I've tryied all versions ... but nothing to do :|

sandro@ci4771ht ~ $ cat /etc/make.conf
CFLAGS="-march=native -O2 -pipe"
CXXFLAGS="${CFLAGS}"
FFLAGS="${CFLAGS}"
FCFLAGS="${CFLAGS}"
LDFLAGS="${LDFLAGS} Wl,-hash-style=gnu -Wl,-z,lazy"

LLVM_TARGETS="NVPTX"

ABI_X86="64 32"
CHOST="x86_64-pc-linux-gnu"

CPU_FLAGS_X86="aes avx avx2 fma3 mmx mmxext popcnt sse sse2 sse3 sse4_1 sse4_2 ssse3"

USE="icu jit sdl X Xaw3d a52 aac aalib acl afs aim ao apm atm audiofile \
bash-completion bcmath bidi blas bluetooth bzip2 cairo nss \
calendar caps cdb cdda cddb xvmc cdparanoia cdr cgi designer \
vdpau bluray clamav cracklib crypt css ctype fat nvidia webkit \
curlwrappers dvd custom-cflags cvs cxx dbi dbm dbus dga djvu \
dri dts dv declarative dvb dvdr encode exif fam fastcgi ffmpeg \
fftw hwaccel filecaps network flac flatfile mjpeg fontconfig \
foomaticdb \ fortran ftp gcj gd gdbm geoip gif gimp git glut \
gmp gnuplot gphoto2 gpm graphviz gsl gsm guile gzip hddtemp \
iconv icq idn ieee1394 imagemagick introspection imap imlib ntfs \
inifile gstreamer inotify iodbc ios ipod jack java javascript \
jbig jabber jingle jpeg jpeg2k kontact ladspa lame lapack http \
lash ldap libass libav libffi libnotify libsamplerate libwww \
lirc lm_sensors lzma lzo mad maildir matroska mbox mikmod milter \
mime mmap mms mng modplug motif mozilla mp3 mp4 mpeg mpi reiserfs \
mplayer msn mtp musepack musicbrainz netcdf pcre pda pdf perl \
php pie plasma plotutils policykit portaudio posix kdepim openssl \
postscript ppds python qmail-spp raw rss sasl scanner printsupport \
semantic-desktop sharedmem shorten custom-optimization upower simplexml \
sip smartcard smp sndfile soap speex spell ssl subversion svg \
syslog szip tcpd theora threads tidy tiff timidity truetype \
udev udisks unicode usb v4l png vcd vnc vorbis wavpack wddx openal \
wifi wxwidgets x264 xattr xcb xcomposite xface xft xine gnome-keyring \
xinerama xinetd xmlrpc xmp xmpp xscreensaver xv xvid zlib gnome \
networkmanager video opengl ogg acpi libcanberra vlc gtk alsa pic fax \
fuse rar zip unzip mate opencl cups sensors vala ruby svc pcre16 \
sqlite kde -pulseaudio -systemd"
MAKEOPTS="-j9"
LINGUAS="it"
L10N="it"
INPUT_DEVICES="keyboard mouse evdev"
VIDEO_CARDS="nvidia"
ACCEPT_LICENSE="*"

#PYTHON_TARGETS="python2_7 python3_4 python3_5"
#PYTHON_SINGLE_TARGET="python2_7 python3_4 python3_5"
sandro@ci4771ht ~ $
__________________________________________________________________
May be due about my declared LDFLAGS ?