I recently updated dev-python/rpy to version 2.5.6. When I attempt to import the rpy2.robjects submodule I receive an error. Apparently the system now requires singledispatch as a base requirement. This is for dev-lang/python-2.7.7 Reproducible: Always Steps to Reproduce: 1. Install dev-python/rpy-2.5.6 on dev-lang/python-2.7.7 2. Start python and call the following import: "import rpy2.robjects" The call "import rpy2" does not trigger this error. Actual Results: Python 2.7.7 (default, Sep 16 2014, 14:21:39) [GCC 4.7.3] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import rpy2.robjects Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/lib64/python2.7/site-packages/rpy2/robjects/__init__.py", line 18, in <module> from rpy2.robjects.robject import RObjectMixin, RObject File "/usr/lib64/python2.7/site-packages/rpy2/robjects/robject.py", line 7, in <module> from . import conversion File "/usr/lib64/python2.7/site-packages/rpy2/robjects/conversion.py", line 13, in <module> from singledispatch import singledispatch ImportError: No module named singledispatch Installation of virtual/python-singledispatch and dev-python/singledispatch fixes the problem. I recommend that the ebuild for dev-python/rpy be amended to include that as a requirement when the python target is less than 3.4 which includes singledispatch as a core component. Portage 2.2.14 (python 2.7.7-final-0, default/linux/amd64/13.0, gcc-4.8.4, glibc-2.19-r1, 3.18.4 x86_64) ================================================================= System uname: Linux-3.18.4-x86_64-Intel-R-_Core-TM-_i7-4600U_CPU_@_2.10GHz-with-gentoo-2.2 KiB Mem: 7858504 total, 4340904 free KiB Swap: 15637500 total, 15637500 free Timestamp of tree: Mon, 06 Apr 2015 14:00:01 +0000 ld GNU ld (Gentoo 2.24 p1.4) 2.24 app-shells/bash: 4.2_p53 dev-java/java-config: 2.2.0 dev-lang/perl: 5.18.2-r1 dev-lang/python: 2.7.7, 3.3.5-r1 dev-util/cmake: 2.8.12.2 dev-util/pkgconfig: 0.28-r1 sys-apps/baselayout: 2.2 sys-apps/openrc: 0.13.11 sys-apps/sandbox: 2.6-r1 sys-devel/autoconf: 2.13, 2.69 sys-devel/automake: 1.11.6, 1.13.4 sys-devel/binutils: 2.24-r3 sys-devel/gcc: 4.7.3-r1, 4.8.4 sys-devel/gcc-config: 1.7.3 sys-devel/libtool: 2.4.6 sys-devel/make: 4.1-r1 sys-kernel/linux-headers: 3.13 (virtual/os-headers) sys-libs/glibc: 2.19-r1 Repositories: gentoo science java eyolfson ACCEPT_KEYWORDS="amd64" ACCEPT_LICENSE="* -@EULA" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-O2 -pipe -march=native" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/share/config /usr/share/gnupg/qualified.txt /var/lib/hsqldb" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo /etc/texmf/language.dat.d /etc/texmf/language.def.d /etc/texmf/updmap.d /etc/texmf/web2c" CXXFLAGS="-O2 -pipe -march=native" DISTDIR="/usr/portage/distfiles" FCFLAGS="-O2 -pipe" FEATURES="assume-digests binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles merge-sync news parallel-fetch preserve-libs protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync" FFLAGS="-O2 -pipe" GENTOO_MIRRORS="http://distfiles.gentoo.org" LANG="en_US.utf8" LDFLAGS="-Wl,-O1 -Wl,--as-needed" MAKEOPTS="-j4" PKGDIR="/usr/portage/packages" PORTAGE_CONFIGROOT="/" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/var/lib/layman/science /var/lib/layman/java /var/lib/layman/eyolfson" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="X a52 aac acl acpi alsa amd64 avx avx2 bash-completion berkdb bidi bindist bzip2 canna cdr cjk cli consolekit cracklib crypt cups curl curlwrappers cvs cxx dbus dga dri dts dv dvb dvd dvdr dvdread emacs encode exif expat ffmpeg fftw flac fontconfig fortran gdbm gif gimp ginac gnuplot gpm graphviz gsl gtk hddtemp iconv ieee1394 ipv6 jaber java jpeg jpeg2k libav libcaca lm_sensors lzma lzo mad mikmod mmx mmxext modules mpeg mplayer multilib ncurses nls nptl nsplugin ogg openal opengl openmp pam pcmcia pcre perl png portaudio posix ppds python raw readline sdl session spell sse sse2 sse3 sse4_1 ssl ssse3 tcpd theora threads truetype udev unicode usb v4l v4l2 vcd vorbis wavpack xft xosd zlib" ABI_X86="64" ALSA_CARDS="snd-hda-intel hda-intel" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="kexi words flow plan sheets stage tables krita karbon braindump author" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="mmx mmxext sse sse2" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev keyboard mouse synaptics" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php5-5" PYTHON_SINGLE_TARGET="python2_7" PYTHON_TARGETS="python2_7 python3_3" RUBY_TARGETS="ruby19 ruby20" USERLAND="GNU" VIDEO_CARDS="intel i965" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account" Unset: CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS, USE_PYTHON
28 Apr 2015; Ian Delaney <idella4@gentoo.org> rpy-2.5.6.ebuild: add missing dep, fixes Bug #546926
