IPPROTO_IP is not a macro
Sam Steingold
sds@gnu.org
Thu May 19 19:12:00 GMT 2005
<http://www.opengroup.org/onlinepubs/009695399/basedefs/netinet/in.h.html>:
The <netinet/in.h> header shall define the following macros for use as
values of the level argument of getsockopt() and setsockopt():
IPPROTO_IP
Internet protocol.
etc
cygwin defines these constants with enum, not #define, so one cannot use
#ifdef with them.
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