*** locale must be set ***

tce-load -i compiletc meson itstool gtk3-dev gsettings-desktop-schemas-dev intltool exiv214-dev clutter-gtk-dev lcms2-dev librsvg-dev libsecret-dev libsoup-dev libwebp1-dev libraw-dev libchamplain-dev desktop-file-utils

https://ftp.gnome.org/pub/GNOME/sources/gthumb/3.8/gthumb-3.8.3.tar.xz

cd gthumb-3.8.3

sudo cp /tmp/tcloop/gcc_libs-dev/usr/local/lib/libgomp.spec /usr/lib

mkdir build
cd build

CC="gcc -flto -fuse-linker-plugin -mtune=generic -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -mtune=generic -Os -pipe" meson --prefix=/usr/local --localstatedir=/var --buildtype=plain -Dlibchamplain=true

[-fno-exceptions -fno-rtti fails]

ninja [2m 9.32s]
sudo ninja install

Message: configuration summary:

           project: gthumb 3.8.3
               api: 3.8
            prefix: /usr/local
      run in place: false
             exiv2: true
           clutter: true
         gstreamer: true
      libchamplain: true
             lcms2: true
            colord: true
       libjpeg >=8: false
  progressive jpeg: true
              tiff: true
              webp: true
               raw: true
               svg: true
      web services: false
         libsecret: false
        libbrasero: false
        web albums: true
        vector ops: true