CMake - Build still succeeded even without the frameworks to be included - ios

Question

I downloaded the project of minicap-ios and planned to play with it and study CMake at the same time. The project will be compiled with CMake after executing ./build.sh.
Here is the content of build.sh:
mkdir build
cd build
cmake ../
make
Here is the content of the CMakeLists.txt
cmake_minimum_required(VERSION 3.5.2)
project(ios_minicap)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x -Wall -g")
set(SOURCE_FILES
src/minicap.cpp
src/SimpleServer.cpp src/SimpleServer.hpp
src/FrameListener.cpp src/FrameListener.hpp
src/Banner.cpp src/Banner.hpp
src/JpegEncoder.cpp src/JpegEncoder.hpp
src/StreamClient.mm src/StreamClient.h
src/Frame.hpp)
add_executable(ios_minicap ${SOURCE_FILES})
include_directories(
/usr/local/opt/jpeg-turbo/include
)
target_link_libraries (ios_minicap
"-framework Foundation"
"-framework CoreFoundation"
"-framework CoreMedia"
"-framework CoreVideo"
"-framework CoreMediaIO"
"-framework AVFoundation"
/usr/local/opt/jpeg-turbo/lib/libturbojpeg.a)
As can be seen, some iOS frameworks are used in here. So when building the project, I would expect that CMake will go look for the frameworks needed by the project.
I tried building the project with all requirements set. The building goes successful. You can also see the path of the required frameworks:
Then I tried removing those frameworks, reran build.sh. Here's what I got:
Now, the frameworks were not included in the building process I guess. But what confuses me is that the building still succeeded with no error. Why is that so?