Warnings from autoconf (GNU Autoconf) 2.57

[Ross Boylan]

While trying to build the current KDE on Debian GNU/Linux testing, I
got the following warnings.  Since it asked me to report them, I'm
reporting them.  I don't know their significance.

checking X11/extensions/XKBstr.h usability... no
checking X11/extensions/XKBstr.h presence... yes
configure: WARNING: X11/extensions/XKBstr.h: present but cannot be compiled
configure: WARNING: X11/extensions/XKBstr.h: check for missing prerequisite 
headers?
configure: WARNING: X11/extensions/XKBstr.h: proceeding with the preprocessor's 
result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for X11/extensions/XKBstr.h... yes
checking for X11/extensions/XKBstr.h... (cached) yes
checking for OpenSSL... libraries /usr/lib, headers /usr/include
checking whether OpenSSL uses rsaref... no
checking for easter eggs... none found
checking for OpenSSL version... ok
checking for DPMS... yes
checking for fontconfig-config... not found
configure: WARNING: Could not find libfontconfig anywhere, check 
http://www.fontconfig.org/
checking linux/raw.h usability... no
checking linux/raw.h presence... yes
configure: WARNING: linux/raw.h: present but cannot be compiled
configure: WARNING: linux/raw.h: check for missing prerequisite headers?
configure: WARNING: linux/raw.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for linux/raw.h... yes
checking sys/raw.h usability... yes
checking sys/raw.h presence... yes
checking for sys/raw.h... yes
checking for long long... yes

...
checking X11/extensions/shape.h usability... yes
checking X11/extensions/shape.h presence... yes
checking for X11/extensions/shape.h... yes
checking for X11/extensions/XKBstr.h... (cached) yes
checking X11/extensions/XKBrules.h usability... no
checking X11/extensions/XKBrules.h presence... yes
configure: WARNING: X11/extensions/XKBrules.h: present but cannot be compiled
configure: WARNING: X11/extensions/XKBrules.h: check for missing prerequisite 
headers?
configure: WARNING: X11/extensions/XKBrules.h: proceeding with the 
preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for X11/extensions/XKBrules.h... yes
checking for X... libraries /usr/X11R6/lib, headers /usr/X11R6/include


Here are the current levels of some of the relevant packages:
ii  autoconf                  2.57-4                    automatic configure 
script builder
ii  autotools-dev             20030519.1                Update infrastructure 
for config.{guess,sub} files
ii  automake1.7               1.7.5-1                   A tool for generating 
GNU Standards-compliant Makefiles
ii  xfree86-common 4.2.1-6        X Window System (XFree86) infrastructure