Bug#899311: libmapnik3.0: not installable

[Vincent Lefevre]

Package: libmapnik3.0
Version: 3.0.20+ds-1
Severity: grave
Justification: renders package unusable

libmapnik3.0 is not installable:

# apt install libmapnik3.0
[...]
The following packages have unmet dependencies:
 libmapnik3.0 : Depends: libboost-regex1.62.0 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
# apt install libmapnik3.0 libboost-regex1.62.0
[...]
The following packages have unmet dependencies:
 libboost-regex1.62.0 : Breaks: libmapnik3.0 (< 3.0.20+ds-1+b2) but 3.0.20+ds-1+b1 is to be installed
E: Unable to correct problems, you have held broken packages.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.16.0-1-amd64 (SMP w/12 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=POSIX (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages libmapnik3.0 depends on:
ii  fonts-dejavu               2.37-1
pn  gdal-abi-2-1-2             <none>
pn  gdal-abi-2-2-3             <none>
ii  libboost-filesystem1.62.0  1.62.0+dfsg-5.1
pn  libboost-regex1.62.0       <none>
ii  libboost-system1.62.0      1.62.0+dfsg-5.1
ii  libc6                      2.27-3
ii  libcairo2                  1.14.10-1
ii  libfreetype6               2.6.3-3.2
ii  libgcc1                    1:8.1.0-3
pn  libgdal20                  <none>
ii  libharfbuzz0b              1.4.2-1
ii  libicu57                   57.1-9
ii  libicu60                   60.2-6
ii  libjpeg62-turbo            1:1.5.2-2+b1
ii  libpng16-16                1.6.34-1
ii  libpq5                     10.4-2
pn  libproj12                  <none>
pn  libproj13                  <none>
ii  libsqlite3-0               3.23.1-1
ii  libstdc++6                 8.1.0-3
ii  libtiff5                   4.0.9-5
ii  libwebp6                   0.6.1-2
ii  libxml2                    2.9.4+dfsg1-6.1+b1
ii  zlib1g                     1:1.2.11.dfsg-1

libmapnik3.0 recommends no packages.

Versions of packages libmapnik3.0 suggests:
pn  postgis  <none>