Cannot build root filesystem using Buildroot on Ubuntu 14.10

Hello,

I'm building Linux kernel and root filesystem for Arrow SoCKit.

I've installed cross compiler on Ubuntu 14.10 machine:

$ sudo apt-get install gcc-arm-linux-gnueabihf

$ arm-linux-gnueabihf-gcc --version

arm-linux-gnueabihf-gcc (Ubuntu/Linaro 4.9.1-16ubuntu6) 4.9.1

Copyright (C) 2014 Free Software Foundation, Inc.

This is free software; see the source for copying conditions. There is NO

warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

The cross-compiler works. I've used it to build kernel for Arrow SoCKit:

$ make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm socfpga_defconfig

$ alias armmake='make CROSS_COMPILE=arm-linux-gnueabihf- ARCH=arm' <--I put this into .profile

$ armmake -j4 uImage LOADADDR=0x8000 <-- this produced the expected uImage

But then I run into problem trying to build root fs for SoCKit using Buildroot-2014.11:

$ make menuconfig

Within Buildroot menuconfig I set the Toolchain as follows:

Toolchain type (External toolchain) --->

Toolchain (Custom toolchain) --->

Toolchain origin (Pre-installed toolchain) --->

(/usr/) Toolchain path

(arm-linux-gnueabihf) Toolchain prefix

External toolchain kernel headers series (3.1.x) --->

External toolchain C library (glibc/eglibc) --->

[*] Toolchain has RPC support?

[*] Toolchain has C++ support?

() Extra toolchain libraries to be copied to target

[ ] Copy gdb server to the Target

[ ] Build cross gdb for the host

[ ] Purge unwanted locales

() Generate locale data

[ ] Copy gconv libraries

[*] Enable MMU support

(-pipe) Target Optimizations

() Target linker options

[ ] Register toolchain within Eclipse Buildroot plug-in

Then run make and get the following error:

$ make

/usr/bin/make -j1 HOSTCC="/usr/bin/gcc" HOSTCXX="/usr/bin/g++" silentoldconfig

make[1]: Entering directory '/home/jeff/buildroot-2014.11'

BR2_DEFCONFIG='' KCONFIG_AUTOCONFIG=/home/jeff/buildroot-2014.11/output/build/buildroot-config/auto.conf KCONFIG_AUTOHEADER=/home/jeff/buildroot-2014.11/output/build/buildroot-config/autoconf.h KCONFIG_TRISTATE=/home/jeff/buildroot-2014.11/output/build/buildroot-config/tristate.config BR2_CONFIG=/home/jeff/buildroot-2014.11/.config BR2_EXTERNAL=support/dummy-external /home/jeff/buildroot-2014.11/output/build/buildroot-config/conf --silentoldconfig Config.in

make[1]: Leaving directory '/home/jeff/buildroot-2014.11'

>>> toolchain-external undefined Configuring

cc1: fatal error: /usr/arm-linux-gnueabihf//usr/include/linux/version.h: No such file or directory

compilation terminated.

support/scripts/check-kernel-headers.sh: 38: support/scripts/check-kernel-headers.sh: /tmp/check-headers.uAeguv: Permission denied

package/pkg-generic.mk:172: recipe for target '/home/jeff/buildroot-2014.11/output/build/toolchain-external-undefined/.stamp_configured' failed

make: *** [/home/jeff/buildroot-2014.11/output/build/toolchain-external-undefined/.stamp_configured] Error 1

I've used Buildroot in Arch Linux without encountering the above problem. I'm new to Ubuntu, and can't figure out what is going wrong.

Can anyone help? Thanks!