Building esp-open-sdk

Following the instructions in
                 https://github.com/pfalcon/esp-open-sdk

until make. You might meet errors because of missing tools.

These are the things I did:

sudo apt-get install autoconf
sudo apt-get install gperf
sudo apt-get install bison
sudo apt-get install flex
sudo apt-get install texinfo
sudo apt-get install help2man
sudo apt-get install gawk
sudo apt-get install libncurses5-dev

Hope it helps you.

ref:
https://github.com/pfalcon/esp-open-sdk
https://github.com/crosstool-ng/crosstool-ng/issues/329
https://www.crifan.com/files/doc/docbook/crosstool_ng/release/htmls/crosstool_ng_common_errors.html#missing_gperf
https://www.howtoinstall.co/en/ubuntu/trusty/help2man
https://askubuntu.com/questions/710379/do-i-need-to-install-awk-or-is-it-inbuilt-in-ubuntu
https://www.crifan.com/ubuntu_crosstool_ng_configure_error_could_not_find_curses_header_required_for_the_kconfig_frontends/