indicator error

checking for indicator >= 0.3.0... not found
*** The required package indicator was not found on your system.
*** Please install indicator (atleast version 0.3.0) or adjust
*** the PKG_CONFIG_PATH environment variable if you
*** installed the package in a nonstandard prefix so that
*** pkg-config is able to find it.
Creating /var/log/lunar/compile/xfce4-indicator-plugin-0.2.0.xz
! Problem detected during BUILD