I receive type error during compile operation ...

[TeaCult]

g++ -O3 -Wall -Werror -pedantic -c src/main.cpp
src/main.cpp: In function ‘int readPPMImage(const char*, size_t*, size_t*, rgb_t**)’:
src/main.cpp:60:4: error: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Werror=unused-result]
    (void)fgets(line, 0x80, fp);
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~
src/main.cpp:76:2: error: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Werror=unused-result]
  (void)fread(*buffer, sizeof(rgb_t), *width * *height, fp);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1plus: all warnings being treated as errors
Makefile:5: recipe for target 'main.o' failed
make: *** [main.o] Error 1

Linux 5.3.0-53-generic #47~18.04.1-Ubuntu SMP Thu May 7 13:10:50 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

cuda 10.2 - 2070 Super

g++ (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0