I need the following patch to compile curl git HEAD against mbedtls.
Otherwise I get the following compiler error message:

  CC vtls/libcurl_la-mbedtls.lo
vtls/mbedtls.c: In function 'mbedtls_version_from_curl':
vtls/mbedtls.c:162:10: error: 'ssl_version' undeclared (first use in this function)
   switch(ssl_version) {
          ^
vtls/mbedtls.c:162:10: note: each undeclared identifier is reported only once for each function it appears in
Makefile:2088: recipe for target 'vtls/libcurl_la-mbedtls.lo' failed

It seems the error was introduced in 6448f98c1857de521fb2dd3f9d4e5659845b5474

---
 lib/vtls/mbedtls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/vtls/mbedtls.c b/lib/vtls/mbedtls.c
index dbcb169..b131713 100644
--- a/lib/vtls/mbedtls.c
+++ b/lib/vtls/mbedtls.c
@@ -159,7 +159,7 @@ static Curl_send mbed_send;
 
 static CURLcode mbedtls_version_from_curl(int *mbedver, long version)
 {
-  switch(ssl_version) {
+  switch(version) {
     case CURL_SSLVERSION_TLSv1_0:
       *mbedver = MBEDTLS_SSL_MINOR_VERSION_1;
       return CURLE_OK;
-- 
2.1.4
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