I found out that nix-shell might work better than nix shell:
Now I am this far:
nix-shell -p meson pkg-config wayland cmake \
binutils libdrm mesa \
libinput libxkbcommon pixman wayland-protocols \
libseat ninja xwayland xorg.xcbproto xorg.xcbutil libglvnd
--run 'source foo/bin/activate && pip3 install git+https://github.com/jbuchermn/pywm'
leads to the following error when linking pywm:
...
[385/412] Compiling C object pywm.p/src_wm_wm_idle_inhibit.c.o
[386/412] Compiling C object pywm.p/src_wm_wm_view_xwayland.c.o
../src/wm/wm_view_xwayland.c: In function ‘wm_view_xwayland_set_resizing’:
../src/wm/wm_view_xwayland.c:341:30: warning: unused variable ‘view’ [-Wunused-variable]
341 | struct wm_view_xwayland* view = wm_cast(wm_view_xwayland, super);
| ^~~~
../src/wm/wm_view_xwayland.c: In function ‘wm_view_xwayland_structure_printf’:
../src/wm/wm_view_xwayland.c:431:30: warning: unused variable ‘view’ [-Wunused-variable]
431 | struct wm_view_xwayland* view = wm_cast(wm_view_xwayland, super);
| ^~~~
[387/412] Compiling C object pywm.p/src_wm_wm_drag.c.o
[388/412] Compiling C object pywm.p/src_main.c.o
[389/412] Compiling C object pywm.p/src_wm_wm_view_xdg.c.o
[390/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_pointer.c.o
[391/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm.c.o
[392/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_seat.c.o
[393/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_server.c.o
[394/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_renderer.c.o
[395/412] Linking target pywm
FAILED: pywm
gcc -o pywm pywm.p/src_wm_wm.c.o pywm.p/src_wm_wm_server.c.o pywm.p/src_wm_wm_renderer.c.o pywm.p/src_wm_wm_seat.c.o pywm.p/src_wm_wm_keyboard.c.o pywm.p/src_wm_wm_pointer.c.o pywm.p/src_wm_wm_cursor.c.o pywm.p/src_wm_wm_layout.c.o pywm.p/src_wm_wm_output.c.o pywm.p/src_wm_wm_content.c.o pywm.p/src_wm_wm_view.c.o pywm.p/src_wm_wm_view_xdg.c.o pywm.p/src_wm_wm_view_xwayland.c.o pywm.p/src_wm_wm_widget.c.o pywm.p/src_wm_wm_config.c.o pywm.p/src_wm_wm_idle_inhibit.c.o pywm.p/src_wm_wm_drag.c.o pywm.p/src_main.c.o -Wl,--as-needed -Wl,--no-undefined -Wl,--start-group subprojects/wlroots/libwlroots.a protocols/libserver_protos.a /nix/store/kw2y4gc6cmpf7riivgbw20zk4dj3sakr-wayland-1.19.0/lib/libwayland-server.so /nix/store/kw2y4gc6cmpf7riivgbw20zk4dj3sakr-wayland-1.19.0/lib/libwayland-client.so /nix/store/kgzhnlza09sw2kzzvmp3jp0bypsglqkp-libdrm-2.4.108/lib/libdrm.so /nix/store/ws9s478q7w6c1fyh09ip1191ih7mq30c-mesa-21.2.5/lib/libgbm.so /nix/store/xn0sxi1zp7i1q3p44z00inn7fi1d37bz-libinput-1.19.1/lib/libinput.so /nix/store/kkil66hbhaf83pv9p3h2agckkyrlfbxa-libxkbcommon-1.3.1/lib/libxkbcommon.so /nix/store/q0881awy50g4srnnwasci37y2jk5sf99-systemd-249.5/lib/libudev.so /nix/store/8vj9db5pi3wxmmaggksd2adjdq1ngz35-pixman-0.38.4/lib/libpixman-1.so -lm -lrt /nix/store/ar18dm5xdnn9khdmi4g5s4sgmp563zg1-libglvnd-1.3.4/lib/libEGL.so /nix/store/ar18dm5xdnn9khdmi4g5s4sgmp563zg1-libglvnd-1.3.4/lib/libGLESv2.so /nix/store/q44id8j4jsl6h8mjwc7dmp3ir6x2lnx1-seatd-0.6.3/lib/libseat.so -lpthread -Wl,--end-group
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_server.c.o: in function `handle_new_xwayland_surface':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_server.c:99: undefined reference to `wlr_xwayland_surface_ping'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_server.c.o: in function `wm_server_init':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_server.c:248: undefined reference to `wlr_xwayland_set_seat'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: /run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_server.c:217: undefined reference to `wlr_xwayland_create'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: /run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_server.c:231: undefined reference to `wlr_xwayland_set_cursor'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_server.c.o: in function `wm_server_destroy':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_server.c:303: undefined reference to `wlr_xwayland_destroy'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_view_xwayland.c.o: in function `wm_view_xwayland_request_close':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_view_xwayland.c:294: undefined reference to `wlr_xwayland_surface_close'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_view_xwayland.c.o: in function `wm_view_xwayland_set_maximized':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_view_xwayland.c:351: undefined reference to `wlr_xwayland_surface_set_maximized'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_view_xwayland.c.o: in function `wm_view_xwayland_set_fullscreen':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_view_xwayland.c:347: undefined reference to `wlr_xwayland_surface_set_fullscreen'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_view_xwayland.c.o: in function `wm_view_xwayland_request_size':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_view_xwayland.c:288: undefined reference to `wlr_xwayland_surface_configure'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_view_xwayland.c.o: in function `child_handle_request_configure':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_view_xwayland.c:102: undefined reference to `wlr_xwayland_surface_configure'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_view_xwayland.c.o: in function `handle_request_configure':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_view_xwayland.c:130: undefined reference to `wlr_xwayland_surface_configure'
/nix/store/js66s0xwjnzg0ggi2lq9bcvlk6x2za13-binutils-2.35.2/bin/ld: pywm.p/src_wm_wm_view_xwayland.c.o: in function `wm_view_xwayland_set_activated':
/run/user/1000/pip-req-build-g312bqsv/build/../src/wm/wm_view_xwayland.c:355: undefined reference to `wlr_xwayland_surface_activate'
collect2: error: ld returned 1 exit status
[396/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_layout.c.o
[397/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_cursor.c.o
[398/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_keyboard.c.o
[399/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_output.c.o
[400/412] Compiling C object _pywm.cpython-39-x86_64-linux-gnu.so.p/src_wm_wm_content.c.o
ninja: build stopped: subcommand failed.