
+
+#define _XOPEN_SOURCE_EXTENDED	1 /* Or gethostname won't be declared properly
+				     on Compaq platforms (at least with DEC C).
+				     Do not try to put it earlier, or IPv6 includes
+				     get screwed...
+				  */
+
 #ifdef OPENSSL_SYS_WINDOWS
 #include <winsock.h>
 #include "../crypto/bio/bss_file.c"