These are the packages that would be merged, in order:

Calculating dependencies  .... done!
[ebuild  N     ] sys-libs/ncurses-6.1_p20181020:0/6::gentoo  USE="cxx gpm (split-usr) (tinfo) unicode -ada -debug -doc -minimal -profile -static-libs -test -threads -trace" ABI_X86="32 (64) (-x32)" 0 KiB

Total: 1 package (1 new), Size of downloads: 0 KiB

>>> Verifying ebuild manifests


>>> Emerging (1 of 1) sys-libs/ncurses-6.1_p20181020::gentoo
 * ncurses-6.1.tar.gz BLAKE2B SHA512 size ;-) ...                        [ ok ]
 * ncurses-6.1-20181020-patch.sh.bz2 BLAKE2B SHA512 size ;-) ...         [ ok ]
>>> Unpacking source...
>>> Unpacking ncurses-6.1.tar.gz to /var/tmp/portage/sys-libs/ncurses-6.1_p20181020/work
>>> Unpacking ncurses-6.1-20181020-patch.sh.bz2 to /var/tmp/portage/sys-libs/ncurses-6.1_p20181020/work
>>> Source unpacked in /var/tmp/portage/sys-libs/ncurses-6.1_p20181020/work
>>> Preparing source in /var/tmp/portage/sys-libs/ncurses-6.1_p20181020/work/ncurses-6.1 ...
 * Applying ncurses-6.1-20181020-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_p20181020/work/ncurses-6.1 ...
 * econf: updating ncurses-6.1/config.sub with /usr/share/gnuconfig/config.sub
 * econf: updating ncurses-6.1/config.guess with /usr/share/gnuconfig/config.guess
/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/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 --with-gpm=libgpm.so.1 --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 (Wed Nov  6 21:46:13 SAST 2019)
checking for package version... 6.1
checking for package patch date... 20181020
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_p20181020/work/cross/config.log
 * ERROR: sys-libs/ncurses-6.1_p20181020::gentoo failed (configure phase):
 *   econf failed
 *
 * Call stack:
 *               ebuild.sh, line  125:  Called src_configure
 *             environment, line 2130:  Called do_configure 'cross' '--without-shared' '--with-normal'
 *             environment, line  574:  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' '--with-gpm=libgpm.so.1' '--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  681:  Called __helpers_die 'econf failed'
 *   isolated-functions.sh, line  112:  Called die
 * The specific snippet of code:
 *   		die "$@"
 *
 * If you need support, post the output of `emerge --info '=sys-libs/ncurses-6.1_p20181020::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sys-libs/ncurses-6.1_p20181020::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/temp/environment'.
 * Working directory: '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/work/cross'
 * S: '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/work/ncurses-6.1'

>>> Failed to emerge sys-libs/ncurses-6.1_p20181020, Log file:

>>>  '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/temp/build.log'
 * Messages for package sys-libs/ncurses-6.1_p20181020:
 * ERROR: sys-libs/ncurses-6.1_p20181020::gentoo failed (configure phase):
 *   econf failed
 *
 * Call stack:
 *               ebuild.sh, line  125:  Called src_configure
 *             environment, line 2130:  Called do_configure 'cross' '--without-shared' '--with-normal'
 *             environment, line  574:  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' '--with-gpm=libgpm.so.1' '--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  681:  Called __helpers_die 'econf failed'
 *   isolated-functions.sh, line  112:  Called die
 * The specific snippet of code:
 *   		die "$@"
 *
 * If you need support, post the output of `emerge --info '=sys-libs/ncurses-6.1_p20181020::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=sys-libs/ncurses-6.1_p20181020::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/temp/environment'.
 * Working directory: '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/work/cross'
 * S: '/var/tmp/portage/sys-libs/ncurses-6.1_p20181020/work/ncurses-6.1'