app-misc/screen: fix build w/ Clang 15 (fix configure tests)

Closes: https://bugs.gentoo.org/869371
Thanks-to: Nicholas Vinson <nvinson234@gmail.com>
Signed-off-by: Sam James <sam@gentoo.org>

2 files changed, 891 insertions, 0 deletions

diff --git a/app-misc/screen/files/screen-4.9.0-configure-implicit-function-decls.patch b/app-misc/screen/files/screen-4.9.0-configure-implicit-function-decls.patch
new file mode 100644
index 000000000000..e9db7ba786aa
--- /dev/null
+++ b/app-misc/screen/files/screen-4.9.0-configure-implicit-function-decls.patch
@@ -0,0 +1,745 @@
+https://bugs.gentoo.org/869371
+--- a/configure.ac
++++ b/configure.ac
+@@ -157,10 +157,11 @@ if test -n "$ULTRIX"; then
+ fi
+ AC_CHECKING(for POSIX.1)
+ AC_EGREP_CPP(YES_IS_DEFINED,
+ [#include <sys/types.h>
+ #include <unistd.h>
++int
+ main () {
+ #ifdef _POSIX_VERSION
+   YES_IS_DEFINED;
+ #endif
+ ], AC_NOTE(- you have a POSIX system) AC_DEFINE(POSIX) posix=1)
+@@ -231,10 +232,11 @@ dnl
+ 
+ AC_CHECKING(BSD job jontrol)
+ AC_TRY_LINK(
+ [#include <sys/types.h>
+ #include <sys/ioctl.h>
++#include <unistd.h>
+ ], [
+ #ifdef POSIX
+ tcsetpgrp(0, 0);
+ #else
+ int x = TIOCSPGRP;
+@@ -248,48 +250,64 @@ int y = TIOCNOTTY;
+ 
+ dnl
+ dnl    ****  setresuid(), setreuid(), seteuid()  ****
+ dnl
+ AC_CHECKING(setresuid)
+-AC_TRY_LINK(,[
++AC_TRY_LINK(
++[#include <unistd.h>
++], [
+ setresuid(0, 0, 0);
+ ], AC_DEFINE(HAVE_SETRESUID))
+ AC_CHECKING(setreuid)
+-AC_TRY_LINK(,[
++AC_TRY_LINK(
++[#include <unistd.h>
++], [
+ setreuid(0, 0);
+ ], AC_DEFINE(HAVE_SETREUID))
+ dnl
+ dnl seteuid() check:
+ dnl   linux seteuid was broken before V1.1.11
+ dnl   NeXT, AUX, ISC, and ultrix are still broken (no saved uid support)
+ dnl   Solaris seteuid doesn't change the saved uid, bad for
+ dnl     multiuser screen sessions
+ AC_CHECKING(seteuid)
+-AC_TRY_LINK(,[
++AC_TRY_LINK(
++[#include <unistd.h>
++],[
+ #if defined(linux) || defined(NeXT) || defined(_AUX_SOURCE) || defined(AUX) || defined(ultrix) || (defined(sun) && defined(SVR4)) || defined(ISC) || defined(sony_news)
+-seteuid_is_broken(0);
++int seteuid_is_broken(int); seteuid_is_broken(0);
+ #else
+ seteuid(0);
+ #endif
+ ], AC_DEFINE(HAVE_SETEUID))
+ 
+ dnl execvpe
+ AC_CHECKING(execvpe)
+-AC_TRY_LINK(,[
++AC_TRY_LINK(
++[#include <unistd.h>
++],[
+     execvpe(0, 0, 0);
+ ], AC_DEFINE(HAVE_EXECVPE)
+ CFLAGS="$CFLAGS -D_GNU_SOURCE")
+ 
+ dnl
+ dnl    ****  select()  ****
+ dnl
+ 
+ AC_CHECKING(select)
+-AC_TRY_LINK(,[select(0, 0, 0, 0, 0);],, 
++AC_TRY_LINK(
++[#include <sys/select.h>
++],[
++    select(0, 0, 0, 0, 0);
++],, 
+ LIBS="$LIBS -lnet -lnsl"
+ AC_CHECKING(select with $LIBS)
+-AC_TRY_LINK(,[select(0, 0, 0, 0, 0);],, 
++AC_TRY_LINK(
++[#include <sys/select.h>
++],[
++    select(0, 0, 0, 0, 0);
