Problems building octave

[Torsten]

I suddenly encounter problems building octave. With an empty .build-dir and

  ./bootstrap
  cd .build
  ../configure
  make

I get the error

Making all in interpreter
make[3]: Entering directory
`/home/ttl/software/octave/.build/doc/interpreter'
../../run-octave -f -q -H -p ../../../doc/interpreter --eval
"geometryimages ('convhull', 'eps');"
qhull input error: not enough points (0) to construct initial simplex
(need 3)
While executing:  | qhull Qt
Options selected for Qhull 2009.1 2009/06/14:
  Qtriangulate  _pre-merge  _zero-centrum
error: convhulln: qhull failed
error: called from:
error:   /home/ttl/software/octave/.build/../scripts/geometry/convhull.m
at line 59, column 7
error:   /home/ttl/software/octave/doc/interpreter/geometryimages.m at
line 73, column 7
make[3]: *** [convhull.eps] Error 1

The points missing for qhull are generated in geometryimages.m by

  x = -3:0.05:3;
  y = abs (sin (x));

x and y turn out to be empty because the "." in "0.05" is interpreted as
",".

This also occurs when I start octave with

  ./run-octave --no-gui

and enter a float

  octave-gui:1> 0:0.1:1    # the prompt really says octave-gui here
  ans = [](1x0)
  octave-gui:2> 0.3
  ans = 0

The effect does not occur in the real gui version.

Changing LC_NUMERIC from de_DE.UTF-8 to en_US.UTF-8  solves the problem
and I can finish the build.

Is anyone else running into this?

Torsten