The issue present in several versions of thunar. Currently using xfce-base/thunar-1.2.3 The checkbox "Enable Volume Management" is available independently on status of xfce-extra/thunar-volman. If this checkbox is set, the link Configure becomes active. Clicking on this link (whichs availability depends only on checkbox status) if xfce-extra/thunar-volman is not installed displays error. Reproducible: Always Steps to Reproduce: 1. Install xfce-base/thunar (if not installed); 2. Uninstall xfce-extra/thunar-volman if installed (or do nothing); 3. Start thunar and goto Preferencies in Edit menu; 4. Enable Volume management. Actual Results: Link Config Volume Managenent becomes available. Expected Results: Without installed xfce-base/thunar the link should be inactive independently on status of Volume Management checkbox. Possibly, the checkbox itself should be fixed in disabled state. Gentoo-side suggestion: move volman functionality from separate package to thunar's use-flag. Because of volman configuration menu is available from general configuration menu of XFce4 (missing thunar) may be it will be the best solution to remove this functionality from thunar's menu: thinking if volman is installed, it's enabled (configuration is available from main menu), if it is not installed: nothing presents, neither in general configuration menu, nor in thunar's menu (volume management is disabled). $ emerge --info Portage 2.1.10.11 (default/linux/x86/10.0, gcc-4.5.3, glibc-2.12.2-r0, 2.6.39-gentoo-r3 i686) ================================================================= System uname: Linux-2.6.39-gentoo-r3-i686-Intel-R-_Pentium-R-_4_CPU_3.00GHz-with-gentoo-2.0.3 Timestamp of tree: Mon, 24 Oct 2011 00:45:01 +0000 app-shells/bash: 4.1_p9 dev-java/java-config: 2.1.11-r3 dev-lang/python: 2.7.2-r3, 3.1.4-r3 dev-util/cmake: 2.8.4-r1 dev-util/pkgconfig: 0.26 sys-apps/baselayout: 2.0.3 sys-apps/openrc: 0.8.3-r1 sys-apps/sandbox: 2.4 sys-devel/autoconf: 2.13, 2.68 sys-devel/automake: 1.10.3, 1.11.1 sys-devel/binutils: 2.20.1-r1 sys-devel/gcc: 4.5.3-r1 sys-devel/gcc-config: 1.4.1-r1 sys-devel/libtool: 2.4-r1 sys-devel/make: 3.82-r1 sys-kernel/linux-headers: 2.6.39 (virtual/os-headers) sys-libs/glibc: 2.12.2 Repositories: gentoo location: /usr/portage sync: rsync://mirror.yandex.ru/gentoo-portage/ priority: -1000 local-portage-tree location: /usr/local/portage-ftn masters: gentoo priority: 0 ACCEPT_KEYWORDS="x86" ACCEPT_LICENSE="* -@EULA" ACCEPT_PROPERTIES="*" ALSA_CARDS="intel8x0" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="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" ARCH="x86" AUTOCLEAN="yes" CALLIGRA_FEATURES="kexi words flow plan stage tables krita karbon braindump" CAMERAS="ptp2" CBUILD="i686-pc-linux-gnu" CFLAGS="-O2 -march=native -pipe" CHOST="i686-pc-linux-gnu" CLEAN_DELAY="5" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" COLLISION_IGNORE="/lib/modules" COLORTERM="Terminal" CONFIG_PROTECT="/etc /etc/env.d/50glib2 /usr/share/gnupg/qualified.txt /var/bind" CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/php/apache2-php5.3/ext-active/ /etc/php/cgi-php5.3/ext-active/ /etc/php/cli-php5.3/ext-active/ /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 -march=native -pipe" C_INCLUDE_PATH="/usr/lib/oracle/10.2.0.3/client/include" DBUS_SESSION_BUS_ADDRESS="unix:abstract=/tmp/dbus-aU6DfYOkRU,guid=403d693253fe3c41dd43c9a200000064" DESKTOP_SESSION="xfce" DISPLAY=":0.0" DISTDIR="/var/distfiles" EDITOR="/usr/bin/vim" ELIBC="glibc" EMERGE_DEFAULT_OPTS="--ask --verbose --autounmask=n" EMERGE_WARNING_DELAY="10" EPREFIX="" EROOT="/" FCFLAGS="" FEATURES="assume-digests binpkg-logs buildsyspkg distlocks ebuild-locks fixlafiles fixpackages news parallel-fetch protect-owned sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch" FETCHCOMMAND="/usr/bin/wget -t 5 -T 60 --passive-ftp --proxy-user=user --proxy-password=secret -O "${DISTDIR}/${FILE}" "${URI}"" FETCHCOMMAND_RSYNC="rsync -avP "${URI}" "${DISTDIR}/${FILE}"" FETCHCOMMAND_SFTP="bash -c "x=\${2#sftp://} ; host=\${x%%/*} ; port=\${host##*:} ; host=\${host%:*} ; [[ \${host} = \${port} ]] && port=22 ; exec sftp -P \${port} \"\${host}:/\${x#*/}\" \"\$1\"" sftp "${DISTDIR}/${FILE}" "${URI}"" FETCHCOMMAND_SSH="bash -c "x=\${2#ssh://} ; host=\${x%%/*} ; port=\${host##*:} ; host=\${host%:*} ; [[ \${host} = \${port} ]] && port=22 ; exec rsync --rsh=\"ssh -p\${port}\" -avP \"\${host}:/\${x#*/}\" \"\$1\"" rsync "${DISTDIR}/${FILE}" "${URI}"" FFLAGS="" GCC_SPECS="" GDK_USE_XFT="1" GENTOO_MIRRORS="http://mirror.yandex.ru/gentoo-distfiles/ ftp://mirror.yandex.ru/gentoo-distfiles/ http://ftp.chg.ru/pub/Linux/distributions/gentoo/ ftp://ftp.chg.ru/pub/Linux/distributions/gentoo/ http://ftp.corbina.net/pub/Linux/gentoo/ ftp://ftp.corbina.net/pub/Linux/gentoo/" GLADE_CATALOG_PATH=":" GLADE_MODULE_PATH=":" GLADE_PIXMAP_PATH=":" GPG_AGENT_INFO="/tmp/gpg-YkaDvR/S.gpg-agent:1832:1" 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 ubx" GRUB_PLATFORMS="" GSETTINGS_BACKEND="gconf" G_BROKEN_FILENAMES="1" G_FILENAME_ENCODING="KOI8-R" HG="/usr/bin/hg" HOME="/home/ftn" INFOPATH="/usr/share/info:/usr/share/binutils-data/i686-pc-linux-gnu/2.20.1/info:/usr/share/gcc-data/i686-pc-linux-gnu/4.5.3/info" INPUT_DEVICES="keyboard mouse" JAVAC="/etc/java-config-2/current-system-vm/bin/javac" JAVA_HOME="/etc/java-config-2/current-system-vm" JDK_HOME="/etc/java-config-2/current-system-vm" KERNEL="linux" LANG="ru_RU.KOI8-R" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LC_ALL="" LC_NUMERIC="C" LDFLAGS="-Wl,-O1 -Wl,--as-needed" LESS="-R -M --shift 5" LESSOPEN="|lesspipe %s" LIBGLADE_MODULE_PATH=":/usr/lib/libglade/2.0" LINGUAS="ru" LOGNAME="ftn" LS_COLORS="rs=0:di=01;34:ln=01;36:mh=00:pi=40;33:so=01;35:do=01;35:bd=40;33;01:cd=40;33;01:or=01;05;37;41:mi=01;05;37;41:su=37;41:sg=30;43:ca=30;41:tw=30;42:ow=34;42:st=37;44:ex=01;32:*.tar=01;31:*.tgz=01;31:*.arj=01;31:*.taz=01;31:*.lzh=01;31:*.lzma=01;31:*.tlz=01;31:*.txz=01;31:*.zip=01;31:*.z=01;31:*.Z=01;31:*.dz=01;31:*.gz=01;31:*.lz=01;31:*.xz=01;31:*.bz2=01;31:*.bz=01;31:*.tbz=01;31:*.tbz2=01;31:*.tz=01;31:*.deb=01;31:*.rpm=01;31:*.jar=01;31:*.rar=01;31:*.ace=01;31:*.zoo=01;31:*.cpio=01;31:*.7z=01;31:*.rz=01;31:*.jpg=01;35:*.jpeg=01;35:*.gif=01;35:*.bmp=01;35:*.pbm=01;35:*.pgm=01;35:*.ppm=01;35:*.tga=01;35:*.xbm=01;35:*.xpm=01;35:*.tif=01;35:*.tiff=01;35:*.png=01;35:*.svg=01;35:*.svgz=01;35:*.mng=01;35:*.pcx=01;35:*.mov=01;35:*.mpg=01;35:*.mpeg=01;35:*.m2v=01;35:*.mkv=01;35:*.ogm=01;35:*.mp4=01;35:*.m4v=01;35:*.mp4v=01;35:*.vob=01;35:*.qt=01;35:*.nuv=01;35:*.wmv=01;35:*.asf=01;35:*.rm=01;35:*.rmvb=01;35:*.flc=01;35:*.avi=01;35:*.fli=01;35:*.flv=01;35:*.gl=01;35:*.dl=01;35:*.xcf=01;35:*.xwd=01;35:*.yuv=01;35:*.cgm=01;35:*.emf=01;35:*.axv=01;35:*.anx=01;35:*.ogv=01;35:*.ogx=01;35:*.pdf=00;32:*.ps=00;32:*.txt=00;32:*.patch=00;32:*.diff=00;32:*.log=00;32:*.tex=00;32:*.doc=00;32:*.aac=00;36:*.au=00;36:*.flac=00;36:*.mid=00;36:*.midi=00;36:*.mka=00;36:*.mp3=00;36:*.mpc=00;36:*.ogg=00;36:*.ra=00;36:*.wav=00;36:*.axa=00;36:*.oga=00;36:*.spx=00;36:*.xspf=00;36:" MAIL="/var/mail/ftn" MAKEOPTS="-j2" MANPATH="/etc/java-config-2/current-system-vm/man:/usr/local/share/man:/usr/share/man:/usr/share/binutils-data/i686-pc-linux-gnu/2.20.1/man:/usr/share/gcc-data/i686-pc-linux-gnu/4.5.3/man:/etc/java-config/system-vm/man/:/usr/lib/php5.3/man/" NETBEANS="apisupport cnd groovy gsf harness ide identity j2ee java mobility nb php profiler soa visualweb webcommon websvccommon xml" NLS_LANG="russian_cis.cl8iso8859p5" OPENGL_PROFILE="xorg-x11" ORACLE_HOME="/usr/lib/oracle/10.2.0.3/client" PAGER="/usr/bin/less" PATH="/usr/local/bin:/usr/bin:/bin:/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/4.1.1:/usr/i686-pc-linux-gnu/gcc-bin/4.5.3:~/bin" PHP_TARGETS="php5-3" PKGDIR="/usr/portage/packages" PORTAGE_ARCHLIST="ppc sparc64-freebsd ppc-openbsd x86-openbsd ppc64 x86-winnt x86-fbsd ppc-aix alpha arm x86-freebsd s390 amd64 arm-linux x86-macos x64-openbsd ia64-hpux hppa x86-netbsd x86-cygwin amd64-linux ia64-linux x86 sparc-solaris x64-freebsd sparc64-solaris x86-linux x64-macos sparc m68k-mint ia64 mips ppc-macos x86-interix hppa-hpux amd64-fbsd x64-solaris mips-irix m68k sh x86-solaris sparc-fbsd" PORTAGE_BINHOST_CHUNKSIZE="3000" PORTAGE_BIN_PATH="/usr/lib/portage/bin" PORTAGE_COMPRESS_EXCLUDE_SUFFIXES="css gif htm[l]? jp[e]?g js pdf png" PORTAGE_CONFIGROOT="/" PORTAGE_DEBUG="0" PORTAGE_DEPCACHEDIR="/var/cache/edb/dep" PORTAGE_ELOG_CLASSES="log warn error" PORTAGE_ELOG_MAILFROM="portage@localhost" PORTAGE_ELOG_MAILSUBJECT="[portage] ebuild log for ${PACKAGE} on ${HOST}" PORTAGE_ELOG_MAILURI="root" PORTAGE_ELOG_SYSTEM="save_summary echo" PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS="5" PORTAGE_FETCH_RESUME_MIN_SIZE="350K" PORTAGE_GID="250" PORTAGE_GPG_SIGNING_COMMAND="gpg --sign --clearsign --yes --default-key "${PORTAGE_GPG_KEY}" --homedir "${PORTAGE_GPG_DIR}" "${FILE}"" PORTAGE_INST_GID="0" PORTAGE_INST_UID="0" PORTAGE_NICENESS="13" PORTAGE_PYM_PATH="/usr/lib/portage/pym" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --stats --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages" PORTAGE_RSYNC_RETRIES="-1" PORTAGE_SANDBOX_COMPAT_LEVEL="16" PORTAGE_SYNC_STALE="30" PORTAGE_TMPDIR="/var/tmp" PORTAGE_VERBOSE="1" PORTAGE_WORKDIR_MODE="0700" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage-ftn" PRELINK_PATH_MASK="/usr/lib/libfreebl3.so:/usr/lib/libnssdbm3.so:/usr/lib/libsoftokn3.so" PROFILE_ONLY_VARIABLES="ARCH ELIBC KERNEL USERLAND" PWD="/home/ftn/work" PYTHONDONTWRITEBYTECODE="1" RESUMECOMMAND="/usr/bin/wget -c -t 5 -T 60 --passive-ftp --proxy-user=user --proxy-password=secret -O "${DISTDIR}/${FILE}" "${URI}"" RESUMECOMMAND_RSYNC="rsync -avP "${URI}" "${DISTDIR}/${FILE}"" RESUMECOMMAND_SSH="bash -c "x=\${2#ssh://} ; host=\${x%%/*} ; port=\${host##*:} ; host=\${host%:*} ; [[ \${host} = \${port} ]] && port=22 ; exec rsync --rsh=\"ssh -p\${port}\" -avP \"\${host}:/\${x#*/}\" \"\$1\"" rsync "${DISTDIR}/${FILE}" "${URI}"" ROOT="/" ROOTPATH="/opt/bin:/usr/i686-pc-linux-gnu/gcc-bin/4.1.1:/usr/i686-pc-linux-gnu/gcc-bin/4.5.3" RPMDIR="/usr/portage/rpm" RUBY_TARGETS="ruby18" SESSION_MANAGER="/tmp/.ICE-unix/1841" SHELL="/bin/bash" SHLVL="3" SSH_AGENT_PID="1832" SSH_AUTH_SOCK="/tmp/gpg-yztV7r/S.gpg-agent.ssh" SUPPORT_ALSA="1" SYNC="rsync://mirror.yandex.ru/gentoo-portage/" TERM="xterm" TNS_ADMIN="/etc/oracle/" USE="X a52 ac3 acl alsa avi berkdb bold bzip2 cdr cli cracklib crypt cups cxx dbus djvu dri dvd flac fortran gdbm gif gtk iconv jpeg jpeg2k modules mp3 mudflap ncurses nls nptl nptlonly ogg openmp pam pcre pdf png pppd qt3support readline session ssl sysfs tcpd tiff unicode utf8 vorbis x86 xcb xorg xulrunner zlib" ALSA_CARDS="intel8x0" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug file hooks iec958 ioplug ladspa lfloat linear meter mmap_emul mulaw multi null plug rate route share shm softvol" APACHE2_MODULES="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 stage tables krita karbon braindump" CAMERAS="ptp2" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" 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 ubx" INPUT_DEVICES="keyboard mouse" KERNEL="linux" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LINGUAS="ru" PHP_TARGETS="php5-3" RUBY_TARGETS="ruby18" USERLAND="GNU" VIDEO_CARDS="sis" 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" USER="ftn" USERLAND="GNU" USE_EXPAND="ALSA_CARDS ALSA_PCM_PLUGINS APACHE2_MODULES APACHE2_MPMS CALLIGRA_FEATURES CAMERAS COLLECTD_PLUGINS CROSSCOMPILE_OPTS DRACUT_MODULES DVB_CARDS ELIBC FCDSL_CARDS FOO2ZJS_DEVICES FRITZCAPI_CARDS GPSD_PROTOCOLS GRUB_PLATFORMS INPUT_DEVICES KERNEL LCD_DEVICES LINGUAS LIRC_DEVICES MISDN_CARDS NETBEANS_MODULES NGINX_MODULES_HTTP NGINX_MODULES_MAIL OFED_DRIVERS PHP_TARGETS QEMU_SOFTMMU_TARGETS QEMU_USER_TARGETS RUBY_TARGETS SANE_BACKENDS USERLAND VIDEO_CARDS XFCE_PLUGINS XTABLES_ADDONS" USE_EXPAND_HIDDEN="CROSSCOMPILE_OPTS ELIBC KERNEL USERLAND" USE_ORDER="env:pkg:conf:defaults:pkginternal:repo:env.d" VIDEO_CARDS="sis" WINDOWID="56624843" WWW_HOME="www.ya.ru" XAUTHORITY="/home/ftn/.Xauthority" XDG_CONFIG_DIRS="/etc/xdg:/etc/xdg" XDG_DATA_DIRS="/usr/local/share:/usr/share:/usr/share" XDG_MENU_PREFIX="xfce-" XSESSION="Xfce4" 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" _="/usr/bin/emerge"
nah, pure runtime -only dependencies don't belong in as an USE flag. it's a separate package, not part of Thunar's release cycle. you simply 'emerge thunar-volman' if you want it. if you wanted the error message to be more suggestive, like "Please, install thunar-volman." I suggest you move this to http://bugzilla.xfce.org/ instead so Thunar developers can change it.
Suggestion was reported to the upstream: https://bugzilla.xfce.org/show_bug.cgi?id=8071
Following upstream bug resolution -> https://bugzilla.xfce.org/show_bug.cgi?id=8071#c2 -> WONTFIX -> INVALID
