configure: WARNING: X11/extensions/extutil.h: present but cannot be compiled configure: WARNING: X11/extensions/extutil.h: check for missing prerequisite headers? configure: WARNING: X11/extensions/extutil.h: see the Autoconf documentation configure: WARNING: X11/extensions/extutil.h: section "Present But Cannot Be Compiled" configure: WARNING: X11/extensions/extutil.h: proceeding with the preprocessor's result configure: WARNING: X11/extensions/extutil.h: in the future, the compiler will t ake precedence configure: WARNING: ## ------------------------------------------ ## configure: WARNING: ## Report this to the AC_PACKAGE_NAME lists. ## configure: WARNING: ## ------------------------------------------ ## It said report it, so I am. If I have made a mistake, just say so. It seems t me that something could be wrong with the kdeutils package (3.5.2), so whether this goes to the Gentoo devs or KDE I don't know. If I put it in the wrong place, forward it and reply that this kind of error goes elsewhere.
This is not an error, it's a warning, and that needs to be reported upstream - i.e., http://bugs.kde.org/.
Ignorable, right now autoconf does not fail with this, and nobody is fixing these issues with KDE's autoconf as KDE4 will use cmake before any new version of autotools changing this behaviour will be released.