I just build
HG ID for this build is "4d6392c879d7"
and again observed that the very first run terminates with signal 6 after that it runs fine:
Octave successfully built. Now choose from the following:
./run-octave - to run in place to test before installing
make check - to run the tests
make install - to install (PREFIX=/usr/local)
HG ID for this build is "4d6392c879d7"
make[2]: Leaving directory '/home/dima/src/octave/gcc_def'
make[1]: Leaving directory '/home/dima/src/octave/gcc_def'
$ ./run-octave --gui
octave exited with signal 6
$ ./run-octave --gui
(runs fine)