Galera 25.3.5 fails to compile (10.3-RELEASE)
with

/usr/bin/ld: undefined reference to symbol `_ZNSt3__18ios_base5clearEj' (try adding -lc++)
//usr/lib/libc++.so.1: could not read symbols: Bad value
clang: error: linker command failed with exit code 1 (use -v to see invocation)
scons: *** [gcache/src/test] Error 1

If I add on the commandline
make CC=/usr/local/bin/gcc CXX=/usr/local/bin/g++ CPP=/usr/local/bin/cpp

or in the Makefile

CXXFLAGS+=     -Wl,-rpath= ${LOCALBASE}/bin/gcc
LDFLAGS+=      -lc++

it compiles.

There are still warnings like:
/usr/local/include/check.h:454:73: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments]
/usr/local/include/check.h:454:75: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments]
     _ck_assert_failed(__FILE__, __LINE__, "Assertion '"#expr"' failed" , ## __VA_ARGS__, NULL)
                                                                          ^
/usr/local/include/check.h:454:75: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments]
/usr/local/include/check.h:454:73: warning: token pasting of ',' and __VA_ARGS__ is a GNU extension [-Wgnu-zero-variadic-macro-arguments]
     _ck_assert_failed(__FILE__, __LINE__, "Assertion '"#expr"' failed" , ## __VA_ARGS__, NULL)