Checking 'ldconfig-stub'... failed openwrt version 18.06


I'm trying to build openwrt 18.06 for TL-WR740N Ver.4.28.
I have compiled successfully latest version from master branch of openwrt.

I am trying to build image smaller than 4MB.
But when I checkout to version 18.06 and type command "make menuconfig", I'm getting message:
Checking 'ldconfig-stub'... failed.

Build dependency: Failed to install stub

Prerequisite check failed. Use FORCE=1 to override.
make: *** [/home/viti/buildboot/openwrt/include/ staging_dir/host/.prereq-build] Error 1

and menuconfig failed to start.

Can you please advice me what is wrong, what I'm missing?