Raspberry Pi - nearly builds, builds a lot, then fails with /usr/bin/ld: ./.libs/libevent.so: undefined reference to arc4random_addrandom'` 🙄

[enjoysmath]

checking for pid_t... yes
checking for size_t... yes
checking for ssize_t... yes
checking for uint64_t... yes
checking for uint32_t... yes
checking for uint16_t... yes
checking for uint8_t... yes
checking for uintptr_t... yes
checking for fd_mask... yes
checking size of long long... 8
checking size of long... 8
checking size of int... 4
checking size of short... 2
checking size of size_t... 8
checking size of void *... 8
checking size of off_t... 8
checking for struct in6_addr... yes
checking for struct sockaddr_in6... yes
checking for sa_family_t... yes
checking for struct addrinfo... yes
checking for struct sockaddr_storage... yes
checking for struct in6_addr.s6_addr32... yes
checking for struct in6_addr.s6_addr16... yes
checking for struct sockaddr_in.sin_len... no
checking for struct sockaddr_in6.sin6_len... no
checking for struct sockaddr_storage.ss_family... yes
checking for struct sockaddr_storage.__ss_family... no
checking for struct so_linger... no
checking for socklen_t... yes
checking whether our compiler supports __func__... yes
checking for the pthreads library -lpthreads... no
checking whether pthreads work without any flags... yes
checking for joinable pthread attribute... PTHREAD_CREATE_JOINABLE
checking if more special flags are required for pthreads... no
checking size of pthread_t... 8
checking for library containing ERR_remove_thread_state... -lcrypto
checking that generated files are newer than configure... done
configure: creating ./config.status
config.status: creating libevent.pc
config.status: creating libevent_openssl.pc
config.status: creating libevent_pthreads.pc
config.status: creating libevent_core.pc
config.status: creating libevent_extra.pc
config.status: creating Makefile
config.status: creating config.h
config.status: creating evconfig-private.h
config.status: executing depfiles commands
config.status: executing libtool commands
[  9%] Performing build step for 'libevent'
  GEN      test/rpcgen-attempted
  File "/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/test/../event_rpcgen.py", line 39
    print s
    ^^^^^^^
SyntaxError: Missing parentheses in call to 'print'. Did you mean print(...)?
event_rpcgen.py failed, /home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/test/regress.gen.\[ch\] will be reused.
  GEN      include/event2/event-config.h
  CC       buffer.lo
  CC       bufferevent.lo
  CC       bufferevent_filter.lo
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/bufferevent_filter.c: In function ‘be_filter_ctrl’:
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/bufferevent_filter.c:610:20: warning: this statement may fall through [-Wimplicit-fallthrough=]
  610 |                 if (bevf->underlying &&
      |                    ^
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/bufferevent_filter.c:616:9: note: here
  616 |         case BEV_CTRL_GET_FD:
      |         ^~~~
  CC       bufferevent_pair.lo
  CC       bufferevent_ratelim.lo
  CC       bufferevent_sock.lo
  CC       event.lo
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/event.c: In function ‘event_signal_closure’:
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/event.c:1319:32: warning: storing the address of local variable ‘ncalls’ in ‘*ev.ev_.ev_signal.ev_pncalls’ [-Wdangling-pointer=]
 1319 |                 ev->ev_pncalls = &ncalls;
      |                 ~~~~~~~~~~~~~~~^~~~~~~~~
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/event.c:1313:15: note: ‘ncalls’ declared here
 1313 |         short ncalls;
      |               ^~~~~~
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/event.c:1313:15: note: ‘ev’ declared here
  CC       evmap.lo
  CC       evthread.lo
  CC       evutil.lo
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/evutil.c:208:21: warning: argument 4 of type ‘int[2]’ with mismatched bound [-Warray-parameter=]
  208 |     evutil_socket_t fd[2])
In file included from /home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/evutil.c:80:
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/include/event2/util.h:312:25: note: previously declared as ‘int[]’
  312 | #define evutil_socket_t int
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/util-internal.h:268:47: note: in expansion of macro ‘evutil_socket_t’
  268 | int evutil_ersatz_socketpair_(int, int , int, evutil_socket_t[]);
      |                                               ^~~~~~~~~~~~~~~
  CC       evutil_rand.lo
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/evutil_rand.c: In function ‘evutil_secure_rng_add_bytes’:
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/evutil_rand.c:198:9: warning: implicit declaration of function ‘arc4random_addrandom’ [-Wimplicit-function-declaration]
  198 |         arc4random_addrandom((unsigned char*)buf,
      |         ^~~~~~~~~~~~~~~~~~~~
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/evutil_rand.c:198:9: warning: nested extern declaration of ‘arc4random_addrandom’ [-Wnested-externs]
  CC       evutil_time.lo
  CC       listener.lo
  CC       log.lo
  CC       strlcpy.lo
  CC       select.lo
  CC       poll.lo
  CC       epoll.lo
  CC       signal.lo
  CC       evdns.lo
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/evdns.c: In function ‘evdns_request_transmit’:
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/evdns.c:2269:25: warning: this statement may fall through [-Wimplicit-fallthrough=]
 2269 |                 retcode = 1;
      |                 ~~~~~~~~^~~
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/evdns.c:2272:9: note: here
 2272 |         default:
      |         ^~~~~~~
  CC       event_tagging.lo
  CC       evrpc.lo
  CC       http.lo
  CCLD     libevent.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CCLD     libevent_core.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CCLD     libevent_extra.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CC       evthread_pthread.lo
  CCLD     libevent_pthreads.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CC       libevent_openssl_la-bufferevent_openssl.lo
  CCLD     libevent_openssl.la
ar: `u' modifier ignored since `D' is the default (see `U')
  CC       sample/dns-example.o
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/sample/dns-example.c: In function ‘main’:
/home/dshuser/uscxml/build/raspberry/deps/libevent/src/libevent/sample/dns-example.c:169:48: warning: comparison is always true due to limited range of data type [-Wtype-limits]
  169 |         while ((opt = getopt(c, v, "xvc:Ts:")) != -1) {
      |                                                ^~
  CCLD     sample/dns-example
/usr/bin/ld: ./.libs/libevent.so: undefined reference to `arc4random_addrandom'
collect2: error: ld returned 1 exit status
make[4]: *** [Makefile:1400: sample/dns-example] Error 1
make[3]: *** [Makefile:1248: all] Error 2
make[2]: *** [CMakeFiles/libevent.dir/build.make:86: deps/libevent/src/libevent-stamp/libevent-build] Error 2
make[1]: *** [CMakeFiles/Makefile2:283: CMakeFiles/libevent.dir/all] Error 2
make: *** [Makefile:166: all] Error 2
dshuser@raspberrypi:~/uscxml/build/raspberry$

I need this tool urgently for a paid Raspberry Pi 4 controlled house solar heating system. The system is simply too complicated to code / manage without such a tool. How can I fix this error? Thank you! 😎

[enjoysmath]

Looks like someone is using Python 2 print statements EVERYWHERE!!!! 🥇