What do you mean with webrtc keywords ?

add_executable(Simple_WebRtc_Cpp_Linux

    main.cpp
    webrtc/rtc_connection.h

    webrtc/rtc_wrapper.h webrtc/rtc_ice.h)

n file included from /usr/include/stdint.h:26,
from /usr/lib/gcc/x86_64-linux-gnu/9/include/stdint.h:9,
from /usr/include/c++/9/bits/atomic_base.h:36,
from /usr/include/c++/9/atomic:41,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/feature_list.h:8,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/features.h:9,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/type_traits:38,
from /usr/include/c++/9/ratio:38,
from /usr/include/c++/9/chrono:38,
from /usr/include/c++/9/condition_variable:38,
from /media/evehal/Other/ubuntu/projects/simple-webrtc-cpp-linux-main/main.cpp:1:
/usr/include/x86_64-linux-gnu/bits/libc-header-start.h:56:17: error: missing binary operator before token "("
56 | #if __GLIBC_USE (IEC_60559_BFP_EXT) || __GLIBC_USE (ISOC2X)
| ^
/usr/include/x86_64-linux-gnu/bits/libc-header-start.h:73:17: error: missing binary operator before token "("
73 | #if __GLIBC_USE (IEC_60559_FUNCS_EXT) || __GLIBC_USE (ISOC2X)
| ^
In file included from /usr/lib/gcc/x86_64-linux-gnu/9/include/stdint.h:9,
from /usr/include/c++/9/bits/atomic_base.h:36,
from /usr/include/c++/9/atomic:41,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/feature_list.h:8,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/features.h:9,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/type_traits:38,
from /usr/include/c++/9/ratio:38,
from /usr/include/c++/9/chrono:38,
from /usr/include/c++/9/condition_variable:38,
from /media/evehal/Other/ubuntu/projects/simple-webrtc-cpp-linux-main/main.cpp:1:
/usr/include/stdint.h:276:17: error: missing binary operator before token "("
276 | #if __GLIBC_USE (IEC_60559_BFP_EXT_C2X)
| ^
In file included from /usr/include/sched.h:34,
from /usr/include/pthread.h:22,
from /usr/include/x86_64-linux-gnu/c++/9/bits/gthr-default.h:35,
from /usr/include/x86_64-linux-gnu/c++/9/bits/gthr.h:148,
from /usr/include/c++/9/ext/atomicity.h:35,
from /usr/include/c++/9/bits/basic_string.h:39,
from /usr/include/c++/9/string:55,
from /usr/include/c++/9/stdexcept:39,
from /usr/include/c++/9/array:39,
from /usr/include/c++/9/tuple:39,
from /usr/include/c++/9/functional:54,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/feature_list.h:9,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/features.h:9,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/type_traits:38,
from /usr/include/c++/9/ratio:38,
from /usr/include/c++/9/chrono:38,
from /usr/include/c++/9/condition_variable:38,
from /media/evehal/Other/ubuntu/projects/simple-webrtc-cpp-linux-main/main.cpp:1:
/usr/include/time.h:125:40: error: missing binary operator before token "("
125 | #if defined __USE_POSIX || __GLIBC_USE (ISOC2X)
| ^
/usr/include/time.h:144:40: error: missing binary operator before token "("
144 | #if defined __USE_POSIX || __GLIBC_USE (ISOC2X)
| ^
In file included from /usr/include/sched.h:44,
from /usr/include/pthread.h:22,
from /usr/include/x86_64-linux-gnu/c++/9/bits/gthr-default.h:35,
from /usr/include/x86_64-linux-gnu/c++/9/bits/gthr.h:148,
from /usr/include/c++/9/ext/atomicity.h:35,
from /usr/include/c++/9/bits/basic_string.h:39,
from /usr/include/c++/9/string:55,
from /usr/include/c++/9/stdexcept:39,
from /usr/include/c++/9/array:39,
from /usr/include/c++/9/tuple:39,
from /usr/include/c++/9/functional:54,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/feature_list.h:9,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/features.h:9,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/type_traits:38,
from /usr/include/c++/9/ratio:38,
from /usr/include/c++/9/chrono:38,
from /usr/include/c++/9/condition_variable:38,
from /media/evehal/Other/ubuntu/projects/simple-webrtc-cpp-linux-main/main.cpp:1:
/usr/include/x86_64-linux-gnu/bits/cpu-set.h:45:19: error: missing binary operator before token "("
45 | #if __GNUC_PREREQ (2, 91)
| ^
/usr/include/x86_64-linux-gnu/bits/cpu-set.h:83:19: error: missing binary operator before token "("
83 | #if __GNUC_PREREQ (2, 91)
| ^
In file included from /usr/include/stdio.h:27,
