ucommon 6.3.0 fails to build on OS X with clang

[Baptiste Fontaine]

Hello,

ucommon 6.3.0, downloaded from 
http://ftpmirror.gnu.org/commonc++/ucommon-6.3.0.tar.gz [1] successfully builds 
with gcc on OS X but fails with clang 6.0 build 600. From the tarball, running 
./configure (with options) && make install:

    (…)
    tcp.cpp:460:6: error: no matching constructor for initialization of 
'std::iostream' (aka 'basic_iostream<char>')

        ,iostream(),

         ^

Configuration & logs: https://gist.github.com/bfontaine/c31ddba2ae787ba323c5


Regards,

--
Baptiste Fontaine

[1]: SHA1 is b578e197cf6e731c0e5465167f32a29ea5f2cd28