On cygwin, compilation failed because SIOCSIFHWADDR is undefined. * src/util/virnetdev.c (virNetDevSetMAC): Cygwin can query but not set mac address. Signed-off-by: Eric Blake <eblake(a)redhat.com&gt; --- Pushing under the build-breaker rule. I may have a few more cygwin-related patches as I continue to try and build there, but figured it's better to send things as individual patches instead of squashing unrelated fixes in one go. src/util/virnetdev.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c index 0a3e17d..8013f23 100644 --- a/src/util/virnetdev.c +++ b/src/util/virnetdev.c @@ -132,7 +132,8 @@ int virNetDevExists(const char *ifname) #endif -#if defined(SIOCGIFHWADDR) && defined(HAVE_STRUCT_IFREQ) +#if defined(SIOCGIFHWADDR) && defined(SIOCSIFHWADDR) && \ + defined(HAVE_STRUCT_IFREQ) /** * virNetDevSetMAC: * @ifname: interface name to set MTU for -- 1.8.1.4