diff --git a/configure.ac b/configure.ac
index 761160d1a..5edbb6ca6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1111,6 +1111,7 @@ case "$LIBIDN" in
 
        if test "x$idn" = "xyes"; then
          curl_idn_msg="enabled"
+         AC_SUBST(IDN_ENABLED, [1])
          dnl different versions of libidn have different setups of these:
          AC_CHECK_FUNCS( idn_free idna_strerror tld_strerror)
          AC_CHECK_HEADERS( idn-free.h tld.h )
diff --git a/curl-config.in b/curl-config.in
index aec39a333..76157979a 100644
--- a/curl-config.in
+++ b/curl-config.in
@@ -60,6 +60,7 @@ while test $# -gt 0; do
     --feature|--features)
 	if test "@USE_SSLEAY@" = "1"; then
           echo "SSL"
+          NTLM=1
         fi
 	if test "@KRB4_ENABLED@" = "1"; then
           echo "KRB4"
@@ -73,6 +74,16 @@ while test $# -gt 0; do
 	if test "@HAVE_ARES@" = "1"; then
           echo "AsynchDNS"
         fi
+	if test "@IDN_ENABLED@" = "1"; then
+          echo "IDN"
+        fi
+	if test "@USE_WINDOWS_SSPI@" = "1"; then
+          echo "SSPI"
+          NTLM=1
+        fi
+	if test "$NTLM" = "1"; then
+          echo "NTLM"
+        fi
 	;;
 
     --protocols)