cmake: Check for arpa/inet.h header file

Signed-off-by: Andreas Schneider <asn@cryptomilk.org>

ConfigureChecks.cmake

@@ -54,6 +54,7 @@ check_include_file(unistd.h HAVE_UNISTD_H)
 check_include_file(util.h HAVE_UTIL_H)
 check_include_file(libutil.h HAVE_LIBUTIL_H)
 check_include_file(sys/time.h HAVE_SYS_TIME_H)
+check_include_file(arpa/inet.h HAVE_ARPA_INET_H)
 
 if (WIN32)
   check_include_files("winsock2.h;ws2tcpip.h;wspiapi.h" HAVE_WSPIAPI_H)

src/packet_cb.c

@@ -24,7 +24,9 @@
 #include "config.h"
 
 #include <stdlib.h>
+#ifdef HAVE_ARPA_INET_H
 #include <arpa/inet.h>
+#endif
 
 #include "libssh/priv.h"
 #include "libssh/buffer.h"