Checked into GIT, Manuel's DPX list (read but not write) new files and modifications to existing files.
Added in the changes Andrew provided in addition to accommodate other O/S like Termux (hopefully did not miss anything so if Andrew could check, that would be appreciated).
I had already redone the libvpx.patch when it failed so I could compile, but later put in Andrew's 0070-Fix-libdpx-patch.patch anyway. And of course, added in 0071-Add-without-libdpx-to-configure.patch and did a rebuild.
BUT, I have not been able to actually get a DPX list file to load (hoping Andrea can).
BTW, was the 1 line fix in filelist.C an existing bug?
Thanks for the auxiliary help. ...Phyllis