menu example is not working for me

[mrVanDalo]

I'm running NixOS 21.05, but the menu example is not working. (I tried, because I have problems in my project using menu).

nix-shell -p --run "cargo run --example ex_5"
   Compiling libc v0.2.102
   Compiling pkg-config v0.3.19
   Compiling cc v1.0.70
   Compiling ncurses v5.100.0 (/home/palo/dev/ncurses-rs)
warning: variable does not need to be mutable
  --> build.rs:79:9
   |
79 |     let mut build = cc::Build::new();
   |         ----^^^^^
   |         |
   |         help: remove this `mut`
   |
   = note: `#[warn(unused_mut)]` on by default

warning: variable does not need to be mutable
   --> build.rs:104:9
    |
104 |     let mut build = cc::Build::new();
    |         ----^^^^^
    |         |
    |         help: remove this `mut`

warning: unused `Result` that must be used
  --> build.rs:95:5
   |
95 |     file.write_all(&consts.stdout);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(unused_must_use)]` on by default
   = note: this `Result` may be an `Err` variant, which should be handled

warning: unused `Result` that must be used
   --> build.rs:120:5
    |
120 |     file.write_all(&consts.stdout);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: this `Result` may be an `Err` variant, which should be handled

warning: `ncurses` (build script) generated 4 warnings
error: failed to run custom build command for `ncurses v5.100.0 (/home/palo/dev/ncurses-rs)`

Caused by:
  process didn't exit successfully: `/home/palo/dev/ncurses-rs/target/debug/build/ncurses-09f72d651aec0eab/build-script-build` (exit status: 101)
  --- stdout
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=NCURSES5_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=NCURSES5_STATIC
  cargo:rerun-if-env-changed=NCURSES5_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=NCURSES_NO_PKG_CONFIG
  cargo:rerun-if-env-changed=PKG_CONFIG
  cargo:rerun-if-env-changed=NCURSES_STATIC
  cargo:rerun-if-env-changed=NCURSES_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_STATIC
  cargo:rerun-if-env-changed=PKG_CONFIG_ALL_DYNAMIC
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_PATH
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_LIBDIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64-unknown-linux-gnu
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR_x86_64_unknown_linux_gnu
  cargo:rerun-if-env-changed=HOST_PKG_CONFIG_SYSROOT_DIR
  cargo:rerun-if-env-changed=PKG_CONFIG_SYSROOT_DIR
  cargo:rustc-link-lib=ncurses
  OPT_LEVEL = Some("0")
  TARGET = Some("x86_64-unknown-linux-gnu")
  HOST = Some("x86_64-unknown-linux-gnu")
  CC_x86_64-unknown-linux-gnu = None
  CC_x86_64_unknown_linux_gnu = None
  HOST_CC = None
  CC = Some("gcc")
  CFLAGS_x86_64-unknown-linux-gnu = None
  CFLAGS_x86_64_unknown_linux_gnu = None
  HOST_CFLAGS = None
  CFLAGS = None
  CRATE_CC_NO_DEFAULTS = None
  DEBUG = Some("true")
  CARGO_CFG_TARGET_FEATURE = Some("fxsr,sse,sse2")

  --- stderr
  In file included from /nix/store/q141hd8jl7in5223jmf7kmx9h517km4p-glibc-2.32-54-dev/include/assert.h:35,
                   from /home/palo/dev/ncurses-rs/target/debug/build/ncurses-d3ec6d0e162c87ed/out/chtype_size.c:2:
  /nix/store/q141hd8jl7in5223jmf7kmx9h517km4p-glibc-2.32-54-dev/include/features.h:397:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
    397 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)
        |    ^~~~~~~
  /home/palo/dev/ncurses-rs/target/debug/build/ncurses-d3ec6d0e162c87ed/out/chtype_size.c:6:10: fatal error: ncurses.h: No such file or directory
      6 | #include <ncurses.h>
        |          ^~~~~~~~~~~
  compilation terminated.
  thread 'main' panicked at 'assertion failed: command.status().expect(\"compilation failed\").success()', build.rs:166:5
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace