Little late for that but I had the same problem... just install missing libs. In my case was zlib1g:i386 ( sudo apt-get install zlib1g:i386 ) because i´m using a 64 bit ubuntu. Hope that solve your problem. Espero ter ajudado.
I get compilation error: make[5]: Entering directory `/dados/rtl8196/rtk25/build_dir/target-mips-rlx4181-linux/linux-realtek_rtl8196e/linux-3.10.49' scripts/kconfig/conf --silentoldconfig Kconfig net/sched/Kconfig:43: warning: menuconfig statement without prompt arch/rlx/config.in:43:warning: defaults for choice values not supported drivers/net/rtl819x/Kconfig:228:warning: config symbol defined without type drivers/net/rtl819x/Kconfig:247:warning: config symbol defined without type .config:858:warning:...