mention the configure script and how to link to a local libtls

README.md

@@ -40,6 +40,9 @@ The build is as simple as
 
     make
 
+If the configure scripts fails to pick up something, please open an
+isuse or notify me via email.
+
 To install execute:
 
     make install
@@ -60,6 +63,23 @@ and then run it with something along the lines of
 
 ellipses used for brevity.
 
+#### Local libretls
+
+This is **NOT** recommended, please try to port LibreSSL/LibreTLS to
+your distribution of choice or use docker instead.
+
+However, it's possible to link `gmid` to locally-installed libtls
+quite easily.  (It's how I test gmid on Fedora, for instance)
+
+Let's say you have compiled and installed libressl in `$LIBRESSL`,
+then you can build `gmid` with
+
+    ./configure CFLAGS="-I$LIBRESSL/include" \
+                LDFLAGS="$LIBRESSL/lib/libtls.a -lssl -lcrypto"
+    make
+
+(Fedora requires also `-lpthread` for some reason)
+
 
 ## Architecture/Security considerations