Help for Build DEB and/or RPM Packages

[siqin]

Hi All.

I am want to build LibreOffice on Ubuntu 20.10.

According to the "Building LibreOffice on Linux and *BSD systems: Tips 
and Tricks"

1. Install the dependencies.

     Debian and Ubuntu

2. Cloning and building.

     git clone https://gerrit.libreoffice.org/core libreoffice
     cd libreoffice
     ./autogen.sh
     make check

3. Running build

     instdir/program/soffice --writer
     instdir/program/soffice --calc

It was okay so far, But when build DEB and/or RPM Packages, I got an error.

     ./autogen.sh --with-distro=LibreOfficeLinux 
--with-package-format="deb rpm" --enable-epm
     make

./configure: line 40704: cd: ../share/ant/bin: No such file or directory
./configure: line 40704: cd: ../share/ant/bin: No such file or directory
./configure: line 40704: cd: ../share/ant/bin: No such file or directory
./configure: line 40704: cd: ../share/ant/bin: No such file or directory

.....

Did I miss something?

     ant -version

     Apache Ant(TM) version 1.10.8 compiled on January 8 1970

Thank you.