#3 Compilation fails against the musl C library

[Brendan Heading]

Hi guys,

When compiling against musl the build fails :

compat.c: In function ‘strnstr’:
compat.c:70:3: error: unknown type name ‘ssize_t’
ssize_t plen;
^
compat.c:71:3: error: unknown type name ‘ssize_t’
ssize_t len = strlen(needle);
^
Makefile:291: recipe for target 'compat.o' failed

This is because <unistd.h> is not included, as required for the ssize_t type. glibc seems to allow this (probably because of nested includes) but it breaks under musl.

[Brendan Heading]

Patch to fix this problem attached.