run makefile console error in Centos 7.8

[rjzou]

/www/wwwroot/telebot/src/telebot-parser.c: In function ‘telebot_parser_get_photos’:
/www/wwwroot/telebot/src/telebot-parser.c:881:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int index = 0; index < array_len; index++)
^
/www/wwwroot/telebot/src/telebot-parser.c: In function ‘telebot_parser_get_poll_answer’:
/www/wwwroot/telebot/src/telebot-parser.c:1447:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int index = 0; index < answer->count_option_ids; index++)
^
/www/wwwroot/telebot/src/telebot-parser.c: In function ‘telebot_parser_get_poll’:
/www/wwwroot/telebot/src/telebot-parser.c:1578:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int index = 0; index < poll->count_options; index++)
^
/www/wwwroot/telebot/src/telebot-parser.c: In function ‘telebot_parser_get_user_profile_photos’:
/www/wwwroot/telebot/src/telebot-parser.c:1624:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int i = 0; i < 4; i++)
^
/www/wwwroot/telebot/src/telebot-parser.c:1629:14: error: redefinition of ‘i’
for (int i = 0; i < total; i++)
^
/www/wwwroot/telebot/src/telebot-parser.c:1624:14: note: previous definition of ‘i’ was here
for (int i = 0; i < 4; i++)
^
/www/wwwroot/telebot/src/telebot-parser.c:1629:5: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int i = 0; i < total; i++)
^
/www/wwwroot/telebot/src/telebot-parser.c:1635:9: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int j = 0; j < subtotal; j++)
^
/www/wwwroot/telebot/src/telebot-parser.c:1644:9: error: ‘for’ loop initial declarations are only allowed in C99 mode
for (int i = 0; i < 4; i++)
^
make[3]: *** [CMakeFiles/telebot.dir/src/telebot-parser.c.o] Error 1
make[2]: *** [CMakeFiles/telebot.dir/all] Error 2
make[1]: *** [test/CMakeFiles/echobot.dir/rule] Error 2
make: *** [echobot] Error 2

[rjzou]

cmake version 3.20.0

CMake suite maintained and supported by Kitware (kitware.com/cmake).

[rjzou]

GNU Make 3.82
Built for x86_64-redhat-linux-gnu
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

[smartnode]

Add -std=c99 compiler option in CMakeLists.txt and build again. As below :

SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${EXTRA_LIB_CFLAGS} -Werror -Wall -Wno-unused-function -std=c99" )