* Package:    dev-python/msgpack-0.5.6
 * Repository: gentoo
 * Maintainer: lluixhi@gmail.com proxy-maint@gentoo.org,python@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux native-extensions python_targets_python2_7 python_targets_python3_5 userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking msgpack-0.5.6.tar.gz to /var/tmp/portage/dev-python/msgpack-0.5.6/work
>>> Source unpacked in /var/tmp/portage/dev-python/msgpack-0.5.6/work
>>> Preparing source in /var/tmp/portage/dev-python/msgpack-0.5.6/work/msgpack-0.5.6 ...
sed: can't read requirements.txt: No such file or directory
 * ERROR: dev-python/msgpack-0.5.6::gentoo failed (prepare phase):
 *   (no error message)
 * 
 * Call stack:
 *     ebuild.sh, line  124:  Called src_prepare
 *   environment, line 2621:  Called distutils-r1_src_prepare
 *   environment, line  866:  Called python_prepare_all
 *   environment, line 2454:  Called die
 * The specific snippet of code:
 *       sed -i '/^Cython/d' requirements.txt || die;
 * 
 * If you need support, post the output of `emerge --info '=dev-python/msgpack-0.5.6::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-python/msgpack-0.5.6::gentoo'`.
 * The complete build log is located at '/var/log/portage/dev-python:msgpack-0.5.6:20180310-084556.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/dev-python/msgpack-0.5.6/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/dev-python/msgpack-0.5.6/temp/environment'.
 * Working directory: '/var/tmp/portage/dev-python/msgpack-0.5.6/work/msgpack-0.5.6'
 * S: '/var/tmp/portage/dev-python/msgpack-0.5.6/work/msgpack-0.5.6'