(chroot) livecd / # cat /var/tmp/portage/sys-libs/ncurses-6.1_p20190609/temp/build.log
 * Package:    sys-libs/ncurses-6.1_p20190609
 * Repository: gentoo
 * Maintainer: base-system@gentoo.org
 * USE:        abi_x86_64 amd64 cxx elibc_glibc kernel_linux split-usr tinfo unicode userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking ncurses-6.1.tar.gz to /var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work
>>> Unpacking ncurses-6.1-20190609-patch.sh.bz2 to /var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work
>>> Source unpacked in /var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work
>>> Preparing source in /var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work/ncurses-6.1 ...
 * Applying ncurses-6.1-20190609-patch.sh ...                                                                                                      [ ok ]
 * Applying ncurses-5.7-nongnu.patch ...                                                                                                           [ ok ]
 * Applying ncurses-6.0-rxvt-unicode-9.15.patch ...                                                                                                [ ok ]
 * Applying ncurses-6.0-pkg-config.patch ...                                                                                                       [ ok ]
 * Applying ncurses-5.9-gcc-5.patch ...                                                                                                            [ ok ]
 * Applying ncurses-6.0-ticlib.patch ...                                                                                                           [ ok ]
 * Applying ncurses-6.0-cppflags-cross.patch ...                                                                                                   [ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work/ncurses-6.1 ...
 * econf: updating ncurses-6.1/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating ncurses-6.1/config.sub with /usr/share/gnuconfig/config.sub
/var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work/ncurses-6.1/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 --with-terminfo-dirs=/etc/terminfo:/usr/share/terminfo --enable-pc-files --with-pkg-config-libdir=/usr/lib64/pkgconfig --with-shared --without-hashed-db --without-ada --with-cxx --with-cxx-binding --with-cxx-shared --without-debug --without-profile --without-gpm --disable-term-driver --disable-termcap --enable-symlinks --with-rcs-ids --with-manpage-format=normal --enable-const --enable-colorfgbg --enable-hard-tabs --enable-echo --enable-warnings --without-assertions --enable-leaks --without-expanded --with-macros --with-progs --without-tests --without-trace --with-termlib --disable-stripping --disable-widec --without-pthread --without-reentrant --includedir=/usr/include/cross --without-shared --with-normal
checking for egrep... grep -E
Configuring NCURSES 6.1 ABI 6 (Fri Sep 27 15:05:34 -00 2019)
checking for package version... 6.1
checking for package patch date... 20190609
checking build system type... x86_64-pc-linux-gnu
checking host system type... x86_64-pc-linux-gnu
checking target system type... x86_64-pc-linux-gnu
Configuring for linux-gnu
checking for prefix... /usr
checking for x86_64-pc-linux-gnu-gcc... x86_64-pc-linux-gnu-gcc
checking for C compiler default output... configure: error: C compiler cannot create executables

!!! Please attach the following file when seeking support:
!!! /var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work/cross/config.log
 * ERROR: sys-libs/ncurses-6.1_p20190609::gentoo failed (configure phase):
 *   econf failed
 *
 * Call stack:
 *               ebuild.sh, line  125:  Called src_configure
 *             environment, line 2120:  Called do_configure 'cross' '--without-shared' '--with-normal'
 *             environment, line  564:  Called econf '--with-terminfo-dirs=/etc/terminfo:/usr/share/terminfo' '--enable-pc-files' '--with-pkg-config-libdir=/usr/lib64/pkgconfig' '--with-shared' '--without-hashed-db' '--without-ada' '--with-cxx' '--with-cxx-binding' '--with-cxx-shared' '--without-debug' '--without-profile' '--without-gpm' '--disable-term-driver' '--disable-termcap' '--enable-symlinks' '--with-rcs-ids' '--with-manpage-format=normal' '--enable-const' '--enable-colorfgbg' '--enable-hard-tabs' '--enable-echo' '--enable-warnings' '--without-assertions' '--enable-leaks' '--without-expanded' '--with-macros' '--with-progs' '--without-tests' '--without-trace' '--with-termlib' '--disable-stripping' '--disable-widec' '--without-pthread' '--without-reentrant' '--includedir=/usr/include/cross' '--without-shared' '--with-normal'
 *        phase-helpers.sh, line  718:  Called __helpers_die 'econf failed'
 *   isolated-functions.sh, line  119:  Called die
 * The specific snippet of code:
 *              die "$@"
 *
 * If you need support, post the output of `emerge --info '=sys-libs/ncurses-6.1_p20190609::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sys-libs/ncurses-6.1_p20190609::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/sys-libs/ncurses-6.1_p20190609/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-libs/ncurses-6.1_p20190609/temp/environment'.
 * Working directory: '/var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work/cross'
 * S: '/var/tmp/portage/sys-libs/ncurses-6.1_p20190609/work/ncurses-6.1'
(chroot) livecd / #