[PATCH] xdm: add definition for libbsd headers

[Alive 4ever]

Add HAVE_BSD_UNISTD_H and HAVE_BSD_STDLIB_H definition to include
'bsd/unistd.h' and 'bsd/stdlib.h' headers.

This fixes gcc 6.1.1 and clang 3.8.0 implicit function declaration error
(setproctitle and arc4random) on Linux system with 'libbsd' headers under
'bsd' include directory.

Signed-off-by: Alif M. Ahmad <alive4ever at live.com>
---
 configure.ac  | 4 ++++
 xdm/choose.c  | 4 ++++
 xdm/genauth.c | 4 ++++
 xdm/session.c | 4 ++++
 4 files changed, 16 insertions(+)

diff --git a/configure.ac b/configure.ac
index 2cd2817..3fc1da9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -68,12 +68,16 @@ AC_SEARCH_LIBS([getspnam], [sec gen shadow])
 
 # Function setproctitle() is in BSD -lutil or GNU systems -lbsd but N/A on Solaris
 AC_SEARCH_LIBS([setproctitle], [util bsd])
+AC_CHECK_HEADER([bsd/unistd.h],
+	[AC_DEFINE(HAVE_BSD_UNISTD_H,1,[Define to 1 if you have 'bsd/unistd.h' header])])
 
 # Function setusercontext() is in BSD -lutil but N/A on Solaris or GNU systems
 AC_SEARCH_LIBS([setusercontext], [util])
 
 # Function arc4random() is in BSD standard C or GNU systems -lbsd
 AC_SEARCH_LIBS([arc4random], [bsd], [HAVE_ARC4RANDOM="yes"])
+AC_CHECK_HEADER([bsd/stdlib.h],
+	[AC_DEFINE(HAVE_BSD_STDLIB_H,1,[Define to 1 if you have 'bsd/stdlib.h' header])])
 AC_SUBST(HAVE_ARC4RANDOM)
 AM_CONDITIONAL(HAVE_ARC4RANDOM, test x$HAVE_ARC4RANDOM = xyes)
 
diff --git a/xdm/choose.c b/xdm/choose.c
index f7472f5..16d9071 100644
--- a/xdm/choose.c
+++ b/xdm/choose.c
@@ -35,6 +35,10 @@ in this Software without prior written authorization from The Open Group.
 #include "dm.h"
 #include "dm_error.h"
 
+#ifdef HAVE_BSD_UNISTD_H
+#include <bsd/unistd.h>
+#endif
+
 #ifdef XDMCP
 
 # include <X11/X.h>
diff --git a/xdm/genauth.c b/xdm/genauth.c
index f50be3b..b99cdc0 100644
--- a/xdm/genauth.c
+++ b/xdm/genauth.c
@@ -43,6 +43,10 @@ from The Open Group.
 #include <time.h>
 #define Time_t time_t
 
+#ifdef HAVE_BSD_STDLIB_H
+#include <bsd/stdlib.h>
+#endif
+
 #ifdef HASXDMAUTH
 static unsigned char	key[8];
 #endif
diff --git a/xdm/session.c b/xdm/session.c
index 4f71d71..b20ceec 100644
--- a/xdm/session.c
+++ b/xdm/session.c
@@ -37,6 +37,10 @@ from The Open Group.
 # include "config.h"
 #endif
 
+#ifdef HAVE_BSD_UNISTD_H
+#include <bsd/unistd.h>
+#endif
+
 #include "dm.h"
 #include "dm_auth.h"
 #include "dm_error.h"
-- 
2.9.0