Goal: recompile http://ftp.gnu.org/gnu/chess= /gnuchess-6.2.8.tar.gz in Linux for FreeDOS project.

Subgoal:

Compile the following program taken from:= https://man7.org/linux/man-pages/man3/pthread_sigmask.3.ht= ml

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

//#include <pthread.h>

#include <pth.h>

<= div> #include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <signal.h>
=

#include <errno.h>

/* Simple e= rror handling functions */

&= nbsp; #define handle_error_en(en, msg) \

&n= bsp; = ; do { errno =3D en; perror(msg); exit(EXIT_FAILURE); } while (0)

static void *
<= /div>

sig_thread(void *arg)

{

&n= bsp; sigset_t *set =3D arg;

int s= , sig;

&nb= sp; for (;;) {

&nbs= p; s =3D sigwait(set,= &sig);

&= nbsp; if (s !=3D 0)

= ; &n= bsp; handle_error_en(s, "sigwait");

&= nbsp; &nbs= p; printf("Signal handling thread got signal %d\n", sig);

&nb= sp; }

&= nbsp; }

&n= bsp; int

&nbs= p; main(int argc, char *argv[])

= ; {

&nb= sp; pthread_t thread;

&nb= sp; sigset_t set;https://github.com/jwt27/build-gcc=

= int s;

&n= bsp; /* Block SIGQUIT and SIGUSR1; other threads created = by main()

&nb= sp; will inherit a copy of the signal mask. */
<= /div>

&n= bsp; sigemptyset(&set);

&nb= sp; sigaddset(&set, SIGQUIT);

sigaddset(&= amp;set, SIGUSR1);

= s =3D pthread_sigmask(SIG_BLOCK, &set, NULL);

if (s = !=3D 0)

= ; handle_error_en(s, "pthread_sigmask");
<= /div>

&n= bsp; s =3D pthread_create(&thread, NULL, &sig_thread, &se= t);

&nb= sp; if (s !=3D 0)

&= nbsp; handle_error_en(s, "pthread_creat= e");

= ; /* Main thread carries on to create other threads and/o= r do

&n= bsp; other work. */

&n= bsp; pause(); &n= bsp; /* Dummy pause so we c= an test program */

}
=

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

I changed = #include <pthread.h> to <pth.h>

I might still be = confused between pthread.h and pth.h.

I use: <= a target=3D"_blank" href=3D"https://github.com/jwt27/build-gcc">https://git= hub.com/jwt27/build-gcc with PREFIX=3D/home/paul/opt/cross

I have unzip http://www.delorie.com/pub/djgp= p/current/v2gnu/pth207b.zip in a temporary dir

I have copied: /pth/lib/ into /home/paul/opt/cross/i386-pc-msdosdjgpp/= lib/

adjusting lastl line of .la files to that directory.
=

I have copied pth.h and pthread.h to: /home/paul/= opt/cross/i386-pc-msdosdjgpp/sys-include/

Whil= e trying to compile subgoal program: I just commented out #include line not= working in pth.h...

except for sys/select: I finished to dow= nload it from: https://code.woboq.org/qt5/include/sys/select.h.html=

paul AT kasparno:~/sigset$ i386-pc-msdosdjgp= p-gcc sigset.c -lpthread -lpth

In file included from sigset.c= :2:

/home/paul/opt/cross/i386-pc-msdosdjgpp/sys-include/pth.h= :43:10: fatal error: sys/wtime.h: No such file or directory

&= nbsp; 43 | #include <sys/wtime.h> /* fo= r struct timespec */

| &n= bsp; ^~~~~~~~~~~~~

= compilation terminated.

paul AT kasparno:~/sigset$ i386-pc-msdos= djgpp-gcc sigset.c -lpthread -lpth

In file included from sigs= et.c:2:

/home/paul/opt/cross/i386-pc-msdosdjgpp/sys-include/p= th.h:45:10: fatal error: sys/socket.h: No such file or directory

<= div> 45 | #include <sys/socket.h> /* fo= r sockaddr */

= ; | = ^~~~~~~~~~~~~~

compilation terminated.

p= aul AT kasparno:~/sigset$ i386-pc-msdosdjgpp-gcc sigset.c -lpthread -lpth
<= /div>

In file included from /home/paul/opt/cross/i386-pc-msdosdjgpp/sys= -include/pth.h:47,

= from sigset.c:2:
=

/home/paul/opt/cross/i386-pc-msdosdjgpp/sys-include/sys/select.h= :21:10: fatal error: features.h: No such file or directory

&n= bsp; 21 | #include <features.h>

= ; | ^~~~~= ~~~~~~~

compilation terminated.

paul AT kasparno:~= /sigset$

So, the sys/select.h (that I put in = /home/paul/opt/cross/i386-pc-msdosdjgpp/sys-include/sys/ ).

<= br>

That's where I am at for now... asking here for help.

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