Arduino: 1.8.9 (Windows 10), Board: "WEMOS LOLIN32, 80MHz, Default, 921600"

In file included from C:\Users\marc\OneDrive\Documents\Arduino\Mav2PThruUniversal_v2.28\Mav2PThruUniversal_v2.28.ino:2:0:

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_conversions.h:39:1: error: 'MAVLINK_HELPER' does not name a type

 MAVLINK_HELPER void mavlink_quaternion_to_dcm(const float quaternion[4], float dcm[3][3])

 ^

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_conversions.h:69:1: error: 'MAVLINK_HELPER' does not name a type

 MAVLINK_HELPER void mavlink_dcm_to_euler(const float dcm[3][3], float* roll, float* pitch, float* yaw)

 ^

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_conversions.h:103:1: error: 'MAVLINK_HELPER' does not name a type

 MAVLINK_HELPER void mavlink_quaternion_to_euler(const float quaternion[4], float* roll, float* pitch, float* yaw)

 ^

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_conversions.h:119:1: error: 'MAVLINK_HELPER' does not name a type

 MAVLINK_HELPER void mavlink_euler_to_quaternion(float roll, float pitch, float yaw, float quaternion[4])

 ^

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_conversions.h:147:1: error: 'MAVLINK_HELPER' does not name a type

 MAVLINK_HELPER void mavlink_dcm_to_quaternion(const float dcm[3][3], float quaternion[4])

 ^

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_conversions.h:190:1: error: 'MAVLINK_HELPER' does not name a type

 MAVLINK_HELPER void mavlink_euler_to_dcm(float roll, float pitch, float yaw, float dcm[3][3])

 ^

In file included from C:\Users\marc\OneDrive\Documents\Arduino\Mav2PThruUniversal_v2.28\Mav2PThruUniversal_v2.28.ino:4:0:

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_helpers.h: In function 'uint16_t mavlink_finalize_message_buffer(mavlink_message_t*, uint8_t, uint8_t, mavlink_status_t*, uint8_t, uint8_t, uint8_t)':

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_helpers.h:224:16: error: 'MAVLINK_STX' was not declared in this scope

   msg->magic = MAVLINK_STX;

                ^

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_helpers.h: In function 'const mavlink_msg_entry_t* mavlink_get_msg_entry(uint32_t)':

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_helpers.h:501:60: error: 'MAVLINK_MESSAGE_CRCS' was not declared in this scope

  static const mavlink_msg_entry_t mavlink_message_crcs[] = MAVLINK_MESSAGE_CRCS;

                                                            ^

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_helpers.h: In function 'uint8_t mavlink_frame_char_buffer(mavlink_message_t*, mavlink_status_t*, uint8_t, mavlink_message_t*, mavlink_status_t*)':

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_helpers.h:585:12: error: 'MAVLINK_STX' was not declared in this scope

   if (c == MAVLINK_STX)

            ^

In file included from C:\Users\marc\OneDrive\Documents\Arduino\Mav2PThruUniversal_v2.28\Mav2PThruUniversal_v2.28.ino:4:0:

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_helpers.h: In function 'uint8_t mavlink_parse_char(uint8_t, uint8_t, mavlink_message_t*, mavlink_status_t*)':

C:\Users\marc\OneDrive\Documents\Arduino\libraries\c_library_v2-master/mavlink_helpers.h:980:15: error: 'MAVLINK_STX' was not declared in this scope

      if (c == MAVLINK_STX)

               ^

exit status 1
Error compiling for board WEMOS LOLIN32.

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