Compiling – error: “boost::asio header not found.”

checking for __gmpz_init2 in -lgmp… yes
checking for main in -lboost_thread-gcc-mt… no
checking for main in -lboost_thread-mt… no
checking for main in -lboost_thread… yes
checking for main in -lboost_regex-gcc-mt… no
checking for main in -lboost_regex-mt… no
checking for main in -lboost_regex… yes
checking for main in -lboost_system-gcc-mt… no
checking for main in -lboost_system-mt… no
checking for main in -lboost_system… yes
checking for main in -lboost_date_time-gcc-mt… no
checking for main in -lboost_date_time-mt… no
checking for main in -lboost_date_time… yes
checking for main in -lboost_filesystem-gcc-mt… no
checking for main in -lboost_filesystem-mt… no
checking for main in -lboost_filesystem… yes
checking for boost/asio.hpp… no
configure: error: “boost::asio header not found.”