++],, 
+ AC_MSG_ERROR(!!! no select - no screen))
+ )
+ dnl
+ dnl    ****  FIFO tests  ****
+ dnl
+@@ -314,11 +332,11 @@ AC_TRY_RUN([
+ #define S_IFIFO 0010000
+ #endif
+ 
+ char *fin = "/tmp/conftest$$";
+ 
+-main()
++int main()
+ {
+   struct stat stb;
+   fd_set f;
+ 
+   (void)alarm(5);
+@@ -326,40 +344,40 @@ main()
+ #ifdef POSIX
+   if (mkfifo(fin, 0777))
+ #else
+   if (mknod(fin, S_IFIFO|0777, 0))
+ #endif
+-    exit(1);
++    return 1;
+   if (stat(fin, &stb) || (stb.st_mode & S_IFIFO) != S_IFIFO)
+-    exit(1);
++    return 1;
+   close(0);
+ #ifdef __386BSD__
+   /*
+    * The next test fails under 386BSD, but screen works using fifos.
+    * Fifos in O_RDWR mode are only used for the BROKEN_PIPE case and for
+    * the select() configuration test.
+    */
+-  exit(0);
++  return 0;
+ #endif
+   if (open(fin, O_RDONLY | O_NONBLOCK))
+-    exit(1);
++    return 1;
+   if (fork() == 0)
+     {
+       close(0);
+       if (open(fin, O_WRONLY | O_NONBLOCK))
+-	exit(1);
++        return 1;
+       close(0);
+       if (open(fin, O_WRONLY | O_NONBLOCK))
+-	exit(1);
++        return 1;
+       if (write(0, "TEST", 4) == -1)
+-	exit(1);
+-      exit(0);
++        return 1;
++      return 0;
+     }
+   FD_SET(0, &f);
+   if (select(1, &f, 0, 0, 0) == -1)
+-    exit(1);
+-  exit(0);
++    return 1;
++  return 0;
+ }
+ ], AC_NOTE(- your fifos are usable) fifo=1,
+ AC_NOTE(- your fifos are not usable),
+ AC_NOTE(- skipping check because we are cross compiling; assuming fifos are usable) fifo=1)
+ rm -f /tmp/conftest*
+@@ -385,30 +403,31 @@ AC_TRY_RUN([
+ #define S_IFIFO 0010000
+ #endif
+ 
+ char *fin = "/tmp/conftest$$";
+ 
++int
+ main()
+ {
+   struct timeval tv;
+   fd_set f;
+ 
+ #ifdef POSIX
+   if (mkfifo(fin, 0600))
+ #else
+   if (mknod(fin, S_IFIFO|0600, 0))
+ #endif
+-    exit(1);
++    return 1;
+   close(0);
+   if (open(fin, O_RDONLY|O_NONBLOCK))
+-    exit(1);
++    return 1;
+   FD_SET(0, &f);
+   tv.tv_sec = 1;
+   tv.tv_usec = 0;
+   if (select(1, &f, 0, 0, &tv))
+-    exit(1);
+-  exit(0);
++    return 1;
++  return 0;
+ }
+ ], AC_NOTE(- your implementation is ok), 
+ AC_NOTE(- you have a broken implementation) AC_DEFINE(BROKEN_PIPE) fifobr=1,
+ AC_NOTE(- skipping check because we are cross compiling; assuming fifo implementation is ok))
+ rm -f /tmp/conftest*
+@@ -432,46 +455,48 @@ AC_TRY_RUN([
+ 
+ #include <sys/stat.h>
+ #include <fcntl.h>
+ #include <sys/socket.h>
+ #include <sys/un.h>
++#include <signal.h>
+ 
+ char *son = "/tmp/conftest$$";
+ 
++int
+ main()
+ {
+   int s1, s2, l;
+   struct sockaddr_un a;
+   fd_set f;
+ 
+   (void)alarm(5);
+   if ((s1 = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
+-    exit(1);
++    return 1;
+   a.sun_family = AF_UNIX;
