portability fixes

configure.ac

@@ -80,7 +80,7 @@ AH_BOTTOM([
 ])
 
 dnl Checks for header files.
-AC_CHECK_HEADERS(unistd.h sys/file.h stdlib.h sys/select.h)
+AC_CHECK_HEADERS(unistd.h sys/file.h stdlib.h sys/select.h getopt.h)
 
 AC_CONFIG_FILES([Makefile
                  doc/Makefile

src/fping.c

@@ -1593,6 +1593,7 @@ int receive_reply(int socket,
         }
 
 #if HAVE_SO_TIMESTAMP
+        {
             /* ancilliary data */
             struct cmsghdr* cmsg;
             for (cmsg = CMSG_FIRSTHDR(&recv_msghdr);
@@ -1603,6 +1604,7 @@ int receive_reply(int socket,
                     timestamp_set = 1;
                 }
             }
+        }
 #endif
 
         if (!timestamp_set) {