[yocto] yocto layer dependencies

[ktreddy 70]

I am trying to set up yocto build environment for openlte, meta-sdr has
most of the openlte depends
I am getting following error when I try to build sdr,


/build$ bitbake sdr
Loading cache: 100% |#############################
############################################################
###################################################| Time: 0:00:00
Loaded 1642 entries from dependency cache.
ERROR: ParseError at /home/ktreddy/zcu102/sources/p
oky/../meta-openembedded/meta-sdr/recipes-applications/gqrx/gqrx_git.bb:8:
Could not inherit file classes/qt4x11.bbclass


I do have meta-qt4 under meta-openembedded layer  as below.

zcu102/sources$* ls *meta-openembedded/meta-qt4/classes/
qmake2.bbclass  qmake_base.bbclass  qt4e.bbclass  *qt4x11.bbclass*


could you please help me on why am I getting this error ?
How can I make one layer visible to another layer ?
Ex:  How can I make meta-sdr visible to openlte ? I mean how can I say to
openlte that the dependency recipes are available under meta-sdr ?

if new recipes are available for a layer how can I get those on to my build
environment ?

Thanks for your help.
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