diff --git a/m4/curl-functions.m4 b/m4/curl-functions.m4
index 70307c82d..0dad50eed 100644
--- a/m4/curl-functions.m4
+++ b/m4/curl-functions.m4
@@ -217,10 +217,6 @@ AC_DEFUN([CURL_CHECK_FUNC_FDOPEN], [
     ],[
       AC_MSG_RESULT([no])
       tst_compi_fdopen="no"
-      dnl temporary debug tracing follows
-      echo " " >&6
-      sed 's/^/cc-fail> /' conftest.err >&6
-      echo " " >&6
     ])
   fi
   #
@@ -1611,10 +1607,6 @@ AC_DEFUN([CURL_CHECK_FUNC_STRTOK_R], [
     ],[
       AC_MSG_RESULT([no])
       tst_compi_strtok_r="no"
-      dnl temporary debug tracing follows
-      echo " " >&6
-      sed 's/^/cc-fail> /' conftest.err >&6
-      echo " " >&6
     ])
   fi
   #
@@ -1700,10 +1692,6 @@ AC_DEFUN([CURL_CHECK_FUNC_STRTOLL], [
     ],[
       AC_MSG_RESULT([no])
       tst_compi_strtoll="no"
-      dnl temporary debug tracing follows
-      echo " " >&6
-      sed 's/^/cc-fail> /' conftest.err >&6
-      echo " " >&6
     ])
   fi
   #