BUG #16859: PostGIS 30 and 31 installation on SLES15 SP2 missing package SFCGAL or gmp

The following bug has been logged on the website:

Bug reference: 16859
Logged by: heiko kaempf
Email address: h(dot)kaempf(at)owl-it(dot)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 PostGIS version 30 or 31 for PostgreSQL 11, 12 or
13
there is a dependency to missing packages SFCGAL or gmp.

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 postgis30_11
Refreshing service 'spacewalk'.
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides SFCGAL needed by
postgis30_11-3.0.3-4.sles15.x86_64
Solution 1: do not install postgis30_11-3.0.3-4.sles15.x86_64
Solution 2: break postgis30_11-3.0.3-4.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 postgis30_12
Refreshing service 'spacewalk'.
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides gmp needed by postgis30_12-3.0.3-4.sles15.x86_64
Solution 1: do not install postgis30_12-3.0.3-4.sles15.x86_64
Solution 2: break postgis30_12-3.0.3-4.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 postgis30_13
Refreshing service 'spacewalk'.
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides gmp needed by postgis30_13-3.0.3-4.sles15.x86_64
Solution 1: do not install postgis30_13-3.0.3-4.sles15.x86_64
Solution 2: break postgis30_13-3.0.3-4.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 postgis31_11
Refreshing service 'spacewalk'.
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides SFCGAL needed by
postgis31_11-3.1.0-2.sles15.x86_64
Solution 1: do not install postgis31_11-3.1.0-2.sles15.x86_64
Solution 2: break postgis31_11-3.1.0-2.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 postgis31_12
Refreshing service 'spacewalk'.
Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides gmp needed by postgis31_12-3.1.0-2.sles15.x86_64
Solution 1: do not install postgis31_12-3.1.0-2.sles15.x86_64
Solution 2: break postgis31_12-3.1.0-2.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 postgis31_13

Loading repository data...
Reading installed packages...
Resolving package dependencies...

Problem: nothing provides gmp needed by postgis31_13-3.1.0-2.sles15.x86_64
Solution 1: do not install postgis31_13-3.1.0-2.sles15.x86_64
Solution 2: break postgis31_13-3.1.0-2.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.

Many thanks
Kind regard
Heiko Kaempf