6.2.0.0.alpha1: make distro-pack-install failure

hello

just tried to build/install latest 6.2.0.0.alpha1

make distro-pack-install fails with:

    ----8<----
    ERROR: The following files could not be found: 
    ERROR: File not found: libmysql_jdbclo.so
    ---->8----

No idea about the reason (all my previous builds did not give any problem)

My specs:

install:20> uname -sr
Linux 4.19.0

install:18> gcc --version
gcc (GCC) 8.2.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


build configuration:

--prefix=/opt/stow.d/versions/libreoffice-6.2.0.0.alpha1/usr
--libdir=/opt/stow.d/versions/libreoffice-6.2.0.0.alpha1/usr/lib64
--sysconfdir=/opt/stow.d/versions/libreoffice-6.2.0.0.alpha1/etc/libreoffice
--with-vendor=BLFS
--with-lang='en-US it'
--with-help
--with-myspell-dicts
--without-junit
--without-system-dicts
--disable-dconf
--disable-odk
--enable-release-build=yes
--enable-python=system
--with-system-apr
--with-system-boost
--with-system-cairo
--with-system-curl
--with-system-expat
--with-system-graphite
--with-system-harfbuzz
--with-system-icu
--with-system-jpeg
--with-system-lcms2
--with-system-libatomic_ops
--with-system-libpng
--with-system-libxml
--with-system-neon
--with-system-nss
--with-system-odbc
--with-system-openldap
--with-system-openssl
--with-system-poppler
--disable-postgresql-sdbc
--with-system-redland
--with-system-serf
--with-system-zlib
--disable-cups
--with-java=no
--with-krb5=no
--with-gssapi=no
--disable-werror


thanks in advance for any hint

ciao
-g