Tinkering OpenWRT (16) : openwrt Chaos Calmer Build dependency: Please install Git (git-core) >= 1.6.5

For some reason, I'd like to build my openwrt from 15.05 Chaos Calmer. But I ran into the following problem:

~/workspace/chaos_calmer$ make menuconfig 
Checking 'working-make'... ok.
Checking 'case-sensitive-fs'... ok.
Checking 'gcc'... ok.
Checking 'working-gcc'... ok.
Checking 'g++'... ok.
Checking 'working-g++'... ok.
Checking 'ncurses'... ok.
Checking 'zlib'... ok.
Checking 'libssl'... ok.
Checking 'tar'... ok.
Checking 'find'... ok.
Checking 'bash'... ok.
Checking 'patch'... ok.
Checking 'diff'... ok.
Checking 'cp'... ok.
Checking 'seq'... ok.
Checking 'awk'... ok.
Checking 'grep'... ok.
Checking 'getopt'... ok.
Checking 'stat'... ok.
Checking 'md5sum'... ok.
Checking 'unzip'... ok.
Checking 'bzip2'... ok.
Checking 'wget'... ok.
Checking 'perl'... ok.
Checking 'python'... ok.
Checking 'svn'... ok.
Checking 'git'... failed.
Checking 'file'... ok.
Checking 'openssl'... ok.
Checking 'ldconfig-stub'... ok.

Build dependency: Please install Git (git-core) >= 1.6.5

/home/boris/workspace/openWRT_build/openwrt_RPi/chaos_calmer/include/prereq.mk:12: recipe for target 'prereq' failed
Prerequisite check failed. Use FORCE=1 to override.
/home/boris/workspace/openWRT_build/openwrt_RPi/chaos_calmer/include/toplevel.mk:140: recipe for target 'staging_dir/host/.prereq-build' failed
make: *** [staging_dir/host/.prereq-build] Error 1

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Solution:

Step 1: Download the patch from here:

https://gitlab.labs.nic.cz/turris/openwrt/uploads/0673001b14ab1d1769604ff0ce7d8781/git-version-check-fix.patch

Step 2: put the patch file under the chaos calmer source code

Step 3: patch it

git apply git-version-check-fix.patch

ref:

https://forum.openwrt.org/t/solved-how-to-compile-15-05-release-build-dependency-please-install-git-git-core-1-6-5-message/11623/3

https://gitlab.labs.nic.cz/turris/openwrt/issues/56

https://github.com/spack/spack/issues/5329