+AC_CACHE_CHECK([whether the C++ compiler works], [avahi_cv_sys_cxx_works], [
+ AC_LANG_PUSH([C++])
+ AC_COMPILE_IFELSE([int main() { return 0; }], [avahi_cv_sys_cxx_works=yes],
+ [avahi_cv_sys_cxx_works=no])
+ AC_LANG_POP([C++])
+ ])
+[ if [ "x$avahi_cv_sys_cxx_works" = "xno" ]; then ]
+ AC_MSG_FAILURE([The C++ compiler does not work])
+[ fi ]
+
+ACX_PTHREAD(,AC_MSG_ERROR([Missing POSIX Threads support]))
+
+#
+# Check for netlink.h
+#
+AC_CHECK_HEADER(linux/netlink.h,
+HAVE_NETLINK=yes
+AC_DEFINE([HAVE_NETLINK],[],[Support for Linux netlink])
+, [], [
+#include <sys/socket.h>
+#include <asm/types.h>
+])
+
+AM_CONDITIONAL(HAVE_NETLINK, [ test x"$HAVE_NETLINK" = xyes ])
+
+#
+# Check for net/route.h
+#
+AC_CHECK_HEADER(net/route.h,
+HAVE_PF_ROUTE=yes
+AC_DEFINE([HAVE_PF_ROUTE],[],[Support for PF_ROUTE])
+, [], [
+#include <sys/types.h>
+#include <sys/socket.h>
+])
+
+AM_CONDITIONAL(HAVE_PF_ROUTE, [ test x"$HAVE_PF_ROUTE" = xyes ])
+
+#
+# Check for sys/filio.h; needed for FIONREAD on Solaris
+#
+AC_CHECK_HEADER(sys/filio.h,
+HAVE_SYS_FILIO_H=yes
+AC_DEFINE([HAVE_SYS_FILIO_H],[],[Support for sys/filio.h])
+, [], [
+])
+
+AM_CONDITIONAL(HAVE_SYS_FILIO_H, [ test x"$HAVE_SYS_FILIO_H" = xyes ])
+
+#
+# Check for sys/sysctl.h; not present on Solaris
+#
+AC_CHECK_HEADER(sys/sysctl.h,
+HAVE_SYS_SYSCTL=yes
+AC_DEFINE([HAVE_SYS_SYSCTL_H],[],[Support for sys/sysctl.h])
+, [], [
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/param.h>
+])
+
+AM_CONDITIONAL(HAVE_SYS_SYSCTL_H, [ test x"$HAVE_SYS_SYSCTL_H" = xyes ])
+
+#
+# Check for lifconf struct; only present on Solaris
+#
+AC_MSG_CHECKING(for struct lifconf)
+AC_CACHE_VAL(avahi_cv_has_struct_lifconf,
+[AC_TRY_COMPILE(
+[#include <sys/socket.h>
+#include <net/if.h>
+],[sizeof (struct lifconf);],
+avahi_cv_has_struct_lifconf=yes,avahi_cv_has_struct_lifconf=no)])
+AC_MSG_RESULT($avahi_cv_has_struct_lifconf)
+if test $avahi_cv_has_struct_lifconf = yes; then
+ AC_DEFINE(HAVE_STRUCT_LIFCONF,1,[Define if there is a struct lifconf.])
+fi
+