OPEN] C++ Can't Run Code With External Library (SNMP++) [duplicate]

I followed the instructions but it seems my question got closed without even reading what my problem is

I have downloaded SNMP++ 3.4.9 library and copied it to my project's directory (where my project name is SNMP)

So my directory looks like this:

>snmp++-3.4.9    [Folder]
    >Include            [Sub-Folder]
    >Examples           [Sub-Folder]
    libsnmp.h      
CMakeLists.txt
main.cpp

Inside main.cpp I have pasted a code example that uses the library like this (first few lines):

#include <libsnmp.h>
#include "snmp_pp/snmp_pp.h"
...

When I try to run the code it won't work, I get:

[1/2] Building CXX object CMakeFiles/SNMP.dir/main.cpp.o
FAILED: CMakeFiles/SNMP.dir/main.cpp.o 
.../XcodeDefault.xctoolchain/usr/bin/c++  -I/snmp++-3.4.9 -g -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX12.1.sdk -std=gnu++14 -MD -MT CMakeFiles/SNMP.dir/main.cpp.o -MF CMakeFiles/SNMP.dir/main.cpp.o.d -o CMakeFiles/SNMP.dir/main.cpp.o -c /Users/john/CLionProjects/SNMP/main.cpp
/Users/john/CLionProjects/SNMP/main.cpp:28:10: fatal error: 'libsnmp.h' file not found
#include <libsnmp.h>
         ^~~~~~~~~~~
1 error generated.
ninja: build stopped: subcommand failed.

Someone suggested changing my CMakeLists.txt file to something like this:

cmake_minimum_required(VERSION 3.21)
project(SNMP)

set(CMAKE_CXX_STANDARD 11)
include_directories("/snmp++-3.4.9")

add_executable(SNMP main.cpp)

But still same problem, how can I fix this?

Please Note: From a previous understanding I had with C++ I don't get it why they wrote:

#include <libsnmp.h>

and not:

#include "libsnmp.h"

As It's not a standard library, and changing every instance from <> to "" will take a very long time (and doesn't sound the right thing to do)

I'm using CLion and working on macOS.