# C++ Get Started Consumer/Producer Tutorial Does Not Work **URL:** \ **Category:** Site Feedback\ **Created:** [24 August 2022 01:12 UTC](https://forum.confluent.io/t/c-get-started-consumer-producer-tutorial-does-not-work/5860 "2022-08-24T01:12:42Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![adammpolak](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.confluent.io/adammpolak/32/2151_2.png) [@adammpolak](https://forum.confluent.io/u/adammpolak)\ **Post date:** [24 August 2022 01:12 UTC](https://forum.confluent.io/t/c-get-started-consumer-producer-tutorial-does-not-work/5860/1 "2022-08-24T01:12:42Z")
System Ubuntu 20.04 At the “Build Producer” step > **[Apache Kafka and C/C++ - Getting Started Tutorial](https://developer.confluent.io/get-started/c/#build-producer)** > > How to develop your first Kafka client application in C/C++, which produces and consumes messages from a Kafka cluster, complete with configuration instructions. When running `make producer` this error occurs ```auto producer.c:67:37: warning: implicit declaration of function ‘arc4random’; did you mean ‘srandom’? [-Wimplicit-function-declaration] 67 | const char *key = user_ids[arc4random() % ARR_SIZE(user_ids)]; | ^ ~~~~~~~~~ | srandom ``` The steps were followed exactly, this tutorial does not work. ---
**Author:** ![adammpolak](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.confluent.io/adammpolak/32/2151_2.png) [@adammpolak](https://forum.confluent.io/u/adammpolak)\ **Post date:** [26 August 2022 15:51 UTC](https://forum.confluent.io/t/c-get-started-consumer-producer-tutorial-does-not-work/5860/2 "2022-08-26T15:51:06Z")
Also, when I changed the use of arc4random() to random() I then get a new error that seems to have to do with linking libraries It is like the Makefile is not correct? ```auto $ make producer cc -Wall -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -lrdkafka -lglib-2.0 producer.c -o producer /usr/bin/ld: /tmp/cczmdeDb.o: in function `g_autoptr_cleanup_generic_gfree': producer.c:(.text+0x1f): undefined reference to `g_free' /usr/bin/ld: /tmp/cczmdeDb.o: in function `glib_autoptr_clear_GError': producer.c:(.text+0x41): undefined reference to `g_error_free' /usr/bin/ld: /tmp/cczmdeDb.o: in function `glib_autoptr_clear_GKeyFile': producer.c:(.text+0x81): undefined reference to `g_key_file_unref' /usr/bin/ld: /tmp/cczmdeDb.o: in function `load_config_group': producer.c:(.text+0x105): undefined reference to `g_key_file_get_keys' /usr/bin/ld: producer.c:(.text+0x145): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x17c): undefined reference to `g_key_file_get_string' /usr/bin/ld: producer.c:(.text+0x1b8): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x1e4): undefined reference to `rd_kafka_conf_set' /usr/bin/ld: producer.c:(.text+0x20d): undefined reference to `g_log' /usr/bin/ld: /tmp/cczmdeDb.o: in function `dr_msg_cb': producer.c:(.text+0x28e): undefined reference to `rd_kafka_err2str' /usr/bin/ld: producer.c:(.text+0x2ac): undefined reference to `g_log' /usr/bin/ld: /tmp/cczmdeDb.o: in function `main': producer.c:(.text+0x30e): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x332): undefined reference to `g_key_file_new' /usr/bin/ld: producer.c:(.text+0x35e): undefined reference to `g_key_file_load_from_file' /usr/bin/ld: producer.c:(.text+0x38b): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x392): undefined reference to `rd_kafka_conf_new' /usr/bin/ld: producer.c:(.text+0x3cf): undefined reference to `rd_kafka_conf_set_dr_msg_cb' /usr/bin/ld: producer.c:(.text+0x3ef): undefined reference to `rd_kafka_new' /usr/bin/ld: producer.c:(.text+0x425): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x5f5): undefined reference to `rd_kafka_producev' /usr/bin/ld: producer.c:(.text+0x615): undefined reference to `rd_kafka_err2str' /usr/bin/ld: producer.c:(.text+0x640): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x67b): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x68f): undefined reference to `rd_kafka_poll' /usr/bin/ld: producer.c:(.text+0x6c3): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x6d7): undefined reference to `rd_kafka_flush' /usr/bin/ld: producer.c:(.text+0x6e6): undefined reference to `rd_kafka_outq_len' /usr/bin/ld: producer.c:(.text+0x6f9): undefined reference to `rd_kafka_outq_len' /usr/bin/ld: producer.c:(.text+0x716): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x745): undefined reference to `g_log' /usr/bin/ld: producer.c:(.text+0x754): undefined reference to `rd_kafka_destroy' collect2: error: ld returned 1 exit status make: *** [: producer] Error 1 ``` ---
**Author:** ![dtroiano](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.confluent.io/dtroiano/32/1961_2.png) [@dtroiano](https://forum.confluent.io/u/dtroiano)\ **Post date:** [31 August 2022 13:51 UTC](https://forum.confluent.io/t/c-get-started-consumer-producer-tutorial-does-not-work/5860/3 "2022-08-31T13:51:13Z")
Thank you for reporting this. I was able to repro both issues (`arc4random`, and linkage errors). For the `arc4random` one, I like changing to `random` since `arc4random` looks to be BSD only. This is better than having to install a BSD compat package. For the linker errors, yeah I think that the tutorial should have explicit `CFLAGS` and `LDLIBS`, and that `glib-2.0` should come first. Could you try the Makefile below and report back if it goes smoothly? I’ll update the tutorial if you can confirm. ```auto ALL: producer consumer CFLAGS=-Wall $(shell pkg-config --cflags glib-2.0 rdkafka) LDLIBS=$(shell pkg-config --libs glib-2.0 rdkafka) ``` ---
**Author:** ![adammpolak](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.confluent.io/adammpolak/32/2151_2.png) [@adammpolak](https://forum.confluent.io/u/adammpolak)\ **Post date:** [31 August 2022 15:20 UTC](https://forum.confluent.io/t/c-get-started-consumer-producer-tutorial-does-not-work/5860/4 "2022-08-31T15:20:13Z")
That fixed it thank you. I am now able to complete the tutorial. ---
**Author:** ![system](https://us1.discourse-cdn.com/flex019/uploads/confluentcommunity/original/1X/c49438c90c9df282e9996fdf6971be890c71b65a.svg) [@system](https://forum.confluent.io/u/system)\ **Post date:** [7 September 2022 15:20 UTC](https://forum.confluent.io/t/c-get-started-consumer-producer-tutorial-does-not-work/5860/5 "2022-09-07T15:20:55Z")
Closed on 7 September 2022 15:20 UTC This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.