Bumblebee install error

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http://forums.fedoraforum.org – Hi partners, when i type ./configure this appear: checking for x11... no configure: error: Package requirements (x11) were not met: No package 'x11' found Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix. Alternatively, you may set the environment variables x11_CFLAGS and x11_LIBS to avoid the need to call pkg-config. See the pkg-config man page for more details. What packages i need to install? Ty (HowTos)