Linking a C library (tree-sitter) into a C++ project cmake issues - c++

Question

I'm trying to get a C library called tree-sitter working with my C++ project.
This is what my project structure looks like:
IDEProject
cmake-build-debug
Headers
Sources
tree-sitter (The library I want to include)
tree-sitter-json (The library that provides a parser I need to use with tree-sitter)
CMakeLists.txt
My CMakeLists.txt looks like this:
cmake_minimum_required(VERSION 3.1.0)
project(IDEProject)
set (CMAKE_PREFIX_PATH "/Users/Chloe/Qt/5.12.0/clang_64")
set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
# Find includes in corresponding build directories
find_package(Qt5 REQUIRED COMPONENTS Core Widgets Gui Test)
include_directories(Headers)
include_directories(Sources)
file(GLOB project_headers Headers/*.h)
file(GLOB project_sources Sources/*.cpp)
file(GLOB project_forms Forms/*.ui)
# qt_wrap_cpp(project_headers_wrapped ${project_headers})
set(CMAKE_INCLUDE_CURRENT_DIR ON)
# Instruct CMake to run moc automatically when needed
set(CMAKE_AUTOMOC ON)
# Create code from a list of Qt designer ui files
# set(CMAKE_AUTOUIC ON)
add_executable(IDEProject ${project_headers} ${project_sources} ${project_forms})
# Use the Widgets module from Qt 5
target_link_libraries(IDEProject PUBLIC Qt5::Core Qt5::Widgets Qt5::Gui)
add_library(tree-lib tree-sitter/lib/src/lib.c)
include_directories(
tree-sitter/lib/src
tree-sitter/lib/include
tree-sitter/lib/utf8proc
)
target_link_libraries(IDEProject PRIVATE tree-lib)
After compiling that, I get this error:
Undefined symbols for architecture x86_64:
"tree_sitter_json()", referenced from:
PlainTextEdit::onTextChanged() in TextEditor.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
The code that my program tries to run is this:
TSLanguage *tree_sitter_json();
TSParser *parser = ts_parser_new();
ts_parser_set_language(parser, tree_sitter_json());
NOTE: All the info regarding tree-sitter is taken from this website: https://tree-sitter.github.io/tree-sitter/using-parsers#an-example-program
Help would really really be appreciated since I've been trying to solve this problem for over 2 days now