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https://bz.apache.org/SpamAssassin/show_bug.cgi?id=8073
--- a/spamc/configure.in
+++ b/spamc/configure.in
@@ -48,7 +48,9 @@ dnl ----------------------------------------------------------------------
AC_CACHE_CHECK([for SHUT_RD],
shutrd, [
AC_TRY_COMPILE([#include <sys/types.h>
-#include <sys/socket.h>],
+#include <sys/socket.h>
+#include <stdio.h>
+],
[printf ("%d", SHUT_RD); return 0;],
[shutrd=yes],
[shutrd=no]),
@@ -89,7 +91,8 @@ dnl ----------------------------------------------------------------------
AC_CACHE_CHECK([for h_errno],
herrno, [
- AC_TRY_COMPILE([#include <netdb.h>],
+ AC_TRY_COMPILE([#include <netdb.h>
+#include <stdio.h>],
[printf ("%d", h_errno); return 0;],
[herrno=yes],
[herrno=no]),
diff --git a/spamc/configure b/spamc/configure
index d8e5dcf..2e30ba4 100755
--- a/spamc/configure
+++ b/spamc/configure
@@ -3555,6 +3555,7 @@ cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#include <sys/types.h>
#include <sys/socket.h>
+#include <stdio.h>
int
main ()
{
@@ -4253,6 +4254,7 @@ cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h. */
#include <netdb.h>
+#include <stdio.h>
int
main ()
{
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