The scripts/pacakges/galera.spec file for galera4 has a conditional statement to require python3-scons for rhel 8, and requires the scons package for all others. This results in build failures on RHEL 9.

A quick one-character fix is to change the == to >= in the spec file like so:

diff --git a/scripts/packages/galera.spec b/scripts/packages/galera.spec

index 3f2a89bf..9ed73982 100644

--- a/scripts/packages/galera.spec

+++ b/scripts/packages/galera.spec

@@ -53,7 +53,7 @@ BuildRoot:     %{_tmppath}/%{name}-%{version}

 BuildRequires: glibc-devel

 BuildRequires: openssl-devel

-%if 0%{?rhel} == 8

+%if 0%{?rhel} >= 8

 BuildRequires: python3-scons

 %else

 BuildRequires: scons

Not sure if there are other places where RHEL 8 is hard coded or not.

Also it is worth noting that the python3-scons package is no longer available in the RHEL codeready-builder repository like it was in RHEL 8. Instead the package needs to be installed from the EPEL repository.