+   strcpy(a.sun_path, son);
+   (void) unlink(son);
+   if (bind(s1, (struct sockaddr *) &a, strlen(son)+2) == -1)
+-    exit(1);
++    return 1;
+   if (listen(s1, 2))
+-    exit(1);
++    return 1;
+   if (fork() == 0)
+     {
+       if ((s2 = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
+ 	kill(getppid(), 3);
+       (void)connect(s2, (struct sockaddr *)&a, strlen(son) + 2);
+       if (write(s2, "HELLO", 5) == -1)
+ 	kill(getppid(), 3);
+-      exit(0);
++      return 0;
+     }
+   l = sizeof(a);
+   close(0);
+   if (accept(s1, &a, &l))
+-    exit(1);
++    return 1;
+   FD_SET(0, &f);
+   if (select(1, &f, 0, 0, 0) == -1)
+-    exit(1);
+-  exit(0);
++    return 1;
++  return 0;
+ }
+ ], AC_NOTE(- your sockets are usable) sock=1,
+ AC_NOTE(- your sockets are not usable),
+ AC_NOTE(- skipping check because we are cross compiling; assuming sockets are usable) sock=1)
+ rm -f /tmp/conftest*
+@@ -491,26 +516,27 @@ AC_TRY_RUN([
+ #include <sys/socket.h>
+ #include <sys/un.h>
+ 
+ char *son = "/tmp/conftest$$";
+ 
++int
+ main()
+ {
+   int s;
+   struct stat stb;
+   struct sockaddr_un a;
+   if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
+-    exit(0);
++    return 0;
+   a.sun_family = AF_UNIX;
+   strcpy(a.sun_path, son);
+   (void) unlink(son);
+   if (bind(s, (struct sockaddr *) &a, strlen(son)+2) == -1)
+-    exit(0);
++    return 0;
+   if (stat(son, &stb))
+-    exit(1);
++    return 1;
+   close(s);
+-  exit(0);
++  return 0;
+ }
+ ],AC_NOTE(- you are normal),
+ AC_NOTE(- unix domain sockets are not kept in the filesystem)
+ AC_DEFINE(SOCK_NOT_IN_FS) socknofs=1,
+ AC_NOTE(- skipping check because we are cross compiling; assuming sockets are normal))
+@@ -545,122 +571,167 @@ char *nam = "/tmp/conftest$$";
+ #endif
+ #ifndef S_IFIFO
+ #define S_IFIFO 0010000
+ #endif
+ 
++int
+ main()
+ {
+   fd_set f;
+ 
+ #ifdef __FreeBSD__
+ /* From Andrew A. Chernov (ache@astral.msk.su):
+  * opening RDWR fifo fails in BSD 4.4, but select return values are
+  * right.
+  */
+-  exit(0);
++  return 0;
+ #endif
+   (void)alarm(5);
+ #ifdef POSIX
+   if (mkfifo(nam, 0777))
+ #else
+   if (mknod(nam, S_IFIFO|0777, 0))
+ #endif
+-    exit(1);
++    return 1;
+   close(0);
+   if (open(nam, O_RDWR | O_NONBLOCK))
+-    exit(1);
++    return 1;
+   if (write(0, "TEST", 4) == -1)
+-    exit(1);
++    return 1;
+ 
+ #else
+ 
+ #include <sys/types.h>
+ #include <sys/socket.h>
+ #include <sys/un.h>
++#include <signal.h>
+ 
++int
+ main()
+ {
+   int s1, s2, l;
+   struct sockaddr_un a;
+   fd_set f;
+ 
+   (void)alarm(5);
+   if ((s1 = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
+-    exit(1);
++    return 1;
+   a.sun_family = AF_UNIX;
+   strcpy(a.sun_path, nam);
+   (void) unlink(nam);
