Build Linux Image for HDL Coder

I'm trying to follow along with the documentation here: https://www.mathworks.com/help/hdlcoder/ug/xilinx-zynq-linux-image-for-custom-boards.html for creating the Linux image using Mathwork's buildroot. Eventually I have a custom board that I need to create an image for but initially I was trying to build image for the Arrow SoC kit. I did a git clone https://github.com/mathworks/buildroot and I checked out the mathworks_socfpga_R23.2.0 tag. I ran the command:

python build.py -b sockit -p socfpga --brconfig BR2_TOOLCHAIN_EXTERNAL_PATH='/opt/linaro/aarch32-6.3.1-2017.02'

However, it keeps failing on:

Incorrect selection of kernel headers: expected 3.1.x, got 4.6.x

I'm not able to resolve this by changing the header selection in make menuconfig. I'd appreciate any suggestions on how to resolve this. Thank you.

[John]

I got passed this error by editing the following lines of board/mathworks/socfpga/defconfig/linaro.defconfig:

BR2_TOOLCHAIN_EXTERNAL_GCC_6=y

BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_6=y

However, I am now getting the error:

freadahead.c: In function 'freadahead':

freadahead.c:92:3: error: #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."

92 | #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."

| ^~~~~

Thanks for any help.