Building the kernel

[Frank Elsner]

Hello,

as announced I started to build the kernel myself.

Following the documentation in 
https://fedoraproject.org/wiki/Building_a_custom_kernel/Source_RPM

I downloaded the kernel SRPM.

But when I do the step "Install kernel-<version>.src.rpm with the following
command:"
by executing 
               rpm -Uvh ~/Downloads/kernel-4.17.9-200.fc28.src.rpm

I can't proceed to the next step 

 Change to the kernel source tree directory:
 cd ~/rpmbuild/BUILD/kernel-$ver.$fedver/linux-$ver.$subver.$fedver.$arch/

because ~/rpmbuild/BUILD is empty but ~/rpmbuild/SOURCES has *.config files and patches.

Why is ~/rpmbuild/BUILD empty? Documention in error or what is my error?


Cheers,
        Frank