+   if (bind(s1, (struct sockaddr *) &a, strlen(nam)+2) == -1)
+-    exit(1);
++    return 1;
+   if (listen(s1, 2))
+-    exit(1);
++    return 1;
+   if (fork() == 0)
+     {
+       if ((s2 = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
+ 	kill(getppid(), 3);
+       (void)connect(s2, (struct sockaddr *)&a, strlen(nam) + 2);
+       if (write(s2, "HELLO", 5) == -1)
+ 	kill(getppid(), 3);
+-      exit(0);
++      return 0;
+     }
+   l = sizeof(a);
+   close(0);
+   if (accept(s1, (struct sockaddr *)&a, &l))
+-    exit(1);
++    return 1;
+ #endif
+ 
+ 
+   FD_SET(0, &f);
+   if (select(1, &f, 0, 0, 0) == -1)
+-    exit(1);
++    return 1;
+   if (select(1, &f, &f, 0, 0) != 2)
+-    exit(1);
+-  exit(0);
++    return 1;
++  return 0;
+ }
+ ],AC_NOTE(- select is ok),
+ AC_NOTE(- select can't count) AC_DEFINE(SELECT_BROKEN),
+ AC_NOTE(- skipping check because we are cross compiling; assuming select is ok))
+ 
+ dnl
+ dnl    ****  termcap or terminfo  ****
+ dnl
+ AC_CHECKING(for tgetent)
+-AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
++AC_TRY_LINK([
++    #include <curses.h>
++    #include <term.h>
++], [
++    tgetent((char *)0, (char *)0);
++],,
+ olibs="$LIBS"
+ LIBS="-lcurses $olibs"
+ AC_CHECKING(libcurses)
+-AC_TRY_LINK(,[
++AC_TRY_LINK([#include <curses.h>
++    #include <term.h>
++],[
+ #ifdef __hpux
+ __sorry_hpux_libcurses_is_totally_broken_in_10_10();
+ #else
+ tgetent((char *)0, (char *)0);
+ #endif
+ ],,
+ LIBS="-ltermcap $olibs"
+ AC_CHECKING(libtermcap)
+-AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
++AC_TRY_LINK(
++[#include <curses.h>
++    #include <term.h>
++],[
++    tgetent((char *)0, (char *)0);
++],,
+ LIBS="-ltermlib $olibs"
+ AC_CHECKING(libtermlib)
+-AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
++AC_TRY_LINK(
++[#include <curses.h>
++    #include <term.h>
++],[
++    tgetent((char *)0, (char *)0);
++],,
+ LIBS="-lncursesw $olibs"
+ AC_CHECKING(libncursesw)
+-AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
++AC_TRY_LINK(
++[#include <curses.h>
++    #include <term.h>
++],[
++    tgetent((char *)0, (char *)0);
++],,
+ LIBS="-ltinfow $olibs"
+ AC_CHECKING(libtinfow)
+-AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
++AC_TRY_LINK(
++[#include <curses.h>
++    #include <term.h>
++],[
++    tgetent((char *)0, (char *)0);
++],,
+ LIBS="-lncurses $olibs"
+ AC_CHECKING(libncurses)
+-AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
++AC_TRY_LINK(
++[#include <curses.h>
++    #include <term.h>
++],[
++    tgetent((char *)0, (char *)0);
++],,
+ LIBS="-ltinfo $olibs"
+ AC_CHECKING(libtinfo)
+-AC_TRY_LINK(,tgetent((char *)0, (char *)0);,,
++AC_TRY_LINK(
++[#include <curses.h>
++    #include <term.h>
++],[
