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.gitignore

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+build/*

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.6)
+
+set(PROJECT_N hello)
+
+SET(CMAKE_C_COMPILER /home/user/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android22-clang)
+SET(CMAKE_CXX_COMPILER /home/user/Android/Sdk/ndk/21.0.6113669/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android22-clang++)
+
+project(${PROJECT_N} VERSION 1.0)
+
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED True)
+
+file(GLOB_RECURSE SRCS ${PROJECT_SOURCE_DIR}/src/*.cpp)
+
+# a macro that gets all of the header containing directories. 
+MACRO(header_directories return_list includes_base_folder extention )
+    FILE(GLOB_RECURSE new_list ${includes_base_folder}/*.${extention})
+    SET(dir_list "")
+    FOREACH(file_path ${new_list})
+        GET_FILENAME_COMPONENT(dir_path ${file_path} PATH)
+        SET(dir_list ${dir_list} ${dir_path})
+    ENDFOREACH()
+    LIST(REMOVE_DUPLICATES dir_list)
+    SET(${return_list} ${dir_list})
+ENDMACRO()
+
+# using said macro.
+header_directories(INCLUDES ${PROJECT_SOURCE_DIR}/include/ hpp)
+
+message("src files:")
+foreach(file ${SRCS})
+        message(STATUS ${file})
+endforeach()
+
+message("include directories:")
+foreach(dir ${INCLUDES})
+        message(STATUS ${dir})
+endforeach()
+add_executable(${PROJECT_N} ${SRCS})
+
+target_include_directories(${PROJECT_N} PUBLIC include)

src/main.cpp

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+#include <iostream>
+int main(int argc, char const *argv[])
+{
+    std::cout<< "Hello World!" << std::endl;
+    return 0;
+}