I have successfully downloaded all of the files and libraries necessary for compiling and making the Courier Mail Server version 1.0.6.  I have also downloaded most of the Sox files as well.  I am attempting to build the above-mentioned mail server in my Oracle VM VirtualBox Debian version 9.8 ( stretch ) Linux virtual machine.  As soon as I finished downloading the above-mentioned Sox files, I typed in the following commands from my Linux command prompt:

    # ./configure

at which time that command appeared to run correctly.  Then I typed:

    # make -s

again, at which time that command appeared to run correctly.  Then I typed:

    # make install ( after having su’d to my root account ).

This command also appeared to run correctly.

Then, I changed directories ( from `russell@debian:~/Dowloads/courier-1.0.6.20190203/courier-1.0.6.20190203/sox-14.4.2/sox-14.4.2` to `russell@debian:~/Downloads/courier-1.0.6.20190203/courier-1.0.6.20190203` ) using the `cd` command.  Keep in mind that I typed in the following command at my Debian version 9.8 ( stretch ) Linux prompt before typing the above-mentioned Linux commands:

    # MAKEFLAGS = “-j 4.”

This command was entered from my “sh” shell ( the default shell on my system is the Borne Again Shell ( bash )).  Whatever the case may be, I typed in the following Linux command:

    # ./configure

after changing directories ( as mentioned above ), and that command appeared to run correctly.  Then, I typed the following Linux command:

    # make

and received the following error message: “No targets specified and no makefile found.  Stop.”  What have I done wrong?  I was disappointed to get this far in the process my first time without being completely successful.  What do I need to do?