This is how to proceed, step by step:

1. The CMakeLists.txt file starts with the minimum version requirement, project name, and supported language:

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)

project(recipe-04 LANGUAGES CXX)

set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

2. We wish to build the hello-conda executable, which is built from example.cpp:

add_executable(hello-conda "")

target_sources(hello-conda
  PRIVATE
    example.cpp
  )

3. We conclude CMakeLists.txt by defining the install target:

install(
  TARGETS
    hello-conda
  DESTINATION
    bin
  )

4. We will describe the Conda package in a file called meta.yaml, which we will place under conda-recipe to arrive at the following file structure:

.
├── CMakeLists.txt
├── conda-recipe
│   └── meta.yaml
└── example.cpp

5. The meta.yaml file consists of the following:

package:
  name: conda-example-simple
  version: "0.0.0"

source:
  path: ../ # this can be changed to git-url

build:
  number: 0
  binary_relocation: true
  script:
    - cmake -H. -Bbuild_conda -G "${CMAKE_GENERATOR}" -DCMAKE_INSTALL_PREFIX=${PREFIX} # [not win]
    - cmake -H. -Bbuild_conda -G "%CMAKE_GENERATOR%" -DCMAKE_INSTALL_PREFIX="%LIBRARY_PREFIX%" # [win]
    - cmake --build build_conda --target install

requirements:
  build:
    - cmake >=3.5
    - {{ compiler('cxx') }}

about:
  home: http://www.example.com
  license: MIT
  summary: "Summary in here ..."

6. Now we can try to build the package:

$ conda build conda-recipe

7. We will see lots of output on the screen, but once the build is complete, we can install the package. We will do this first locally:

$ conda install --use-local conda-example-simple

8. Now we are ready to test it – open a new terminal (assuming Anaconda is activated) and type the following:

$ hello-conda

hello from your conda package!

9. After the successful test, we can remove the package again:

$ conda remove conda-example-simple