Upstream PR:

https://github.com/codership/galera/pull/512

diff -up galera-25.3.23/SConstruct.bak galera-25.3.23/SConstruct

--- galera-25.3.23/SConstruct.bak	2018-07-13 15:14:49.059835554 +0200

+++ galera-25.3.23/SConstruct	2018-07-13 15:19:07.717967794 +0200

@@ -194,8 +194,8 @@ if link != 'default':

     env.Replace(LINK = link)

 # Get compiler name/version, CXX may be set to "c++" which may be clang or gcc

-cc_version = str(read_first_line(env['CC'].split() + ['--version']))

-cxx_version = str(read_first_line(env['CXX'].split() + ['--version']))

+cc_version = str(read_first_line(env['CC'].split() + ['--version']).decode())

+cxx_version = str(read_first_line(env['CXX'].split() + ['--version']).decode())

 print('Using C compiler executable: ' + env['CC'])

 print('C compiler version is: ' + cc_version)