Could not find plugin

OS: Xubuntu 16.04

i cloned git repo and executed following commands:

git submodule update --init --recursive

cmake ./ -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_INSTALL_LIBDIR=lib -DCMAKE_INSTALL_SYSCONFDIR=/etc -DENABLE_WNCK=ON
-- Looking for RPMTools... - rpmbuild NOT FOUND
-- Found Vala: /usr/bin/valac  
-- checking for a minimum Vala version of 0.24
--   found Vala, version 0.30.1
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1") 
-- Checking for modules 'gtk+-3.0>=3.12;glib-2.0>=2.40;gio-2.0>=2.40;gio-unix-2.0>=2.40;gthread-2.0>=2.40;libpeas-1.0>=1.2;libpeas-gtk-1.0>=1.2;gmodule-2.0>=2.40'
--   Found gtk+-3.0, version 3.18.9
--   Found glib-2.0, version 2.48.0
--   Found gio-2.0, version 2.48.0
--   Found gio-unix-2.0, version 2.48.0
--   Found gthread-2.0, version 2.48.0
--   Found libpeas-1.0, version 1.16.0
--   Found libpeas-gtk-1.0, version 1.16.0
--   Found gmodule-2.0, version 2.48.0
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
-- Checking for module 'libwnck-3.0'
--   Found libwnck-3.0, version 3.14.1
-- Checking for modules 'x11;gdk-x11-3.0'
--   Found x11, version 1.6.3
--   Found gdk-x11-3.0, version 3.18.9
-- GSettings schemas will be installed locally.
-- GSettings schemas will be compiled.
-- GSettings schemas will be installed into /usr/share/glib-2.0/schemas/
-- GSettings schemas will be installed into /usr/share/glib-2.0/schemas/
-- GSettings schemas will be installed into /usr/share/glib-2.0/schemas/
-- GSettings schemas will be installed into /usr/share/glib-2.0/schemas/
-- GSettings schemas will be installed into /usr/share/glib-2.0/schemas/
-- Configuring done
-- Generating done
-- Build files have been written to: /home/juhwon/Downloads/vala-panel

