Add missing HAVE_IN6 && AF_INET6 ifdef

This prevents building for operating systems that do not yet have IPv6
compatible socket API.  Error can be reproduced by (cross)building for
a os that doesn't have these headers.  This will abort with a error
about incomplete type 'struct in6_addr'.  All other uses of IPv6 API
in inet_drv.c are conditionalized like in the patch.

1 files changed, 2 insertions, 0 deletions

diff --git a/erts/emulator/drivers/common/inet_drv.c b/erts/emulator/drivers/common/inet_drv.c
index 47a99fdbe6..33523d8e57 100644
--- a/erts/emulator/drivers/common/inet_drv.c
+++ b/erts/emulator/drivers/common/inet_drv.c
@@ -4089,6 +4089,7 @@ static char* buf_to_sockaddr(char* ptr, char* end, struct sockaddr* addr)
 	addr->sa_family = AF_INET;
 	return ptr + sizeof(struct in_addr);
     }
+#if defined(HAVE_IN6) && defined(AF_INET6)
     case INET_AF_INET6: {
 	struct in6_addr *p = &((struct sockaddr_in6*)addr)->sin6_addr;
 	buf_check(ptr,end,sizeof(struct in6_addr));
@@ -4096,6 +4097,7 @@ static char* buf_to_sockaddr(char* ptr, char* end, struct sockaddr* addr)
 	addr->sa_family = AF_INET6;
 	return ptr + sizeof(struct in6_addr);
     }
+#endif
     }
  error:
     return NULL;