compile fails with x86_64-alpine-linux-uclibc-gcc

hello,

i am trying to build R on alpine/gentoo and it fails with the following
error msg:

connections.c: In function 'Rconn_fgetc':
connections.c:3184:11: error: expected identifier before '(' token
connections.c:3186:15: error: expected identifier before '(' token
make[3]: *** [connections.o] Error 1

any idea?
[see the attached file for a complete build log.]
i've walked back the versions down to 2.14.1 and i still get exact same
error msg.
couple of patches are applied which i will attach as well, but if you
find it too complicated, i can build from source by hand, if need be.

thanks