make
Scanning dependencies of target i18n
[  0%] Built target i18n
[  1%] Generating misc.c;configurator.c;generic-config-dialog.c;css.c;dbusmenu/dbusmenu.c;icon-grid.c;menu-maker.c;panel-plugin.c;panel-toplevel.c;plugin-settings.c;/home/juhwon/Downloads/vala-panel/vapi/config.c;vala-panel.vapi;vala-panel.h
[  2%] Generating libvalapanel.gresource.c
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
Scanning dependencies of target valapanel
[  4%] Building C object lib/CMakeFiles/valapanel.dir/misc.c.o
[  5%] Building C object lib/CMakeFiles/valapanel.dir/configurator.c.o
[  6%] Building C object lib/CMakeFiles/valapanel.dir/generic-config-dialog.c.o
[  8%] Building C object lib/CMakeFiles/valapanel.dir/css.c.o
[  9%] Building C object lib/CMakeFiles/valapanel.dir/dbusmenu/dbusmenu.c.o
[ 10%] Building C object lib/CMakeFiles/valapanel.dir/icon-grid.c.o
[ 12%] Building C object lib/CMakeFiles/valapanel.dir/menu-maker.c.o
[ 13%] Building C object lib/CMakeFiles/valapanel.dir/panel-plugin.c.o
[ 14%] Building C object lib/CMakeFiles/valapanel.dir/panel-toplevel.c.o
[ 16%] Building C object lib/CMakeFiles/valapanel.dir/plugin-settings.c.o
[ 17%] Building C object lib/CMakeFiles/valapanel.dir/config.c.o
[ 18%] Building C object lib/CMakeFiles/valapanel.dir/libvalapanel.gresource.c.o
[ 20%] Linking C shared library libvalapanel.so
[ 20%] Built target valapanel
[ 21%] Generating application.c;runner.c
[ 22%] Generating vala-panel.gresource.c
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
Scanning dependencies of target vala-panel
[ 24%] Building C object app/CMakeFiles/vala-panel.dir/application.c.o
[ 25%] Building C object app/CMakeFiles/vala-panel.dir/runner.c.o
[ 26%] Building C object app/CMakeFiles/vala-panel.dir/vala-panel.gresource.c.o
[ 28%] Linking C executable vala-panel
[ 28%] Built target vala-panel
[ 29%] Generating kbled.c
[ 30%] Generating kbled.gresource.c
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
Scanning dependencies of target kbled
[ 32%] Building C object applets/core/kbled/CMakeFiles/kbled.dir/kbled.c.o
[ 33%] Building C object applets/core/kbled/CMakeFiles/kbled.dir/kbled.gresource.c.o
[ 34%] Linking C shared module libkbled.so
[ 34%] Built target kbled
[ 36%] Generating separator.c
Scanning dependencies of target separator
[ 37%] Building C object applets/core/separator/CMakeFiles/separator.dir/separator.c.o
[ 38%] Linking C shared module libseparator.so
[ 38%] Built target separator
[ 40%] Generating menumodel.c;menu-maker.c
[ 41%] Generating menumodel.gresource.c
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
Scanning dependencies of target menumodel
[ 42%] Building C object applets/core/menumodel/CMakeFiles/menumodel.dir/menumodel.c.o
[ 44%] Building C object applets/core/menumodel/CMakeFiles/menumodel.dir/menu-maker.c.o
[ 45%] Building C object applets/core/menumodel/CMakeFiles/menumodel.dir/menumodel.gresource.c.o
[ 46%] Linking C shared module libmenumodel.so
[ 46%] Built target menumodel
[ 48%] Generating clock.c
Scanning dependencies of target clock
[ 49%] Building C object applets/core/clock/CMakeFiles/clock.dir/clock.c.o
[ 50%] Linking C shared module libclock.so
[ 50%] Built target clock
[ 52%] Generating dirmenu.c
Scanning dependencies of target dirmenu
[ 53%] Building C object applets/core/dirmenu/CMakeFiles/dirmenu.dir/dirmenu.c.o
