[Builder] unable to build builder (installed builder from flatpak)

[Felix Schwarz <felix schwarz oss schwarz eu>]

I'm trying to build builder after I installed the nightly builder flatpak on F25.

This should be easy enough, right?

At first I got this error:
  configure: error: --enable-hello-cpp-plugin requires --enable-idemm=yes

Now it turned out that this specific error message is just due a faulty a
condition ( https://bugzilla.gnome.org/show_bug.cgi?id=775975 ) but my patch
only reveals the real source:

configure: WARNING: The documentation cannot be generated because
not all of the required tools are available: dot doxygen
checking for GMMPROC_DIR... /app/lib/glibmm-2.4/proc
checking for GMMPROC_EXTRA_M4_DIR...
checking for IDEMM... no
configure: error: --enable-idemm requires gtkmm >= 3.19.12

hmm...

Any ideas?

Is this possibly because my flatpak install environment is somehow "weird"? My
host machine was upgraded von F24 -> F25 and I installed the flatpaks on F24.
How can get a "clean slate" with regard to flatpak? (I don't care if all
flatpak repos/settings etc. are gone, no valuable stuff in there.)

Felix