bug report: build issue with git 2.2.2 using uclibc toolchain

I've been keeping up-to-date versions of git built for an embedded 
mipsel architecture device running on uclibc.
2.2.1 and previous versions build fine, but 2.2.2 stops with an error.

The toolchain is an OpenWRT variant (entware) using gcc 4.6.4 and uclibc 
0.9.32, available at the following.
http://entware.wl500g.info/sources/

Here is the output of the build error.

CC builtin/grep.o
builtin/get-tar-commit-id.c: In function 'cmd_get_tar_commit_id':
builtin/get-tar-commit-id.c:31:12: error: dereferencing pointer to 
incomplete type