How do I install it from source?

Step 1:
  You must install some packages: "sudo aptitude install libdbus-glib-1-dev, pkg-kde-tools, cmake, kdelibs5-dev, libplasma-dev, cracklib-dev"

Step 2:
  Extract the tarball: "tar xzf fusible_*.tar.gz"

Step 3:
  Create a build directory: "mkdir Build". Then enter in "cd Build".

Step 4:
  Execute CMake to create makefiles: "cmake ../fusible"
  You can use some options:
    BUILD_SMUDD: default is ON. Set OFF if you do not want to build and install SMUDd.
    BUILD_PLASMOIDS: default is ON. Set OFF if you do not want to build and install plasmoids.
    BUILD_FUSEAPI_PLUGINS: default is ON. Set OFF if you do not want to build and install FuseAPI plugins.
    BUILD_FUSIBLE_PLUGINS: default is ON. Set OFF if you do not want to build and install Fusible plugins.
    BUILD_TRANSLATIONS: default is ON. Set OFF if you do not want to build and install translations.

  e.g.: "cmake -DBUILD_TRANSLATIONS=OFF -DBUILD_FUSIBLE_PLUGINS=OFF ../fusible" will prepare the project without translations and without plugins for Fusible

Step 5:
  Build the project: "make"

Step 6:
  Install the project: "sudo make install"

Step 7:
  Enjoy :-P