This is actually libreoffice-3.4.99.3 in Gentoo. I have a quad core CPU and was building libreoffice with `make -j5`. I saw the following at some point: Entering /var/tmp/portage/app-office/libreoffice-3.4.99.3/work/libreoffice-core-3.4.99.3/xmlscript/prj Compiling: UnoControls/source/controls/progressbar.cxx Compiling: UnoControls/source/controls/framecontrol.cxx Compiling: UnoControls/source/controls/progressmonitor.cxx Compiling: UnoControls/source/controls/OConnectionPointHelper.cxx Compiling: UnoControls/source/controls/OConnectionPointContainerHelper.cxx [ build YAC ] rsc/source/parser/rscyacc [ build CXX ] rsc/source/parser/erscerr [ build CXX ] rsc/source/parser/rscdb [ build CXX ] rsc/source/parser/rscibas [ build CXX ] rsc/source/parser/rscicpx [ build CXX ] rsc/source/parser/rscinit /var/tmp/portage/app-office/libreoffice-3.4.99.3/work/libreoffice-core-3.4.99.3/rsc/source/parser/rscyacc.y: conflicts: 2 shift/reduce Compiling: UnoControls/source/controls/statusindicator.cxx [ build PKG ] xmlscript_inc /var/tmp/portage/app-office/libreoffice-3.4.99.3/work/libreoffice-core-3.4.99.3/rsc/source/parser/rscibas.cxx:50:23: fatal error: rscyacc.hxx: No such file or directory compilation terminated. If I do a `make clean; make -j5` again in that directory, it sometimes succeeds. I have no idea how your makefiles work, or if you're even actively tracking dependencies or what. Let me know if you need anything else.
I saw it at several occasions. And I am probably responsible for the problem, too :)
fixed by commit cf23f57ae6bb7af689a45e0a850c3c2f67a8f810