adding in build setup and linking external library

.gitignore

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+build/
+
+*.so

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.10)
+
+project(gtk_hello_world)
+
+set(CMAKE_CXX_STANDARD 17)
+
+find_package(PkgConfig)
+
+pkg_check_modules(GTKMM gtkmm-4.0)
+
+set (source_dir "${PROJECT_SOURCE_DIR}/src")
+file(GLOB source_files "${source_dir}/*.cpp")
+
+link_directories(${GTKMM_LIBRARY_DIRS})
+include_directories(${GTKMM_INCLUDE_DIRS})
+
+add_executable(${PROJECT_NAME} ${source_files})
+
+target_link_libraries(${PROJECT_NAME} ${GTKMM_LIBRARIES})

build.sh

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+#!/bin/sh
+
+echo "Building project | making build folder, and going into it..."
+rm -rf build
+mkdir build
+cd build
+
+echo "Running cmake with build type Debug."
+cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Debug ..
+
+echo "====================="
+echo "Running make..."
+echo "====================="
+
+make

src/main.cpp

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+#include <gtkmm.h>
+
+class MyWindow : public Gtk::Window {
+public:
+  MyWindow();
+};
+
+MyWindow::MyWindow() {
+  set_title("Basic application");
+  set_default_size(800, 450);
+}
+
+int main(int argc, char **argv) {
+  auto app = Gtk::Application::create("org.gtkmm.examples.base");
+  return app->make_window_and_run<MyWindow>(argc, argv);
+}