Hi, This package still has a C++14 dependency, at least according to Clang.
richard@deodand:~/junk$ clang++-6.0 $(pkg-config --cflags glibmm-2.4) -std=c++11 -c t.cc In file included from t.cc:1: /usr/include/glibmm-2.4/glibmm/variant.h:2132:3: warning: use of this statement in a constexpr function is a C++14 extension [-Wc++14-extensions] (void)arg; ^ 1 warning generated. richard@deodand:~/junk$ clang++-6.0 $(pkg-config --cflags glibmm-2.4) -std=c++14 -c t.cc richard@deodand:~/junk$ cat t.cc #include <glibmm/variant.h> richard@deodand:~/junk$ dpkg -l libglibmm*dev clang-6.0 Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend |/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad) ||/ Name Version Architecture Description +++-==============-============-============-================================= ii clang-6.0 1:6.0~svn311 amd64 C, C++ and Objective-C compiler ( ii libglibmm-2.4- 2.54.1-1 amd64 C++ wrapper for the GLib toolkit richard@deodand:~/junk$ ttfn/rjk