Ensure that your OpenSSL libraries have been built to include RSA support
either internally or through RSAref.
+13. "scp: command not found" errors
+
+scp must be in the default PATH on both the client and the server. You may
+need to use the --with-default-path option to specify a custom path to
+search on the server. This option replaces the default path, so you need
+to specify all the current directories on your path as well as where you
+have installed scp. For example:
+
+./configure --with-default-path=/bin:/usr/bin:/usr/local/bin:/path/to/scp
+