hi everyone, 
    
I am working on packaging a matlab/octave toolbox that involves
      multiple source tarballs
    
https://salsa.debian.org/pkg-octave-team/octave-iso2mesh
this toolbox contains a number of built-in utilities that are
      linked to the source repo via submodules
    
https://github.com/fangq/iso2mesh/tree/master/tools
however, the github release tarball does not contain these submodules and I must combine those to build the package.
I previous had used a shell script to merge the source code trees and create a single .orig.tar.gz, however, I was told that using debian/repack and uscan is the preferred way to perform changes like this.
I notice that debian/watch file supports multiple source
      components, so I wrote the below watch file:
    
      
version=3
      
      opts="dversionmangle=s/\+dfsg\.\d+$//,filenamemangle=s/\S+\/v?(\S+)\.tar\.gz/iso2mesh-$1\.tar\.gz/"
        \
          https://github.com/fangq/iso2mesh/tags
        .*/v?(\d\S+)\.tar\.gz \
          debian debian/repack
      
      https://github.com/fangq/cork/releases
        .*/v(\d[\d\.]*)\.(?:tar.gz|tar.bz2|tar.xz)
      https://github.com/fangq/meshfix/releases
        .*/v(\d[\d\.]*)\.(?:tar.gz|tar.bz2|tar.xz)
    
    
but when I ran uscan --verbose, it only
      downloaded/repacked the main source file, but refused to download
      the components
    
...
      uscan info: Matching target for filenamemangle:
        /fangq/iso2mesh/archive/v1.9.5.tar.gz
      uscan info: Download filename (filenamemangled):
        iso2mesh-1.9.5.tar.gz
      ...
      Removing non-DFSG-free files:
      removed
        '/tmp/tmp.uNMHl78FqP/octave-iso2mesh-1.9.1.orig/bin/README.txt'
      Rebuilding DFSG-free upstream source tarball:
      Moving completed upstream tarball to
        ‘../octave-iso2mesh_1.9.1.orig.tar.gz’:
      ...
      uscan info: Newest upstream tarball version selected
        for download (uversionmangled): 0.9
      uscan info: Download filename (filenamemangled):
        v0.9.tar.gz
      uscan info: Newest version of octave-iso2mesh on
          remote site is 0.9, local version is 1.9.1
      uscan info:    => Only older package available
        from
           
        https://github.com/fangq/cork/archive/v0.9.tar.gz
      ...
      uscan info: Scan finished
    
    
I am wondering if you know any sample package that uses repack/uscan to combine multiple source packages? The uscan manpage mentioned about MUT, but I could not find a working example.
thanks, let me know if you have any suggestions. 
    
Qianqian