EGui with glfw in rust

Currently learning openGL in rust and decided to add e-gui, to make immediate changes. Decided to use this crate: https://crates.io/crates/egui_glfw_gl/0.13.1

After adding it to Cargo.toml can't build or run.

PS opengl_t_2> cargo run
   Compiling glfw-sys v3.3.5
error: failed to run custom build command for `glfw-sys v3.3.5`

Caused by:
  process didn't exit successfully: `opengl_t_2\target\debug\build\glfw-sys-d98b92fc73a7f019\build-script-build` (exit code: 101)
  --- stdout
  CMAKE_TOOLCHAIN_FILE_x86_64-pc-windows-msvc = None
  CMAKE_TOOLCHAIN_FILE_x86_64_pc_windows_msvc = None
  HOST_CMAKE_TOOLCHAIN_FILE = None
  CMAKE_TOOLCHAIN_FILE = None
  CMAKE_GENERATOR_x86_64-pc-windows-msvc = None
  CMAKE_GENERATOR_x86_64_pc_windows_msvc = None
  HOST_CMAKE_GENERATOR = None
  CMAKE_GENERATOR = None
  CMAKE_PREFIX_PATH_x86_64-pc-windows-msvc = None
  CMAKE_PREFIX_PATH_x86_64_pc_windows_msvc = None
  HOST_CMAKE_PREFIX_PATH = None
  CMAKE_PREFIX_PATH = None
  CMAKE_x86_64-pc-windows-msvc = None
  CMAKE_x86_64_pc_windows_msvc = None
  HOST_CMAKE = None
  CMAKE = Some("C:\\Program Files\\CMake\\bin\\")
  running: "C:\\Program Files\\CMake\\bin\\" "C:\\Users\\Vasily\\.cargo\\registry\\src\\github.com-1ecc6299db9ec823\\glfw-sys-3.3.5\\." "-G" "Visual Studio 16 2019" "-Thost=x64" "-Ax64" "-DGLFW_BUILD_EXAMPLES=OFF" "-DGLFW_BUILD_TESTS=OFF" "-DGLFW_BUILD_DOCS=OFF" "-DCMAKE_INSTALL_LIBDIR=lib" "-DCMAKE_INSTALL_PREFIX=opengl_t_2\\target\\debug\\build\\glfw-sys-52652cf8f267b532\\out" "-DCMAKE_C_FLAGS= -nologo -MD -Brepro" "-DCMAKE_C_FLAGS_DEBUG= -nologo -MD -Brepro" "-DCMAKE_CXX_FLAGS= -nologo -MD -Brepro" "-DCMAKE_CXX_FLAGS_DEBUG= -nologo -MD -Brepro" "-DCMAKE_ASM_FLAGS= -nologo -MD -Brepro" "-DCMAKE_ASM_FLAGS_DEBUG= -nologo -MD -Brepro" 
"-DCMAKE_BUILD_TYPE=Debug"

  --- stderr
  thread 'main' panicked at '
  failed to execute command: program path has no file name

Cargo.toml:

[dependencies]
cgmath = "0.16.1"
gl = "0.10.0"
image = "0.19.0"
tobj = "0.1.6"
num = "0.2.0"
rand = "0.5.5"
egui = "0.17.0"
egui_glfw_gl = "0.13.1"

[dependencies.glfw]
git = "https://github.com/bjz/glfw-rs.git"
default-features = false

Without egui-glfw, everything builds and I have a functional 3d scene.

File structure

I apologize, if this is a stupid question, but I have already tried everything.

Solution

CMAKE = Some("C:\\Program Files\\CMake\\bin\\")

For whatever reason, your CMAKE environmental variable is pointing to a directory rather than the cmake.exe binary.

Make sure that you have cmake installed, and edit your CMAKE envvar to point to it. Or remove it, if cmake is in your PATH.