configure: WARNING: ext/hash_map: present but cannot be compiled configure: WARNING: ext/hash_map: check for missing prerequisite headers? configure: WARNING: ext/hash_map: see the Autoconf documentation configure: WARNING: ext/hash_map: section "Present But Cannot Be Compiled" configure: WARNING: ext/hash_map: proceeding with the compiler‘s result configure: WARNING: ## --------------------------------- ## configure: WARNING: ## Report this to [email protected] ## configure: WARNING: ## --------------------------------- ## checking for ext/hash_map... no configure: error: in `/home/ha/tair‘: configure: error: hash_map not found See `config.log‘ for more details