Tvheadend

After revision f9891cf7 move sbuf definitions to sbuf.h on master, compiling fails with the below error.

In file included from /tmp/tvheadend/src/service.h:22:0,
from src/input/mpegts/mpegts_service.c:22:
/tmp/tvheadend/src/sbuf.h:77:1: error: unknown type name 'ssize_t'
ssize_t sbuf_read(sbuf_t *sb, int fd);
^~~~~~~
make: *** [Makefile:701: /tmp/tvheadend/build.linux/src/input/mpegts/mpegts_service.o] Error 1

This is a docker container build and using Alpine Linux 3.6 as the OS, so it's musl based. The full build log of the container and compiling of tvheadend can be found here https://ci.linuxserver.io/view/Last%20Build%20Failed/job/Docker-Builders/job/x86-64/job/x86-64-tvheadend/128/console

Hopfully you can help finding the issue. If you need more info, please let me know.