[ 54%] Linking C shared module libdirmenu.so
[ 54%] Built target dirmenu
[ 56%] Generating launchbar.c;launchbar-config.c;launchbar-button.c
[ 57%] Generating launchbar.gresource.c
XMLLINT not set and xmllint not found in path; skipping xml preprocessing.
Scanning dependencies of target launchbar
[ 58%] Building C object applets/core/launchbar/CMakeFiles/launchbar.dir/launchbar.c.o
[ 60%] Building C object applets/core/launchbar/CMakeFiles/launchbar.dir/launchbar-config.c.o
[ 61%] Building C object applets/core/launchbar/CMakeFiles/launchbar.dir/launchbar-button.c.o
[ 62%] Building C object applets/core/launchbar/CMakeFiles/launchbar.dir/launchbar.gresource.c.o
[ 64%] Linking C shared module liblaunchbar.so
[ 64%] Built target launchbar
[ 65%] Generating tasklist.c
Scanning dependencies of target tasklist
[ 66%] Building C object applets/wnck/tasklist/CMakeFiles/tasklist.dir/tasklist.c.o
[ 68%] Linking C shared module libtasklist.so
[ 68%] Built target tasklist
[ 69%] Generating pager.c
Scanning dependencies of target pager
[ 70%] Building C object applets/wnck/pager/CMakeFiles/pager.dir/pager.c.o
[ 72%] Linking C shared module libpager.so
[ 72%] Built target pager
[ 73%] Generating deskno.c
Scanning dependencies of target deskno
[ 74%] Building C object applets/wnck/deskno/CMakeFiles/deskno.dir/deskno.c.o
[ 76%] Linking C shared module libdeskno.so
[ 76%] Built target deskno
[ 77%] Generating wincmd.c
Scanning dependencies of target wincmd
[ 78%] Building C object applets/wnck/wincmd/CMakeFiles/wincmd.dir/wincmd.c.o
[ 80%] Linking C shared module libwincmd.so
[ 80%] Built target wincmd
[ 81%] Generating buttons.c
Scanning dependencies of target buttons
[ 82%] Building C object applets/wnck/buttons/CMakeFiles/buttons.dir/buttons.c.o
[ 84%] Linking C shared module libbuttons.so
[ 84%] Built target buttons
[ 85%] Generating xembed-socket.c;xembed-internal.h
/home/juhwon/Downloads/vala-panel/applets/wnck/xembed/xembed-socket.vala:30.17-30.37: warning: Gdk.Window.set_composited has been deprecated since 3.16
Compilation succeeded - 1 warning(s)
[ 86%] Generating xembed.c
Scanning dependencies of target xembed
[ 88%] Building C object applets/wnck/xembed/CMakeFiles/xembed.dir/xembed.c.o
[ 89%] Building C object applets/wnck/xembed/CMakeFiles/xembed.dir/xembed-socket.c.o
[ 90%] Building C object applets/wnck/xembed/CMakeFiles/xembed.dir/xembed-ccode.c.o
[ 92%] Linking C shared module libxembed.so
[ 92%] Built target xembed
[ 93%] Generating cpu.c
Scanning dependencies of target cpu
[ 94%] Building C object applets/drawing/cpu/CMakeFiles/cpu.dir/cpu.c.o
[ 96%] Linking C shared module libcpu.so
[ 96%] Built target cpu
[ 97%] Generating monitors.c
/home/juhwon/Downloads/vala-panel/applets/drawing/monitors/monitors.vala:179.5-179.31: warning: method `Monitor.ref' never used
    public unowned Monitor @ref ()
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
/home/juhwon/Downloads/vala-panel/applets/drawing/monitors/monitors.vala:184.5-184.21: warning: method `Monitor.unref' never used
    public void unref ()
    ^^^^^^^^^^^^^^^^^
Compilation succeeded - 2 warning(s)
Scanning dependencies of target monitors
[ 98%] Building C object applets/drawing/monitors/CMakeFiles/monitors.dir/monitors.c.o
[100%] Linking C shared module libmonitors.so
[100%] Built target monitors

