checking resolv.h usability... no
checking resolv.h presence... yes
configure: WARNING: resolv.h: present but cannot be compiled
configure: WARNING: resolv.h: check for missing prerequisite headers?
configure: WARNING: resolv.h: see the Autoconf documentation
configure: WARNING: resolv.h: section "Present But Cannot Be Compiled"
configure: WARNING: resolv.h: proceeding with the preprocessor's result
configure: WARNING: resolv.h: in the future, the compiler will take precedence
configure: WARNING: ## ------------------------------------------ ##
configure: WARNING: ## Report this to the AC_PACKAGE_NAME lists. ##
configure: WARNING: ## ------------------------------------------ ##
checking for resolv.h... yes

./configure時に
困難でました。。。resolv.hが原因だと思われますが、、、どうすればよいでしょうか。。。