C++ Linking a custom library built from source (CMakeLists.txt)

Question

1. I built Open3D from source into a /home/user/custom_location/Open3D/build

2. I have a project with a dependency on Open3D and a CMakeLists.txt like this:

cmake_minimum_required(VERSION 3.12)

project(graph_filter)

set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED True)
set(CMAKE_CXX_EXTENSIONS OFF)

# Pybind11
find_package(pybind11 REQUIRED)

# OpenMP
find_package(OpenMP REQUIRED)

# Eigen
find_package(Eigen3 3.3 REQUIRED NO_MODULE)

# Open3D
list(APPEND CMAKE_INSTALL_PREFIX "~/libraries/")
find_package(Open3D HINTS ${CMAKE_INSTALL_PREFIX}/lib/CMake)
list(APPEND Open3D_LIBRARIES dl)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Open3D_CXX_FLAGS}")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${Open3D_EXE_LINKER_FLAGS}")

include_directories(${Open3D_INCLUDE_DIRS})
link_directories(${Open3D_LIBRARY_DIRS})

pybind11_add_module(
    graph_filter
    wrapper.cpp
)
target_link_libraries(graph_filter PRIVATE ${Open3D_LIBRARIES} Eigen3::Eigen OpenMP::OpenMP_CXX)

3. How can I link it? When I run

INSTALL_DIR=/home/user/custom_location/Open3D/build
cmake -S . -B build -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=${INSTALL_DIR}```

I am getting:

Could NOT find Open3D (missing: Open3D_DIR)

fatal error: Open3D/Open3D.h: No such file or directory
    2 | #include <Open3D/Open3D.h>

What is more confusing is the contents of Open3D/build folder after building from source.

I just want to resolve this dependency on Open3D. Thanks for any help!!!