Boost 1.58: Boost.atomic not found

[fpnick]

Hi,

I'm working on Ubuntu 16.04.4 LTS and trying to compile sparsex.
When doing a plain ./configure I get

checking for Boost library >= 1.48... yes (found version 1.58)
checking for Boost.atomic... no
configure: error: Boost.atomic was not found. Check your installation of the Boost library or, if you specified a variant with the `--with-boost_atomic' option, either omit it or try another variant.

However, when using ./configure --with-boostlibdir=/usr/lib/x86_64-linux-gnu it seems to work:

checking for Boost library >= 1.48... yes (found version 1.58)
checking for Boost.atomic... yes
checking for Boost.regex... yes
checking for Boost.serialization... yes
checking for Boost.system... yes

I don't see why configure doesn't find Boost.atomic in the first try?