++    tgetent((char *)0, (char *)0);
++],,
+ AC_MSG_ERROR(!!! no tgetent - no screen)))))))))
+ 
+ AC_TRY_RUN([
++#include <curses.h>
++#include <string.h>
++#include <term.h>
++
++int
+ main()
+ {
+- exit(strcmp(tgoto("%p1%d", 0, 1), "1") ? 0 : 1);
++ return(strcmp(tgoto("%p1%d", 0, 1), "1") ? 0 : 1);
+ }], AC_NOTE(- you use the termcap database),
+ AC_NOTE(- you use the terminfo database) AC_DEFINE(TERMINFO),
+ AC_NOTE(- skipping check because we are cross compiling; assuming terminfo database is used) AC_DEFINE(TERMINFO))
+ AC_CHECKING(ospeed)
+ AC_TRY_LINK(extern short ospeed;,ospeed=5;,,AC_DEFINE(NEED_OSPEED))
+@@ -677,11 +748,15 @@ fi
+ 
+ if test "$cross_compiling" = no ; then
+ AC_CHECKING(for SVR4 ptys)
+ sysvr4ptys=
+ if test -c /dev/ptmx ; then
+-AC_TRY_LINK([],[ptsname(0);grantpt(0);unlockpt(0);],[AC_DEFINE(HAVE_SVR4_PTYS)
++AC_TRY_LINK([
++    #include <stdlib.h>
++], [
++    ptsname(0);grantpt(0);unlockpt(0);
++],[AC_DEFINE(HAVE_SVR4_PTYS)
+ sysvr4ptys=1])
+ fi
+ fi
+ 
+ AC_CHECK_FUNCS(getpt)
+@@ -733,33 +808,36 @@ AC_CHECKING(default tty permissions/group)
+ rm -f conftest_grp
+ AC_TRY_RUN([
+ #include <sys/types.h>
+ #include <sys/stat.h>
+ #include <stdio.h>
++#include <stdlib.h>
++#include <unistd.h>
++int
+ main()
+ {
+   struct stat sb;
+   char *x,*ttyname();
+   int om, m;
+   FILE *fp;
+ 
+-  if (!(x = ttyname(0))) exit(1);
+-  if (stat(x, &sb)) exit(1);
++  if (!(x = ttyname(0))) return 1;
++  if (stat(x, &sb)) return 1;
+   om = sb.st_mode;
+-  if (om & 002) exit(0);
++  if (om & 002) return 0;
+   m = system("mesg y");
+-  if (m == -1 || m == 127) exit(1);
+-  if (stat(x, &sb)) exit(1);
++  if (m == -1 || m == 127) return 1;
++  if (stat(x, &sb)) return 1;
+   m = sb.st_mode;
+-  if (chmod(x, om)) exit(1);
+-  if (m & 002) exit(0);
+-  if (sb.st_gid == getgid()) exit(1);
++  if (chmod(x, om)) return 1;
++  if (m & 002) return 0;
++  if (sb.st_gid == getgid()) return 1;
+   if (!(fp=fopen("conftest_grp", "w")))
+-    exit(1);
++    return 1;
+   fprintf(fp, "%d\n", sb.st_gid);
+   fclose(fp);
+-  exit(0);
++  return 0;
+ }
+ ],[
+     if test -f conftest_grp; then
+ 	ptygrp=`cat conftest_grp`
+ 	AC_NOTE([- pty mode: $ptymode, group: $ptygrp])
+@@ -869,17 +942,25 @@ AC_CHECKING(for libutil(s))
+ test -f /usr/lib/libutils.a && LIBS="$LIBS -lutils"
+ test -f /usr/lib/libutil.a && LIBS="$LIBS -lutil"
+ fi
+ 
+ AC_CHECKING(getloadavg)
+-AC_TRY_LINK(,[getloadavg((double *)0, 0);],
++AC_TRY_LINK(
++[
++    #include <stdlib.h>
++],[
++    getloadavg((double *)0, 0);],
+ AC_DEFINE(LOADAV_GETLOADAVG) load=1,
+ if test "$cross_compiling" = no && test -f /usr/lib/libkvm.a ; then
+ olibs="$LIBS"
+ LIBS="$LIBS -lkvm"
+ AC_CHECKING(getloadavg with -lkvm)
+-AC_TRY_LINK(,[getloadavg((double *)0, 0);],
