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uname -a: Linux digifus 3.13.0-57-generic #95-Ubuntu SMP Fri Jun 19 09:28:15 UTC 2015 x86_64 

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/usr/src/linux-headers-3.13.0-57/scripts/   drwxr-xr-x
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Viewing file:     headers.sh (530 B)      -rwxr-xr-x

#!/bin/sh
# Run headers_$1 command for all suitable architectures

# Stop on error
set -e

do_command()
{
	if [ -f ${srctree}/arch/$2/include/asm/Kbuild ]; then
		make ARCH=$2 KBUILD_HEADERS=$1 headers_$1
	else
		printf "Ignoring arch: %s\n" ${arch}
	fi
}

archs=${HDR_ARCH_LIST:-$(ls ${srctree}/arch)}

for arch in ${archs}; do
	case ${arch} in
	um)        # no userspace export
		;;
	cris)      # headers export are known broken
		;;
	*)
		if [ -d ${srctree}/arch/${arch} ]; then
			do_command $1 ${arch}
		fi
		;;
	esac
done