guile-1.8.0 configure warnings for MacOS X 10.4

[Steven Wu]

here is the warning:

./configure --prefix=/usr --with-threads
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for gawk... no
checking for mawk... no
checking for nawk... no
checking for awk... awk
checking whether make sets $(MAKE)... yes
checking whether to enable maintainer-specific portions of  
Makefiles... no
checking build system type... powerpc-apple-darwin8.5.0
checking host system type... powerpc-apple-darwin8.5.0
checking for a BSD-compatible install... /usr/bin/install -c
checking for gcc... gcc
<skipped>
checking libc.h usability... no
checking libc.h presence... yes
configure: WARNING: libc.h: present but cannot be compiled
configure: WARNING: libc.h:     check for missing prerequisite headers?
configure: WARNING: libc.h: see the Autoconf documentation
configure: WARNING: libc.h:     section "Present But Cannot Be Compiled"
configure: WARNING: libc.h: proceeding with the preprocessor's result
configure: WARNING: libc.h: in the future, the compiler will take  
precedence
configure: WARNING:     ## -------------------------------- ##
configure: WARNING:     ## Report this to the guile lists.  ##
configure: WARNING:     ## -------------------------------- ##
checking for libc.h... yes
<skipped>
checking netdb.h usability... no
checking netdb.h presence... yes
configure: WARNING: netdb.h: present but cannot be compiled
configure: WARNING: netdb.h:     check for missing prerequisite headers?
configure: WARNING: netdb.h: see the Autoconf documentation
configure: WARNING: netdb.h:     section "Present But Cannot Be  
Compiled"
configure: WARNING: netdb.h: proceeding with the preprocessor's result
configure: WARNING: netdb.h: in the future, the compiler will take  
precedence
configure: WARNING:     ## -------------------------------- ##
configure: WARNING:     ## Report this to the guile lists.  ##
configure: WARNING:     ## -------------------------------- ##
checking for netdb.h... yes
<skipped>
__
I have the log saved, and feel free to ask me for that.

steve