It appears that the configure options for opensc have changed in 0.12.0: $ emerge -pv opensc These are the packages that would be merged, in order: Calculating dependencies... done! [ebuild U ] dev-libs/opensc-0.12.0 [0.11.13] USE="readline%* ssl%* zlib%* -doc -pcsc-lite (-openct%*)" 0 kB From build.log: ./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --libdir=/usr/lib64 --docdir=/usr/share/doc/opensc-0.12.0 --htmldir=/usr/share/doc/opensc-0.12.0/html --disable-doc -disable-pcsc --enable-readline --enable-openssl --enable-zlib --with-pinentry=/usr/bin/pinentry <--snip--> configure: error: Only one of --enable-pcsc, --enable-openct, --enable-ctapi can be specified
Thanks for reporting, fixed now.
Or maybe not. Reopening and getting a mug of coffee.
Okay this time it should be really fixed.