tce-load -i compiletc meson glib2-dev libsigc++3-dev

wget https://download.gnome.org/sources/glibmm/2.78/glibmm-2.78.1.tar.xz

cd glibmm-2.78.1

mkdir build-lib
cd build-lib

CC="gcc -flto -mtune=generic -Os -pipe" CXX="g++ -flto -mtune=generic -Os -pipe -DNDEBUG" meson --prefix=/usr/local --localstatedir=/var --buildtype=plain -Dbuild-documentation=false -Dbuild-examples=false

ninja [3m 4.62s]
sudo ninja install

glibmm 2.78.1

         Maintainer mode: if-git-build (false)
       Compiler warnings: min (warning_level: 1, werror: false)
    Build deprecated API: true
Build HTML documentation: false
  Build example programs: false
Directories:
                  prefix: /usr/local
              includedir: /usr/local/include
        includeglibmmdir: /usr/local/include/glibmm-2.68
         includegiommdir: /usr/local/include/giomm-2.68
                  libdir: /usr/local/lib
         glibmmconfigdir: /usr/local/lib/glibmm-2.68/include
          giommconfigdir: /usr/local/lib/giomm-2.68/include
              gmmprocdir: /usr/local/lib/glibmm-2.68/proc
            pkgconfigdir: /usr/local/lib/pkgconfig
                 datadir: /usr/local/share
                  docdir: /usr/local/share/doc/glibmm-2.68
              devhelpdir: /usr/local/share/devhelp/books/glibmm-2.68
------
Build targets in project: 62

glibmm 2.78.1

  User defined options
    buildtype          : plain
    localstatedir      : /var
    prefix             : /usr/local
    build-documentation: false
    build-examples     : false