improve configure message and README about Boost system and filesystem
checking for Boost headers version >= 1.49.0... yes
checking for Boost's header version... 1_62
checking for the toolset name used by Boost for g++... configure: WARNING: could not figure out which toolset name to use for g++
checking boost/system/error_code.hpp usability... yes
checking boost/system/error_code.hpp presence... yes
checking for boost/system/error_code.hpp... yes
checking for the Boost system library... no
configure: error: cannot find the flags to link with Boost system
The above error had me very confused, as I was understanding it as "unable to link with Boost" (i.e., "the Boost system" as a whole) and therefore had no idea what package I needed to install in addition to what I have.
The diagnostic would be much clearer as cannot ... link with libboost-system
.
Also, "Boost system" is not part of the list of the Boost components given in the README file, so I had no clue it was a thing.
Boost filesystem is checked but not in README as well.