x11 not being found on CMakeCache.txt

X11_ICE_LIB:FILEPATH=X11_ICE_LIB-NOTFOUND

//Path to a file.
X11_SM_INCLUDE_PATH:PATH=X11_SM_INCLUDE_PATH-NOTFOUND

//Path to a library.
X11_SM_LIB:FILEPATH=X11_SM_LIB-NOTFOUND

//Path to a file.
X11_X11_INCLUDE_PATH:PATH=X11_X11_INCLUDE_PATH-NOTFOUND

//Path to a library.
X11_X11_LIB:FILEPATH=X11_X11_LIB-NOTFOUND

//Path to a file.
X11_XRes_INCLUDE_PATH:PATH=X11_XRes_INCLUDE_PATH-NOTFOUND

//Path to a library.
X11_XRes_LIB:FILEPATH=X11_XRes_LIB-NOTFOUND