Please submit a full bug report, with preprocessed source if appropriate. See <http://bugs.buildroot.net/> for instructions. make[1]: *** [libc/misc/internals/errno.os] Error 1 make[1]: Leaving directory `/home/home/Downloads/buildroot-2012.11.1/output/toolchain/uClibc-0.9.33.2' make: *** [/home/home/Downloads/buildroot-2012.11.1/output/toolchain/uClibc-0.9.33.2/lib/libc.a] Error 2
From the snippet it looks like an internal compiler error. Please post more details about what exactly goes wrong (your buildroot .config), more lines of error output
Bug reported in January, never had enough details provided to fix it.