CMake Allegro (from apt) on Debian Stretch

CMakeLists.txt

cmake_minimum_required(VERSION 2.6)
project(Game)

# Set the name of the final binary file
set(bin game)

# Tell CMake where to find the source files (and which to use)
# NOTICE: I am assuming you are like me and you put your source code
# in a src/ directory and your CMakeLists.txt file in the root directory
# of your project.
file(GLOB srcs
    src/*.h
    src/*.cpp
)

# Create the executable
add_executable(${bin} ${srcs})

# Link the allegro library
include_directories(/usr/include/allegro/)
find_library(alleg liballegro.so)
target_link_libraries(${bin} ${alleg})