checking for gmsgfmt... /usr/bin/msgfmt
checking for xgettext... /usr/bin/xgettext
checking for catalogs to be installed...  de ca hu lt uk
checking for locales directory... /opt/xfce4/share/locale
checking for pkg-config... /usr/bin/pkg-config
checking for xfce4-panel-1.0 >= 3.99.2... Package xfce4-panel-1.0 was not found                       in the pkg-config search path. Perhaps you should add the directory containing `                      xfce4-panel-1.0.pc' to the PKG_CONFIG_PATH environment variable No package 'xfce                      4-panel-1.0' found
configure: error: Library requirements (xfce4-panel-1.0 >= 3.99.2) not met; cons                      ider adjusting the PKG_CONFIG_PATH environment variable if your libraries are in                       a nonstandard prefix so pkg-config can find them.
Due to previous errors, no 9-xfce4-systemload-plugin.log file!
(Try enabling xtrace in the config to track an error inside the build system.)
--- BUILD ERROR ---