Compiling with Nix toolchain about hudkit HOT 4 CLOSED

❯ nix-shell --packages pkg-config gtk3 webkitgtk --run make
gcc -std=c11 main.c -o hudkit `pkg-config --cflags --libs gtk+-3.0 webkit2gtk-4.0`
In file included from /nix/store/ch44wa8qqss0dm04lnvf5n7mfh23kmrv-glibc-2.31-74-dev/include/bits/libc-header-start.h:33,
                 from /nix/store/ch44wa8qqss0dm04lnvf5n7mfh23kmrv-glibc-2.31-74-dev/include/limits.h:26,
                 from /nix/store/fvf3qjqa5qpcjjkq37pb6ypnk1mzhf5h-gcc-9.3.0/lib/gcc/x86_64-unknown-linux-gnu/9.3.0/include-fixed/limits.h:194,
                 from /nix/store/fvf3qjqa5qpcjjkq37pb6ypnk1mzhf5h-gcc-9.3.0/lib/gcc/x86_64-unknown-linux-gnu/9.3.0/include-fixed/syslimits.h:7,
                 from /nix/store/fvf3qjqa5qpcjjkq37pb6ypnk1mzhf5h-gcc-9.3.0/lib/gcc/x86_64-unknown-linux-gnu/9.3.0/include-fixed/limits.h:34,
                 from /nix/store/ai5054xzilz0q285c0ldabmkvhyyl6yq-glib-2.64.6/lib/glib-2.0/include/glibconfig.h:11,
                 from /nix/store/cajm8vsbc7726i955nbdz707ij62j9hz-glib-2.64.6-dev/include/glib-2.0/glib/gtypes.h:32,
                 from /nix/store/cajm8vsbc7726i955nbdz707ij62j9hz-glib-2.64.6-dev/include/glib-2.0/glib/galloca.h:32,
                 from /nix/store/cajm8vsbc7726i955nbdz707ij62j9hz-glib-2.64.6-dev/include/glib-2.0/glib.h:30,
                 from /nix/store/cj5dsrxs0pnz3kahpdqlkvj24ir0255z-gtk+3-3.24.21-dev/include/gtk-3.0/gdk/gdkconfig.h:8,
                 from /nix/store/cj5dsrxs0pnz3kahpdqlkvj24ir0255z-gtk+3-3.24.21-dev/include/gtk-3.0/gdk/gdk.h:30,
                 from /nix/store/cj5dsrxs0pnz3kahpdqlkvj24ir0255z-gtk+3-3.24.21-dev/include/gtk-3.0/gtk/gtk.h:30,
                 from main.c:4:
/nix/store/ch44wa8qqss0dm04lnvf5n7mfh23kmrv-glibc-2.31-74-dev/include/features.h:314:53: error: operator '&&' has no right operand
  314 |      || (defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 1) \
      |                                                     ^~
/nix/store/ch44wa8qqss0dm04lnvf5n7mfh23kmrv-glibc-2.31-74-dev/include/features.h:319:48: error: operator '&&' has no right operand
  319 | #if defined _POSIX_C_SOURCE && _POSIX_C_SOURCE >= 2 || defined _XOPEN_SOURCE
      |                                                ^~
main.c: In function ‘main’:
main.c:452:32: warning: implicit declaration of function ‘strtok_r’; did you mean ‘strtok’? [-Wimplicit-function-declaration]
  452 |             for (char *entry = strtok_r(
      |                                ^~~~~~~~
      |                                strtok
main.c:452:32: warning: initialization of ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
main.c:452:13: error: declaration of non-variable ‘strtok_r’ in ‘for’ loop initial declaration
  452 |             for (char *entry = strtok_r(
      |             ^~~
main.c:455:27: warning: assignment to ‘char *’ from ‘int’ makes pointer from integer without a cast [-Wint-conversion]
  455 |                     entry = strtok_r(NULL, ",", &strtok_savepoint)) {
      |                           ^
main.c:713:12: error: variable ‘usr1_action’ has initializer but incomplete type
  713 |     struct sigaction usr1_action = {
      |            ^~~~~~~~~
main.c:714:10: error: ‘struct sigaction’ has no member named ‘sa_handler’
  714 |         .sa_handler = on_signal_sigusr1
      |          ^~~~~~~~~~
main.c:714:23: warning: excess elements in struct initializer
  714 |         .sa_handler = on_signal_sigusr1
      |                       ^~~~~~~~~~~~~~~~~
main.c:714:23: note: (near initialization for ‘usr1_action’)
main.c:713:22: error: storage size of ‘usr1_action’ isn’t known
  713 |     struct sigaction usr1_action = {
      |                      ^~~~~~~~~~~
main.c:716:5: warning: implicit declaration of function ‘sigaction’ [-Wimplicit-function-declaration]
  716 |     sigaction(SIGUSR1, &usr1_action, NULL);
      |     ^~~~~~~~~
make: *** [makefile:2: hudkit] Error 1