inet_* checks used NULL as a parameter, which was not necessarily defined

configure

 #! /bin/sh
 
-# From configure.in Revision: 1.119 
+# From configure.in Revision: 1.120 
 
 
 
@@ -3444,7 +3444,7 @@ cat > conftest.$ac_ext <<EOF
 #include <netinet/in.h>
 #include <arpa/inet.h>
 int main() {
-inet_ntop(0, NULL, NULL, 0); return (0);
+inet_ntop(0, 0, 0, 0); return (0);
 ; return 0; }
 EOF
 if { (eval echo configure:3451: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
@@ -3471,7 +3471,7 @@ cat > conftest.$ac_ext <<EOF
 #include <netinet/in.h>
 #include <arpa/inet.h>
 int main() {
-inet_pton(0, NULL, NULL); return (0);
+inet_pton(0, 0, 0); return (0);
 ; return 0; }
 EOF
 if { (eval echo configure:3478: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
@@ -3498,7 +3498,7 @@ cat > conftest.$ac_ext <<EOF
 #include <netinet/in.h>
 #include <arpa/inet.h>
 int main() {
-struct in_addr in; inet_aton(NULL, &in); return (0);
+struct in_addr in; inet_aton(0, &in); return (0);
 ; return 0; }
 EOF
 if { (eval echo configure:3505: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then

configure.in

@@ -13,7 +13,7 @@ dnl PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 dnl ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 dnl SOFTWARE.
 
-AC_REVISION($Revision: 1.119 $)
+AC_REVISION($Revision: 1.120 $)
 
 AC_PREREQ(2.13)
 
@@ -699,7 +699,7 @@ AC_TRY_LINK([
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>],
-        [inet_ntop(0, NULL, NULL, 0); return (0);],
+        [inet_ntop(0, 0, 0, 0); return (0);],
         [AC_MSG_RESULT(yes)
         ISC_PLATFORM_NEEDNTOP="#undef ISC_PLATFORM_NEEDNTOP"],
 
@@ -712,7 +712,7 @@ AC_TRY_LINK([
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>],
-        [inet_pton(0, NULL, NULL); return (0);],
+        [inet_pton(0, 0, 0); return (0);],
         [AC_MSG_RESULT(yes)
         ISC_PLATFORM_NEEDPTON="#undef ISC_PLATFORM_NEEDPTON"],
 
@@ -725,7 +725,7 @@ AC_TRY_LINK([
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>],
-        [struct in_addr in; inet_aton(NULL, &in); return (0);],
+        [struct in_addr in; inet_aton(0, &in); return (0);],
         [AC_MSG_RESULT(yes)
         ISC_PLATFORM_NEEDATON="#undef ISC_PLATFORM_NEEDATON"],