diff --git a/config/acx_pthread.m4 b/config/acx_pthread.m4
index a3d5faf392..5f9071056e 100644
--- a/config/acx_pthread.m4
+++ b/config/acx_pthread.m4
@@ -140,7 +140,7 @@ main ()
 }
 _ACEOF
             rm -f conftest.$ac_objext conftest$ac_exeext
-            if test "`(eval $ac_link 2>&1 >/dev/null)`" = ""; then
+            if test "`(eval $ac_link 2>&1 1>&5)`" = ""; then
                 # we continue with more flags because Linux needs -lpthread
                 # for libpq builds on PostgreSQL.  The test above only
                 # tests for building binaries, not shared libraries.
diff --git a/configure b/configure
index 73591c6b3c..50143de691 100755
--- a/configure
+++ b/configure
@@ -13336,7 +13336,7 @@ main ()
 }
 _ACEOF
             rm -f conftest.$ac_objext conftest$ac_exeext
-            if test "`(eval $ac_link 2>&1 >/dev/null)`" = ""; then
+            if test "`(eval $ac_link 2>&1 1>&5)`" = ""; then
                 # we continue with more flags because Linux needs -lpthread
                 # for libpq builds on PostgreSQL.  The test above only
                 # tests for building binaries, not shared libraries.