Default Building Error

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build/core/Makefile:70: warning: overriding commands for target `/home/karishnu/android/omni/out/target/product/mako/system/vendor/etc/audio_effects.conf'
build/core/ warning: ignoring old commands for target `/home/karishnu/android/omni/out/target/product/mako/system/vendor/etc/audio_effects.conf'
No private recovery resources for TARGET_DEVICE mako
host C: mkbootimg <= system/core/mkbootimg/mkbootimg.c
prebuilts/tools/gcc-sdk/gcc: line 40: prebuilts/tools/gcc-sdk/../../gcc/linux-x86/host/i686-linux-glibc2.7-4.6/bin/i686-linux-gcc: No such file or directory
make: *** [/home/karishnu/android/omni/out/host/linux-x86/obj/EXECUTABLES/mkbootimg_intermediates/mkbootimg.o] Error 127

real	2m5.615s
user	0m54.109s
sys	0m20.064s
while building for mako I get this error. I resynced the repo many times. Have no clue why i get this error. Using ubuntu 13.10 for building. i have also tried
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breakfast mako