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Thanks to kyechou patch, managed to build. The package needs to be updated.

I encountered the same compilation issue as @tenebraus did. Here's a patch to fix the problem:

diff --git a/include/tradstdc.h b/include/tradstdc.h
index 12a0d4a..710a89d 100644
--- a/include/tradstdc.h
+++ b/include/tradstdc.h
@@ -431,7 +431,7 @@ typedef genericptr genericptr_t; /* (void *) or (char *) */
 #define NORETURN __attribute__((noreturn))
 /* disable gcc's __attribute__((__warn_unused_result__)) since explicitly
    discarding the result by casting to (void) is not accepted as a 'use' */
-#define __warn_unused_result__ /*empty*/
+#define __warn_unused_result__ __unused__
 #define warn_unused_result /*empty*/
 #endif
 #endif

Hey, I'm having trouble compiling this package. Here goes the log below. It has something to do with cdefs.h, and I'm not sure if it's in my end or in the package's.

==> Criando o pacote: nethack-x11 3.6.6-1 (dom 21 ago 2022 19:45:17)
==> Verificando as dependências de tempo de execução...
==> Verificando as dependências de tempo de compilação...
==> Obtendo fontes...
  -> Encontrado nethack-366-src.tgz
  -> Encontrado nethack-x11.patch
  -> Encontrado nethack-x11.png
==> Validando source arquivos com sha256sums...
    nethack-366-src.tgz ... Passou
    nethack-x11.patch ... Passou
    nethack-x11.png ... Passou
==> Extraindo fontes...
  -> Extraindo nethack-366-src.tgz com bsdtar
==> Iniciando prepare()...
[nethack-x11]                     Generating desktop file... ok
patching file include/config.h
patching file include/unixconf.h
patching file src/invent.c
Hunk #1 succeeded at 3532 (offset 49 lines).
patching file sys/unix/Makefile.src
patching file sys/unix/Makefile.top
==> Removendo diretório $pkgdir/ existente...
==> Iniciando build()...
( cd src ; make )
make[1]: Entrando no diretório '/Seagate/Downloads/nethack-x11/src/NetHack-NetHack-3.6.6_Released/src'

touch ../src/config.h-t
cc -g -O -I../include -DNOTPARMDECL -DDLB -DCOMPRESS=\"/bin/gzip\" -DCOMPRESS_EXTENSION=\".gz\" -DSYSCF -DSYSCF_FILE=\"/var/games/nethack/sysconf\" -DSECURE -DTIMED_DELAY -DHACKDIR=\"/var/games/nethack/\" -DDUMPLOG -DCONFIG_ERROR_SECURE=FALSE -c monst.c
In file included from monst.c:6:
../include/config.h:314: warning: "DLB" re-definido
  314 | #define DLB /* not supported on all platforms */
      |
<command-line>: note: essa é a localização da definição anterior
../include/config.h:365: warning: "SECURE" re-definido
  365 | #define SECURE /* do setuid(getuid()) after chdir() */
      |
<command-line>: note: essa é a localização da definição anterior
In file included from /usr/include/features.h:490,
                 from /usr/include/bits/libc-header-start.h:33,
                 from /usr/include/stdio.h:27,
                 from ../include/global.h:9,
                 from ../include/config.h:581:
/usr/include/sys/cdefs.h:405:73: error: macro "__has_attribute" requires an identifier
  405 | #if __GNUC_PREREQ (3,4) || __glibc_has_attribute (__warn_unused_result__)
      |                                                                         ^
In file included from ../include/global.h:136:
../include/unixconf.h:136: warning: "TIMED_DELAY" re-definido
  136 | #define TIMED_DELAY /* usleep() */
      |
<command-line>: note: essa é a localização da definição anterior
make[1]: *** [Makefile:657: monst.o] Erro 1
make[1]: Saindo do diretório '/Seagate/Downloads/nethack-x11/src/NetHack-NetHack-3.6.6_Released/src'

make: *** [Makefile:161: nethack] Erro 2
==> ERRO: Uma falha ocorreu em build().
    Abortando...

Hi jfcg, thanks for showing interest in this package.

• Alternate tilesets are outside the scope of this package. If you would like to add some, feel free to fork this package :)
• You can set numpad in-game with shift-O, or in your .nethackrc. If you would like to change the defaults, I suggest creating a patch upstream.

Hi,

Thanks for the nethack-x11 package. I have some suggestions to improve first time user experience:

• 32x32 tilesets (https://nethackwiki.com/wiki/Tileset) Dawnhack looks more appealing than the default 32x32 tileset. Nevanda looks even better but after converting it to xpm file and replacing x11tiles with it, nethack-x11 does not start. Also options "fullscreen, tile_width:32, tile_height:32" in /etc/nethackrc are necessary for bigger tiles.

• number_pad:1 option would be more reasonable for easy navigation since this is a gui package.

• pickup_types:$?!/="+ looks like a reasonable pickup default (https://nethackwiki.com/wiki/Autopickup)

• when i run nethack-x11 on my current / updated Manjaro laptop, I see messages at the top, map in the middle and status at the bottom as 3 rows. I think it would be much better if messages appear on the bottom right (next to status), and the map covers the mid and upper section of the screen. I tried align_message and align_status options but they did not work (https://nethackwiki.com/wiki/Options).

Thanks..

I have xorg-fonts-misc installed as I saw it as a possible solution on other sites.

Do you have xorg-fonts-misc installed? If that solves your issue I'll add it as a dependency.

The game is not starting:

```nethack

Warning: Cannot convert string "--fixed-medium----15-------*" to type FontStruct

Warning: Unable to load any usable ISO8859 font

Warning: Unable to load any usable ISO8859 font

Segmentation fault```

@teeahr1 what error message do you get when running as a normal user?

Have you tried running strace on it?

I can only launch the game as root. Anyone else having this problem?