scsh: fix the build against `gcc-14` (#402657)

https://github.com/scheme/scsh/pull/50.patch

From edced224436fa70cd7d885fe65996b9c3cfd33d7 Mon Sep 17 00:00:00 2001

From: Sergei Trofimovich <slyich@gmail.com>

Date: Mon, 28 Apr 2025 22:40:31 +0100

Subject: [PATCH] c/syscalls.c: add missing `<time.h>` icnlude

Without the change the build fails for me as:

    c/syscalls.c: In function 'sleep_until':

    c/syscalls.c:711:18: error: implicit declaration of function 'time' [-Wimplicit-function-declaration]

      711 |     time_t now = time(0);

          |                  ^~~~

    c/syscalls.c:41:1: note: 'time' is defined in header '<time.h>'; this is probably fixable by adding '#include <time.h>'

       40 | #include "syscalls.h"

      +++ |+#include <time.h>

       41 |

---

 c/syscalls.c | 1 +

 1 file changed, 1 insertion(+)

diff --git a/c/syscalls.c b/c/syscalls.c

index fe11e81..2be25a8 100644

--- a/c/syscalls.c

+++ b/c/syscalls.c

@@ -5,6 +5,7 @@

 #include <stdio.h>

 #include <stdlib.h>

+#include <time.h> /* for time() */

 #include <sys/signal.h>

 #include <signal.h>

 #include <sys/types.h>

https://github.com/scheme/scsh/pull/51.patch

From b2934abb68d6adab448f24787192c047e46cf17c Mon Sep 17 00:00:00 2001

From: Sergei Trofimovich <slyich@gmail.com>

Date: Mon, 28 Apr 2025 22:39:55 +0100

Subject: [PATCH] configure.ac: add detection of `pty.h`

Without the change the build on modern autoconf fails as:

    c/tty.c: In function 'allocate_master':

    c/tty.c:398:14: error: implicit declaration of function 'openpty'; did you mean 'openat'? [-Wimplicit-function-declaration]

      398 |         rc = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);

          |              ^~~~~~~

          |              openat

---

 configure.ac | 2 +-

 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac

index 99779dc..1cd8b22 100644

--- a/configure.ac

+++ b/configure.ac

@@ -32,7 +32,7 @@ CPPFLAGS="$CPPFLAGS -I$S48DIR/include"

 # Checks for libraries.

 # Checks for header files.

-AC_CHECK_HEADERS([fcntl.h limits.h netdb.h sgtty.h stdlib.h string.h sys/ioctl.h sys/param.h sys/time.h termios.h unistd.h utime.h])

+AC_CHECK_HEADERS([fcntl.h limits.h netdb.h pty.h sgtty.h stdlib.h string.h sys/ioctl.h sys/param.h sys/time.h termios.h unistd.h utime.h])

 dnl  We need the scheme48.h headers, so bomb out if we can't find them.

 AC_CHECK_HEADERS([scheme48.h], [],

    fetchSubmodules = true;

  };

  patches = [

    # Fix the build against gcc-14:

    # https://github.com/scheme/scsh/pull/50

    ./gcc-14-p1.patch

    # Fix the build against gcc-14:

    # https://github.com/scheme/scsh/pull/51

    ./gcc-14-p2.patch

  ];

  nativeBuildInputs = [ autoreconfHook ];

  buildInputs = [ scheme48 ];

  configureFlags = [ "--with-scheme48=${scheme48}" ];