from /usr/include/c++/9/cstdio:42,
from /usr/include/c++/9/ext/string_conversions.h:43,
from /usr/include/c++/9/bits/basic_string.h:6496,
from /usr/include/c++/9/string:55,
from /usr/include/c++/9/stdexcept:39,
from /usr/include/c++/9/array:39,
from /usr/include/c++/9/tuple:39,
from /usr/include/c++/9/functional:54,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/feature_list.h:9,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/features.h:9,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/type_traits:38,
from /usr/include/c++/9/ratio:38,
from /usr/include/c++/9/chrono:38,
from /usr/include/c++/9/condition_variable:38,
from /media/evehal/Other/ubuntu/projects/simple-webrtc-cpp-linux-main/main.cpp:1:
/usr/include/x86_64-linux-gnu/bits/libc-header-start.h:56:17: error: missing binary operator before token "("
56 | #if __GLIBC_USE (IEC_60559_BFP_EXT) || __GLIBC_USE (ISOC2X)
| ^
/usr/include/x86_64-linux-gnu/bits/libc-header-start.h:73:17: error: missing binary operator before token "("
73 | #if __GLIBC_USE (IEC_60559_FUNCS_EXT) || __GLIBC_USE (ISOC2X)
| ^
In file included from /usr/include/c++/9/cstdio:42,
from /usr/include/c++/9/ext/string_conversions.h:43,
from /usr/include/c++/9/bits/basic_string.h:6496,
from /usr/include/c++/9/string:55,
from /usr/include/c++/9/stdexcept:39,
from /usr/include/c++/9/array:39,
from /usr/include/c++/9/tuple:39,
from /usr/include/c++/9/functional:54,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/feature_list.h:9,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/features.h:9,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/type_traits:38,
from /usr/include/c++/9/ratio:38,
from /usr/include/c++/9/chrono:38,
from /usr/include/c++/9/condition_variable:38,
from /media/evehal/Other/ubuntu/projects/simple-webrtc-cpp-linux-main/main.cpp:1:
/usr/include/stdio.h:290:43: error: missing binary operator before token "("
290 | #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
| ^
/usr/include/stdio.h:363:17: error: missing binary operator before token "("
363 | #if __GLIBC_USE (LIB_EXT2)
| ^
/usr/include/stdio.h:405:18: error: missing binary operator before token "("
405 | #if !__GLIBC_USE (DEPRECATED_SCANF) && !defined __LDBL_COMPAT
| ^
/usr/include/stdio.h:567:17: error: missing binary operator before token "("
567 | #if __GLIBC_USE (DEPRECATED_GETS)
| ^
/usr/include/stdio.h:592:43: error: missing binary operator before token "("
592 | #if defined __USE_XOPEN2K8 || __GLIBC_USE (LIB_EXT2)
| ^
In file included from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/build/build_config.h:82,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/compiler_specific.h:8,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/feature_list.h:17,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/features.h:9,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/type_traits:38,
from /usr/include/c++/9/ratio:38,
from /usr/include/c++/9/chrono:38,
from /usr/include/c++/9/condition_variable:38,
from /media/evehal/Other/ubuntu/projects/simple-webrtc-cpp-linux-main/main.cpp:1:
/usr/include/assert.h:37:42: error: missing binary operator before token "("
37 | #if defined __cplusplus && __GNUC_PREREQ (2,95)
| ^
In file included from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/check.h:12,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/containers/flat_map.h:13,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/feature_list.h:18,
from /media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/features.h:9,
from /usr/include/x86_64-linux-gnu/c++/9/bits/os_defines.h:39,
from /usr/include/x86_64-linux-gnu/c++/9/bits/c++config.h:528,
from /usr/include/c++/9/type_traits:38,
from /usr/include/c++/9/ratio:38,
from /usr/include/c++/9/chrono:38,
from /usr/include/c++/9/condition_variable:38,
from /media/evehal/Other/ubuntu/projects/simple-webrtc-cpp-linux-main/main.cpp:1:
/media/evehal/Other/ubuntu/webrtc_build/webrtc-checkout4147/src/base/dcheck_is_on.h:8:10: fatal error: base/debug/debugging_buildflags.h: No such file or directory
8 | #include "base/debug/debugging_buildflags.h"
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~