++AC_TRY_LINK(
++[
++    #include <stdlib.h>
++],[
++    getloadavg((double *)0, 0);],
+ AC_DEFINE(LOADAV_GETLOADAVG) load=1, LIBS="$olibs")
+ fi
+ )
+ 
+ if test -z "$load" ; then
+@@ -931,10 +1012,11 @@ else
+ 
+ $nlist64
+ 
+ struct nlist nl[2];
+ 
++int
+ main()
+ {
+ #if !defined(_AUX_SOURCE) && !defined(AUX)
+ # ifdef NLIST_NAME_UNION
+   nl[0].n_un.n_name = "$av";
+@@ -944,12 +1026,12 @@ main()
+ #else
+   strncpy(nl[0].n_name, "$av", sizeof(nl[0].n_name));
+ #endif
+   nlist(LOADAV_UNIX, nl);
+   if (nl[0].n_value == 0)
+-    exit(1);
+-  exit(0);
++    return 1;
++  return 0;
+ }
+   ],avensym=$av;break)
+   if test "$av" = _Loadavg; then
+     nlist64='#define nlist nlist64'
+   fi
+@@ -1068,21 +1150,22 @@ void
+ hand()
+ {
+   got++;
+ }
+ 
++int
+ main()
+ {
+   /* on hpux we use sigvec to get bsd signals */
+ #ifdef __hpux
+   (void)signal(SIGCLD, hand);
+   kill(getpid(), SIGCLD);
+   kill(getpid(), SIGCLD);
+   if (got < 2)
+-    exit(1);
++    return 1;
+ #endif
+-  exit(0);
++  return 0;
+ }
+ ],,AC_DEFINE(SYSVSIGS),:)
+ 
+ fi
+ 
+@@ -1107,14 +1190,22 @@ oldlibs="$LIBS"
+ LIBS="$LIBS -lsun"
+ AC_CHECKING(IRIX sun library)
+ AC_TRY_LINK(,,,LIBS="$oldlibs")
+ 
+ AC_CHECKING(syslog)
+-AC_TRY_LINK(,[closelog();], , [oldlibs="$LIBS"
++AC_TRY_LINK(
++[#include <syslog.h>
++], [
++    closelog();
++], , [oldlibs="$LIBS"
+ LIBS="$LIBS -lbsd"
+ AC_CHECKING(syslog in libbsd.a)
+-AC_TRY_LINK(, [closelog();], AC_NOTE(- found.), [LIBS="$oldlibs"
++AC_TRY_LINK(
++[#include <syslog.h>
++], [
++    closelog();
++], AC_NOTE(- found.), [LIBS="$oldlibs"
+ AC_NOTE(- bad news: syslog missing.) AC_DEFINE(NOSYSLOG)])])
+ 
+ AC_EGREP_CPP(YES_IS_DEFINED,
+ [#ifdef M_UNIX
+    YES_IS_DEFINED;
+@@ -1147,66 +1238,87 @@ fi
+ dnl AC_CHECK_HEADER(shadow.h, AC_DEFINE(SHADOWPW))
+ AC_CHECKING(getspnam)
+ AC_TRY_LINK([#include <shadow.h>], [getspnam("x");],AC_DEFINE(SHADOWPW))
+ 
+ AC_CHECKING(getttyent)
+-AC_TRY_LINK(,[getttyent();], AC_DEFINE(GETTTYENT))
++AC_TRY_LINK(
++[
++    #include <ttyent.h>
++],[
++    getttyent();
++], AC_DEFINE(GETTTYENT))
+ 
+ AC_CHECKING(fdwalk)
+ AC_TRY_LINK([#include <stdlib.h>], [fdwalk(NULL, NULL);],AC_DEFINE(HAVE_FDWALK))
+ 
+ AC_CHECKING(whether memcpy/memmove/bcopy handles overlapping arguments)
+ AC_TRY_RUN([
++#include <string.h>
++
++int
+ main() {
+   char buf[10];
+   strcpy(buf, "abcdefghi");
+   bcopy(buf, buf + 2, 3);
+   if (strncmp(buf, "ababcf", 6))
+-    exit(1);
++    return 1;
+   strcpy(buf, "abcdefghi");
+   bcopy(buf + 2, buf, 3);
+   if (strncmp(buf, "cdedef", 6))
+-    exit(1);
+-  exit(0); /* libc version works properly.  */
++    return 1;
++  return 0; /* libc version works properly.  */
+ }], AC_DEFINE(USEBCOPY),,:)
+ 
+ AC_TRY_RUN([
++#include <string.h>
