I have now noticed that this problem occurs partially on Solaris 9 also.
But on Solaris 9 only the first line is garbage, which is the line:

   Eiffel C/C++ Compilation Tool - Version 6.5

(except that it shows up as unprintable characters).  I also get the lines like

   (ec:11050): Pango-WARNING **: Invalid UTF-8 string passed to pango_layout_set_text()

but just not as many.

So perhaps you can reproduce this on Solaris 9.