Linking against external library with CMake - cmake

Question

I'm currently at a bit of a loss when trying to use the Libspotify SDK in my CMake project.
CMakeLists.txt:
cmake_minimum_required(VERSION 3.2)
project(spotti)
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/modules/")
find_package(Spotify REQUIRED)
include_directories(${Spotify_INCLUDE_DIR})
set(LIBS ${LIBS} ${Spotify_LIBRARIES})
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -pthread")
set(SOURCE_FILES main.cpp)
add_executable(spotti ${SOURCE_FILES})
FindSpotify.cmake:
# - Find Spotify
# Find the native Google Sparse Hash Etc includes
#
# Spotify_INCLUDE_DIR - where to find sparse_hash_set, etc.
# Spotify_FOUND - True if Spotify found.
if (Spotify_INCLUDE_DIR)
# Already in cache, be silent
set(Spotify_FIND_QUIETLY TRUE)
endif ()
find_path(Spotify_INCLUDE_DIR api.h PATHS
/opt/local/include/libspotify
/usr/local/include/libspotify
/usr/include/libspotify
/home/denvercoder21/Development/cpp/spotti/libspotify/include/libspotify/
)
set(Spotify_LIB_PATHS /usr/local/lib /opt/local/lib /home/denvercoder21/Development/cpp/spotti/libspotify/lib/)
find_library(Spotify_LIB NAMES spotify PATHS ${Spotify_LIB_PATHS})
if (Spotify_INCLUDE_DIR AND Spotify_LIB)
set(Spotify_FOUND TRUE)
else ()
set(Spotify_FOUND FALSE)
endif ()
if (Spotify_FOUND)
if (NOT Spotify_FIND_QUIETLY)
message(STATUS "Found Spotify: ${Spotify_INCLUDE_DIR}")
endif ()
else ()
message(STATUS "Not Found Spotify: ${Spotify_INCLUDE_DIR}")
if (Spotify_FIND_REQUIRED)
message(FATAL_ERROR "Could NOT find Spotify includes")
endif ()
endif ()
mark_as_advanced(
Spotify_LIB
Spotify_INCLUDE_DIR
)
My libspotify folder is in the project root directory. I think I might be missing a target_link_libraries() in my CMakeLists.txt. Or not?
Anyway, CMake runs without errors with these files, but compiling my project gives me undefined reference errors. What's wrong?

Answer 1

I think I might be missing a target_link_libraries() in my CMakeLists.txt.
Yes, you should explicitly link with Spotify:
target_link_libraries(spotti Spotify)
find_package() does not perform automatic linking.