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

Calculating dependencies... done!
[ebuild  N     ] dev-libs/nss-3.14  USE="utils" 0 kB

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

Would you like to merge these packages? [Yes/No]

>>> Verifying ebuild manifests

>>> Emerging (1 of 1) dev-libs/nss-3.14
 * nss-3.14.tar.gz SHA256 SHA512 WHIRLPOOL size ;-) ...                                                                                       [ ok ]
 * nss-3.14-add_spi+cacerts_ca_certs.patch SHA256 SHA512 WHIRLPOOL size ;-) ...                                                               [ ok ]
 * nss-3.13.3_pem.support SHA256 SHA512 WHIRLPOOL size ;-) ...                                                                                [ ok ]
>>> Unpacking source...
>>> Unpacking nss-3.14.tar.gz to /var/tmp/portage/dev-libs/nss-3.14/work
>>> Unpacking nss-3.14-add_spi+cacerts_ca_certs.patch to /var/tmp/portage/dev-libs/nss-3.14/work
unpack nss-3.14-add_spi+cacerts_ca_certs.patch: file format not recognized. Ignoring.
>>> Unpacking nss-3.13.3_pem.support to /var/tmp/portage/dev-libs/nss-3.14/work
unpack nss-3.13.3_pem.support: file format not recognized. Ignoring.
>>> Source unpacked in /var/tmp/portage/dev-libs/nss-3.14/work
>>> Preparing source in /var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14 ...
 * Applying nss-3.13-gentoo-fixup.patch ...                                                                                                   [ ok ]
 * Applying nss-3.12.6-gentoo-fixup-warnings.patch ...                                                                                        [ ok ]
 * Applying nss-3.14-add_spi+cacerts_ca_certs.patch ...                                                                                       [ ok ]
 * Applying nss-3.13.3_pem.support ...                                                                                                        [ ok ]
 * Applying nss-3.13.5-x32.patch ...                                                                                                          [ ok ]
 * Applying nss-3.13.1-solaris-gcc.patch ...                                                                                                  [ ok ]
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14 ...
>>> Source configured.
>>> Compiling source in /var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14 ...
make -j5 -j1 CC=x86_64-pc-linux-gnu-gcc
cd nsinstall; make export
make[1]: Entering directory `/var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14/mozilla/security/coreconf/nsinstall'
make[1]: Nothing to be done for `export'.
make[1]: Leaving directory `/var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14/mozilla/security/coreconf/nsinstall'
../coreconf/nsinstall/Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/nsinstall -t -m 775 Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/nano Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/vnc Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/rdesktop Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/conky Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/chrome Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/firefox ../dist/Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/bin
make: ../coreconf/nsinstall/Linux3.6_x86_64_x86_64-pc-linux-gnu-gcc_glibc_PTH_64_OPT.OBJ/nsinstall: Command not found
make: *** [libs] Error 127
emake failed
 * ERROR: dev-libs/nss-3.14 failed (compile phase):
 *   coreconf make failed
 *
 * Call stack:
 *     ebuild.sh, line  93:  Called src_compile
 *   environment, line 2387:  Called die
 * The specific snippet of code:
 *       emake -j1 CC="$(tc-getCC)" || die "coreconf make failed";
 *
 * If you need support, post the output of `emerge --info '=dev-libs/nss-3.14'`,
 * the complete build log and the output of `emerge -pqv '=dev-libs/nss-3.14'`.
 * The complete build log is located at '/var/tmp/portage/dev-libs/nss-3.14/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-libs/nss-3.14/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14/mozilla/security/coreconf'
 * S: '/var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14'

>>> Failed to emerge dev-libs/nss-3.14, Log file:

>>>  '/var/tmp/portage/dev-libs/nss-3.14/temp/build.log'

 * Messages for package dev-libs/nss-3.14:

 * ERROR: dev-libs/nss-3.14 failed (compile phase):
 *   coreconf make failed
 *
 * Call stack:
 *     ebuild.sh, line  93:  Called src_compile
 *   environment, line 2387:  Called die
 * The specific snippet of code:
 *       emake -j1 CC="$(tc-getCC)" || die "coreconf make failed";
 *
 * If you need support, post the output of `emerge --info '=dev-libs/nss-3.14'`,
 * the complete build log and the output of `emerge -pqv '=dev-libs/nss-3.14'`.
 * The complete build log is located at '/var/tmp/portage/dev-libs/nss-3.14/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-libs/nss-3.14/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14/mozilla/security/coreconf'
 * S: '/var/tmp/portage/dev-libs/nss-3.14/work/nss-3.14'