++
+ #define bcopy(s,d,l) memmove(d,s,l)
++int
+ main() {
+   char buf[10];
+   strcpy(buf, "abcdefghi");
+   bcopy(buf, buf + 2, 3);
+   if (strncmp(buf, "ababcf", 6))
+-    exit(1);
++    return 1;
+   strcpy(buf, "abcdefghi");
+   bcopy(buf + 2, buf, 3);
+   if (strncmp(buf, "cdedef", 6))
+-    exit(1);
+-  exit(0); /* libc version works properly.  */
++    return 1;
++  return 0; /* libc version works properly.  */
+ }], AC_DEFINE(USEMEMMOVE),,
+   AC_NOTE(- skipping check because we are cross compiling; use memmove) AC_DEFINE(USEMEMMOVE))
+ 
+ 
+ AC_TRY_RUN([
++#include <string.h>
++
+ #define bcopy(s,d,l) memcpy(d,s,l)
++int
+ main() {
+   char buf[10];
+   strcpy(buf, "abcdefghi");
+   bcopy(buf, buf + 2, 3);
+   if (strncmp(buf, "ababcf", 6))
+-    exit(1);
++    return 1;
+   strcpy(buf, "abcdefghi");
+   bcopy(buf + 2, buf, 3);
+   if (strncmp(buf, "cdedef", 6))
+-    exit(1);
+-  exit(0); /* libc version works properly.  */
++    return 1;
++  return 0; /* libc version works properly.  */
+ }], AC_DEFINE(USEMEMCPY),,:)
+ 
+ AC_SYS_LONG_FILE_NAMES
+ 
+ AC_MSG_CHECKING(for vsprintf)
+-AC_TRY_LINK([#include <stdarg.h>],[va_list valist; vsprintf(0,0,valist);], AC_MSG_RESULT(yes);AC_DEFINE(USEVARARGS), AC_MSG_RESULT(no))
++AC_TRY_LINK(
++[
++    #include <stdarg.h>
++    #include <stdio.h>
++],
++[
++    va_list valist; vsprintf(0,0,valist);
++], AC_MSG_RESULT(yes);AC_DEFINE(USEVARARGS), AC_MSG_RESULT(no))
+ 
+ AC_HEADER_DIRENT
+ 
+ AC_MSG_CHECKING(for setenv)
+ if test -z "$ac_setenv_args"; then
+
diff --git a/app-misc/screen/screen-4.9.0-r1.ebuild b/app-misc/screen/screen-4.9.0-r1.ebuild
new file mode 100644
index 000000000000..44eb81d05d0d
--- /dev/null
+++ b/app-misc/screen/screen-4.9.0-r1.ebuild
@@ -0,0 +1,146 @@
+# Copyright 1999-2022 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit autotools flag-o-matic pam tmpfiles
+
+DESCRIPTION="screen manager with VT100/ANSI terminal emulation"
+HOMEPAGE="https://www.gnu.org/software/screen/"
+
+if [[ ${PV} != 9999 ]] ; then
+	SRC_URI="mirror://gnu/${PN}/${P}.tar.gz"
+	KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86 ~amd64-linux ~x86-linux ~ppc-macos ~x64-macos ~sparc-solaris ~sparc64-solaris ~x64-solaris ~x86-solaris"
+else
+	inherit git-r3
+	EGIT_REPO_URI="https://git.savannah.gnu.org/git/screen.git"
+	EGIT_CHECKOUT_DIR="${WORKDIR}/${P}" # needed for setting S later on
+	S="${WORKDIR}"/${P}/src
+fi
+
+LICENSE="GPL-2"
+SLOT="0"
+IUSE="debug nethack pam selinux multiuser"
+
+DEPEND=">=sys-libs/ncurses-5.2:=
+	virtual/libcrypt:=
+	pam? ( sys-libs/pam )"
+RDEPEND="${DEPEND}
+	acct-group/utmp
+	selinux? ( sec-policy/selinux-screen )"
+BDEPEND="sys-apps/texinfo"
+
+PATCHES=(
+	# Don't use utempter even if it is found on the system.
