# Libuavcan interfacing with chibios **URL:** \ **Category:** Development & Maintenance\ **Created:** [October 20, 2022, 10:13am UTC](https://forum.opencyphal.org/t/libuavcan-interfacing-with-chibios/1776 "2022-10-20T10:13:46Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Pramod](https://forum.opencyphal.org/letter_avatar_proxy/v4/letter/p/71c47a/32.png) [@Pramod](https://forum.opencyphal.org/u/Pramod)\ **Post date:** [October 20, 2022, 10:13am UTC](https://forum.opencyphal.org/t/libuavcan-interfacing-with-chibios/1776/1 "2022-10-20T10:13:46Z")
Hi, I’m trying to interface libuavcan with chibios. I’ve made changes to main make file by comparing with libuavcan\libuavcan\_drivers\stm32\test\_stm32f107\Makefile. But I’m getting below error which i’m unable to resolve. I’m new to uavcan, chibios and c++ as well. Please help me to resolve this problem. ```auto from ..libuavcan/libuavcan/include/uavcan/build_config.hpp:32:6: warning: "__cplusplus" is not defined, evaluates to 0 [-Wundef] 32 | # if __cplusplus > 201200 | ^ ~~~~~~~~~~..libuavcan/libuavcan/include/uavcan/build_config.hpp:34:9: warning: "__cplusplus" is not defined, evaluates to 0 [-Wundef] 34 | # elif (__cplusplus > 201100) || defined(__GXX_EXPERIMENTAL_CXX0X__) | ^ ~~~~~~~~~~../libuavcan/libuavcan/include/uavcan/build_config.hpp:210:1: error: unknown type name 'namespace' 210 | namespace uavcan | ^ ~~~~~~~~../libuavcan/libuavcan/include/uavcan/build_config.hpp:211:1: error: expected '=', ',', ';', 'asm' or ' __attribute__' before '{' token 211 | { | ^ ``` ---
**Author:** ![pavel.kirienko](https://forum.opencyphal.org/user_avatar/forum.opencyphal.org/pavel.kirienko/32/9_2.png) [@pavel.kirienko](https://forum.opencyphal.org/u/pavel.kirienko)\ **Post date:** [October 20, 2022, 10:20am UTC](https://forum.opencyphal.org/t/libuavcan-interfacing-with-chibios/1776/2 "2022-10-20T10:20:07Z")
You are trying to include a C++ header file into a C file, this is not permitted, so don’t do that. Also, UAVCAN has ceased to exist. There are two successor projects: DroneCAN for legacy systems, Cyphal for modern systems. More info: - [UAVCAN v1 is now Cyphal](https://forum.opencyphal.org/t/uavcan-v1-is-now-cyphal/1622) - [Yakut monitor with a Babel - #7 by pavel.kirienko](https://forum.opencyphal.org/t/yakut-monitor-with-a-babel/1514/7) ---
**Author:** ![Pramod](https://forum.opencyphal.org/letter_avatar_proxy/v4/letter/p/71c47a/32.png) [@Pramod](https://forum.opencyphal.org/u/Pramod)\ **Post date:** [October 20, 2022, 10:44am UTC](https://forum.opencyphal.org/t/libuavcan-interfacing-with-chibios/1776/3 "2022-10-20T10:44:36Z")
Thankyou @pavel.kirienko. Yes I’ve included header files in main.c file. And renaming it to main.cpp worked. Yes I’ll note that and switch to DroneCAN. Thankyou for your time:)