diff --git a/configure.ac b/configure.ac
index 3619d8935e..b4b183f404 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1500,7 +1500,6 @@ if test x$CURL_DISABLE_LDAP != x1 ; then
 
   CURL_CHECK_HEADER_LBER
   CURL_CHECK_HEADER_LDAP
-  CURL_CHECK_HEADER_LDAPSSL
   CURL_CHECK_HEADER_LDAP_SSL
 
   if test -z "$LDAPLIBNAME" ; then
@@ -3202,9 +3201,6 @@ case "$OPT_FISH_FPATH" in
     ;;
 esac
 
-CURL_CHECK_HEADER_MALLOC
-CURL_CHECK_HEADER_MEMORY
-
 dnl Now check for the very most basic headers. Then we can use these
 dnl ones as default-headers when checking for the rest!
 AC_CHECK_HEADERS(
@@ -3409,10 +3405,8 @@ CURL_CHECK_FUNC_GETIFADDRS
 CURL_CHECK_FUNC_GMTIME_R
 CURL_CHECK_FUNC_INET_NTOP
 CURL_CHECK_FUNC_INET_PTON
-CURL_CHECK_FUNC_IOCTL
 CURL_CHECK_FUNC_IOCTLSOCKET
 CURL_CHECK_FUNC_IOCTLSOCKET_CAMEL
-CURL_CHECK_FUNC_LOCALTIME_R
 CURL_CHECK_FUNC_MEMRCHR
 CURL_CHECK_FUNC_POLL
 CURL_CHECK_FUNC_SIGACTION
@@ -3426,10 +3420,8 @@ CURL_CHECK_FUNC_STRCMPI
 CURL_CHECK_FUNC_STRDUP
 CURL_CHECK_FUNC_STRERROR_R
 CURL_CHECK_FUNC_STRICMP
-CURL_CHECK_FUNC_STRSTR
 CURL_CHECK_FUNC_STRTOK_R
 CURL_CHECK_FUNC_STRTOLL
-CURL_CHECK_FUNC_WRITEV
 
 case $host in
   *msdosdjgpp)