+	"${FILESDIR}"/${PN}-4.3.0-no-utempter.patch
+	"${FILESDIR}"/${PN}-4.6.2-utmp-exit.patch
+	"${FILESDIR}"/${PN}-4.9.0-configure-implicit-function-decls.patch
+)
+
+src_prepare() {
+	default
+
+	# sched.h is a system header and causes problems with some C libraries
+	mv sched.h _sched.h || die
+	sed -i '/include/ s:sched.h:_sched.h:' screen.h || die
+
+	# Fix manpage
+	sed -i \
+		-e "s:/usr/local/etc/screenrc:${EPREFIX}/etc/screenrc:g" \
+		-e "s:/usr/local/screens:${EPREFIX}/tmp/screen:g" \
+		-e "s:/local/etc/screenrc:${EPREFIX}/etc/screenrc:g" \
+		-e "s:/etc/utmp:${EPREFIX}/var/run/utmp:g" \
+		-e "s:/local/screens/S\\\-:${EPREFIX}/tmp/screen/S\\\-:g" \
+		doc/screen.1 || die
+
+	if [[ ${CHOST} == *-darwin* ]] || use elibc_musl; then
+		sed -i -e '/^#define UTMPOK/s/define/undef/' acconfig.h || die
+	fi
+
+	# disable musl dummy headers for utmp[x]
+	use elibc_musl && append-cppflags "-D_UTMP_H -D_UTMPX_H"
+
+	# reconfigure
+	eautoreconf
+}
+
+src_configure() {
+	append-cppflags "-DMAXWIN=${MAX_SCREEN_WINDOWS:-100}"
+
+	if [[ ${CHOST} == *-solaris* ]]; then
+		# enable msg_header by upping the feature standard compatible
+		# with c99 mode
+		append-cppflags -D_XOPEN_SOURCE=600
+	fi
+
+	use nethack || append-cppflags "-DNONETHACK"
+	use debug && append-cppflags "-DDEBUG"
+
+	local myeconfargs=(
+		--with-socket-dir="${EPREFIX}/tmp/${PN}"
+		--with-sys-screenrc="${EPREFIX}/etc/screenrc"
+		--with-pty-mode=0620
+		--with-pty-group=5
+		--enable-rxvt_osc
+		--enable-telnet
+		--enable-colors256
+		$(use_enable pam)
+	)
+	econf "${myeconfargs[@]}"
+}
+
+src_compile() {
+	LC_ALL=POSIX emake comm.h term.h
+	emake osdef.h
+
+	emake -C doc screen.info
+	default
+}
+
+src_install() {
+	local DOCS=(
+		README ChangeLog INSTALL TODO NEWS* patchlevel.h
+		doc/{FAQ,README.DOTSCREEN,fdpat.ps,window_to_display.ps}
+	)
+
+	emake DESTDIR="${D}" SCREEN="${P}" install
+
+	local tmpfiles_perms tmpfiles_group
+
+	if use multiuser || use prefix ; then
+		fperms 4755 /usr/bin/${P}
+		tmpfiles_perms="0755"
+		tmpfiles_group="root"
+	else
+		fowners root:utmp /usr/bin/${P}
+		fperms 2755 /usr/bin/${P}
+		tmpfiles_perms="0775"
+		tmpfiles_group="utmp"
+	fi
+
+	newtmpfiles - screen.conf <<<"d /tmp/screen ${tmpfiles_perms} root ${tmpfiles_group}"
+
+	insinto /usr/share/${PN}
+	doins terminfo/{screencap,screeninfo.src}
+
+	insinto /etc
+	doins "${FILESDIR}"/screenrc
+
+	if use pam; then
+		pamd_mimic_system screen auth
+	fi
+
+	dodoc "${DOCS[@]}"
+}
+
+pkg_postinst() {
+	if [[ -z ${REPLACING_VERSIONS} ]]; then
+		elog "Some dangerous key bindings have been removed or changed to more safe values."
+		elog "We enable some xterm hacks in our default screenrc, which might break some"
+		elog "applications. Please check /etc/screenrc for information on these changes."
+	fi
+
+	tmpfiles_process screen.conf
+
+	ewarn "This revision changes the screen socket location to ${EROOT}/tmp/${PN}"
+}