>>> When I try compile this "program":
[which begins with #include <sys/socket.h>]
>>> /usr/include/sys/socket.h:186: syntax error before `u_char'
>>> /usr/include/sys/socket.h:214: syntax error before `u_char'
>> You have to include <sys/types.h>

Surely the right thing to do is fix <sys/socket.h> so it includes
everything it needs?  I've been gradually fixing such include-file bugs
as I trip over them; of 99 .h file patches in my private patch tree, 37
are just to add such missing includes.  (Another 5 are to add
#ifndef/#define/#endif wrappers, and one does both.  The remaining 56
have other changes, though many of those 56 also add missing
#includes.)  I'm sure there are many left I haven't noticed; someday I
intend to do a sweep through /usr/include, compiling a file that
consists of a single #include for each of the files there.  (I expect
to end up ignoring a ot of files like <machine/proc.h> that exist for
internal reasons and which should never be included directly.)

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