sudo make install
[  0%] Built target i18n
[ 20%] Built target valapanel
[ 28%] Built target vala-panel
[ 34%] Built target kbled
[ 38%] Built target separator
[ 46%] Built target menumodel
[ 50%] Built target clock
[ 54%] Built target dirmenu
[ 64%] Built target launchbar
[ 68%] Built target tasklist
[ 72%] Built target pager
[ 76%] Built target deskno
[ 80%] Built target wincmd
[ 84%] Built target buttons
[ 92%] Built target xembed
[ 96%] Built target cpu
[100%] Built target monitors
Install the project...
-- Install configuration: ""
-- Installing: /usr/share/locale/sr@latin/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sm/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/lo/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/bi/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/dv/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ki/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/hz/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ss/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ky/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/gn/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ha/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ku/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/et/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sq/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/st/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ti/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/pi/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/es/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/lv/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/rue/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/cs/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/mr/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/si/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/nn/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/so/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ba/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/mo/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/mt/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/lu/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/es_VE/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ks/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ab/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ml/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/ro/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ny/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/tn/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/mi/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/se/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ae/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/pt/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ff/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/fr_CA/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/az/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/iu/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/tk/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/cr/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ng/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/gd/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/fi/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/vi/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/kj/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/km/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sk/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/rw/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ik/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/kk/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/uk/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sv/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/li/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ta/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/pa/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/mg/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/kg/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sl/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ak/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/el/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/na/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/pt_BR/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ee/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/la/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sn/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/as/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/fj/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ts/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/tw/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/nb/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/tt_RU/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/su/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/zh_HK/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ay/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/an/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/kl/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/br/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ln/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ckb/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/gu/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/yi/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/uz/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/frp/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ru/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/gl/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/bs/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/en_CA/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/bh/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/nl/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/lb/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ko/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/bo/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/eo/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/pl/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ms/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/za/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/ve/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/lg/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/mk/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/bn_IN/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/nv/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/de/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/te/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/yo/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/zu/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ty/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/cv/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/en_GB/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/tl/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/wo/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sd/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ii/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/zh_CN/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/fa/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/tg/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/ch/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/fr/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/tr/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/om/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ne/LC_MESSAGES/vala-panel.mo
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-- Installing: /usr/share/locale/zh_TW/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/da/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/eu/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/it/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ca/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/to/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sw/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/my/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/cu/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/nr/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ka/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/en_AU/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/aa/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ps/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/fy/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ga/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sc/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/io/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/jv/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/sa/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/hr/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/oj/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/mh/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ug/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/is/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/ho/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/share/locale/lt/LC_MESSAGES/vala-panel.mo
-- Installing: /usr/lib/libvalapanel.so.0.3.5
-- Up-to-date: /usr/lib/libvalapanel.so.0
-- Up-to-date: /usr/lib/libvalapanel.so
-- Installing: /usr/lib/pkgconfig/vala-panel.pc
-- Installing: /usr/share/vala/vapi/vala-panel.vapi
-- Installing: /usr/share/vala/vapi/vala-panel.deps
-- Installing: /usr/include/vala-panel/vala-panel.h
-- Installing: /usr/bin/vala-panel
-- Set runtime path of "/usr/bin/vala-panel" to ""
-- Installing: /usr/lib/vala-panel/applets/libkbled.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libkbled.so" to ""
-- Installing: /usr/lib/vala-panel/applets/kbled.plugin
-- Installing: /usr/lib/vala-panel/applets/libseparator.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libseparator.so" to ""
-- Installing: /usr/lib/vala-panel/applets/separator.plugin
-- Installing: /usr/lib/vala-panel/applets/libmenumodel.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libmenumodel.so" to ""
-- Installing: /usr/lib/vala-panel/applets/menumodel.plugin
-- Installing: /usr/lib/vala-panel/applets/libclock.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libclock.so" to ""
-- Installing: /usr/lib/vala-panel/applets/clock.plugin
-- Installing: /usr/lib/vala-panel/applets/libdirmenu.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libdirmenu.so" to ""
-- Installing: /usr/lib/vala-panel/applets/dirmenu.plugin
-- Installing: /usr/lib/vala-panel/applets/liblaunchbar.so
-- Set runtime path of "/usr/lib/vala-panel/applets/liblaunchbar.so" to ""
-- Installing: /usr/lib/vala-panel/applets/launchbar.plugin
-- Installing: /usr/lib/vala-panel/applets/libtasklist.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libtasklist.so" to ""
-- Installing: /usr/lib/vala-panel/applets/tasklist.plugin
-- Installing: /usr/lib/vala-panel/applets/libpager.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libpager.so" to ""
-- Installing: /usr/lib/vala-panel/applets/pager.plugin
-- Installing: /usr/lib/vala-panel/applets/libdeskno.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libdeskno.so" to ""
-- Installing: /usr/lib/vala-panel/applets/deskno.plugin
-- Installing: /usr/lib/vala-panel/applets/libwincmd.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libwincmd.so" to ""
-- Installing: /usr/lib/vala-panel/applets/wincmd.plugin
-- Installing: /usr/lib/vala-panel/applets/libbuttons.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libbuttons.so" to ""
-- Installing: /usr/lib/vala-panel/applets/buttons.plugin
-- Installing: /usr/lib/vala-panel/applets/libxembed.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libxembed.so" to ""
-- Installing: /usr/lib/vala-panel/applets/xembed.plugin
-- Installing: /usr/lib/vala-panel/applets/libcpu.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libcpu.so" to ""
-- Installing: /usr/lib/vala-panel/applets/cpu.plugin
-- Installing: /usr/lib/vala-panel/applets/libmonitors.so
-- Set runtime path of "/usr/lib/vala-panel/applets/libmonitors.so" to ""
-- Installing: /usr/lib/vala-panel/applets/monitors.plugin
-- Installing: /usr/share/glib-2.0/schemas/org.valapanel.gschema.xml
-- Compiling GSettings schemas
-- Installing: /usr/share/glib-2.0/schemas/org.valapanel.toplevel.gschema.xml
-- Compiling GSettings schemas
-- Installing: /usr/share/glib-2.0/schemas/org.valapanel.builtin.gschema.xml
-- Compiling GSettings schemas
-- Installing: /usr/share/glib-2.0/schemas/org.valapanel.X.gschema.xml
-- Compiling GSettings schemas
-- Installing: /usr/share/glib-2.0/schemas/org.valapanel.plugins.gschema.xml
-- Compiling GSettings schemas
-- Installing: /etc/xdg/vala-panel/default/config
-- Installing: /etc/xdg/vala-panel/default/panels/panel
-- Installing: /etc/xdg/vala-panel/two_panels/config
-- Installing: /etc/xdg/vala-panel/two_panels/panels/top
-- Installing: /etc/xdg/vala-panel/two_panels/panels/bottom
-- Installing: /etc/xdg/vala-panel/appmenu/config
-- Installing: /etc/xdg/vala-panel/appmenu/panels/top
-- Installing: /usr/share/icons/hicolor/scalable/apps/vala-panel.svg
-- Installing: /usr/share/vala-panel/images/background.png
-- Installing: /usr/share/man/man1/vala-panel.1

Sadly when i try to start vala-panel i get warnings that vala-panel can not load plugins and so i can not add any items:

vala-panel 

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: separator

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: menumodel

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: launchbar

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: separator

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: wincmd

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: separator

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: pager

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: separator

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: tasklist

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: cpu

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: xembed

** (vala-panel:18975): WARNING **: panel-toplevel.vala:812: Could not find plugin: clock

Additionally i have to say that i had a running vala-panel then i tried to install vala-panel-appmenu i guess with wrong cmake parameters cuz the libdir was strange e.g. And suddenly it bricked.

So i removed all folders which show up at whereis vala-panel and executed the commands above.

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