Include openssl fix

open-tee/README.md

@@ -10,3 +10,18 @@ It also may be necessary to use `-export-dynamic` instead, using only one dash.
 
 While Open-TEE works successfully on 18.04, there are issues running the engine on 20.10. 
 Specifically the `tee_launcher` process is not created as expected in `emulator/opentee-main/main.c`
+
+In order to successfully build on 20.10, it is necessary to utilize an older version of OpenSSL as well.
+The following commands should help address these issues.
+
+# Download openssl 1.0.2 sources, and replace includes
+
+sudo mv /usr/include/openssl /usr/include/openssl_original
+sudo mv openssl-1.0.2l/include/openssl /usr/include/openssl
+
+sudo mv /usr/include/x86_64-linux-gnu/openssl/opensslconf.h /usr/include/x86_64-linux-gnu/openssl/opensslconf.h.original
+sudo cp /usr/include/openssl/opensslconf.h /usr/include/x86_64-linux-gnu/openssl/opensslconf.h
+
+# Strip leading dash in CA Makefile, after default generation using build instructions.
+sed -i -- 's/\-\-export\-dynamic/\-export\-dynamic/g' Open-TEE/build/CAs/Makefile
+