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This change removes the option to build without specifying the environment variable $IMPALA_TOOLCHAIN. By default, if it's not set, sourcing impala-config.sh will set it to $IMPALA_HOME/toolchain. A user can override it by setting $IMPALA_TOOLCHAIN to his/her own toolchain directory. The user can also set $SKIP_TOOLCHAIN_BOOTSTRAP to true to avoid running the toolchain bootstrapping script (e.g. a particular component in toolchain is at a version not checked into S3). $IMPALA_TOOLCHAIN holds some third party binaries which Impala relies on. They can be compiled from source in the native toolchain which is public. This commit also removes build_thirdparty.sh as it's no longer used. By default, Impala will be built with the compiler in $IMPALA_TOOLCHAIN but this option can be overridden by setting environment variable $USE_SYSTEM_GCC to 1. Change-Id: I42b60e99fb9caf1294be7ab242856ca3b9a5ab73 Reviewed-on: http://gerrit.cloudera.org:8080/3259 Reviewed-by: Michael Ho <kwho@cloudera.com> Tested-by: Michael Ho <kwho@cloudera.com>