BUG #16858: clang10-devel packages are missing in SLES15 SP2 in general - Mailing list pgsql-bugs

The following bug has been logged on the website:

Bug reference:      16858
Logged by:          Heiko Kaempf
Email address:      h.kaempf@owl-it.de
PostgreSQL version: 12.0
Operating system:   SUSE Linux Enterprise Server 15 SP2
Description:

Dear PostgreSQL developer team,

we have just incuded repositories of PostgreSQL 11, 12 and 13 for
SLES15 SP2 to our SUSE Manager environment from the following download
links:
https://download.postgresql.org/pub/repos/zypp/11/suse/sles-15.2-x86_64/
https://download.postgresql.org/pub/repos/zypp/12/suse/sles-15.2-x86_64/
https://download.postgresql.org/pub/repos/zypp/13/suse/sles-15.2-x86_64/

When trying to install the development package for PostgreSQL version 11 or
12
there is a dependency to clang10-devel package that doesn't seem to be a
part of SLES15 SP2.
As far as we know, clang9 and clang9-devel versions are included from SUSE
for SLES15 SP2.
But installing of PostgreSQL version 13 is possbile, so maybe this version
is bound to clang9?

Please find below detailed version of our Linux version and the error
messages:
# cat /etc/os-release
NAME="SLES"
VERSION="15-SP2"
VERSION_ID="15.2"
PRETTY_NAME="SUSE Linux Enterprise Server 15 SP2"
ID="sles"
ID_LIKE="suse"
ANSI_COLOR="0;32"
CPE_NAME="cpe:/o:suse:sles:15:sp2"

# zypper in postgresql11-devel
Refreshing service 'spacewalk'.
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides clang10-devel needed by
postgresql11-devel-11.10-1PGDG.sles15.x86_64
 Solution 1: do not install postgresql11-devel-11.10-1PGDG.sles15.x86_64
 Solution 2: break postgresql11-devel-11.10-1PGDG.sles15.x86_64 by ignoring
some of its dependencies

Choose from above solutions by number or cancel [1/2/c/d/?] (c): 1
Resolving dependencies...
Resolving package dependencies...
Nothing to do.

# zypper in postgresql12-devel
Refreshing service 'spacewalk'.
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides clang10-devel needed by
postgresql12-devel-12.5-1PGDG.sles15.x86_64
 Solution 1: do not install postgresql12-devel-12.5-1PGDG.sles15.x86_64
 Solution 2: break postgresql12-devel-12.5-1PGDG.sles15.x86_64 by ignoring
some of its dependencies

Choose from above solutions by number or cancel [1/2/c/d/?] (c): 1
Resolving dependencies...
Resolving package dependencies...
Nothing to do.

# zypper in postgresql13-devel
Refreshing service 'spacewalk'.
Loading repository data...
Reading installed packages...
Resolving package dependencies...

The following NEW package is going to be installed:
  postgresql13-devel

The following package has no support information from its vendor:
  postgresql13-devel

1 new package to install.
Overall download size: 2.6 MiB. Already cached: 0 B. After the operation,
additional 11.2 MiB will be used.
Continue? [y/n/v/...? shows all options] (y): y
Retrieving package postgresql13-devel-13.1-1PGDG.sles15.x86_64
                                          (1/1),   2.6 MiB ( 11.2 MiB
unpacked)
Retrieving: postgresql13-devel-13.1-1PGDG.sles15.x86_64.rpm
..........................................................................................[done]
postgresql13-devel-13.1-1PGDG.sles15.x86_64.rpm:
    Header V4 DSA/SHA1 Signature, key ID 442df0f8: NOKEY
    V4 DSA/SHA1 Signature, key ID 442df0f8: NOKEY

Looking for gpg key ID 442DF0F8 in cache /var/cache/zypp/pubkeys.
Repository DEV - GKDZEN - PostgreSQL13 for SLES15-SP2-packages-x86_64 does
not define additional 'gpgkey=' URLs.
postgresql13-devel-13.1-1PGDG.sles15.x86_64 (DEV - GKDZEN - PostgreSQL13 for
SLES15-SP2-packages-x86_64): Signature verification failed [4-Signatures
public key is not available]
Abort, retry, ignore? [a/r/i] (a): i

Checking for file conflicts:

.........................................................................................................................[done]
(1/1) Installing: postgresql13-devel-13.1-1PGDG.sles15.x86_64
........................................................................................[done]
Additional rpm output:
warning:

/var/cache/zypp/packages/spacewalk:dev-gkdzen-postgresql13-for-sle15-sp2-packages-x86_64/getPackage/1/c4c3770da7836f3723d800beecd5a4ce8e5ded539da53c9a6c149542d952359f/postgresql13-devel-13.1-1PGDG.sles15.x86_64.rpm:
Header V4 DSA/SHA1 Signature, key ID 442df0f8: NOKEY

Many thanks
Kind regard
Heiko Kaempf