Error compiling on cygwin x86-64 (missing typedef?)

[PikalaxALT]

Below is the relevant portion of the error dump. From this I suspect that _IO_ssize_t is not defined within the context of aslink.h.

make[4]: Entering directory '~/gbdk/sdcc/link/z80'
mkdir -p obj/-z80
gcc -c -ggdb -O2 -pipe -Wall  -I. -I../.. -I../../support/Util  -DINDEXLIB -DMLH_MAP -DUNIX -DSDK -funsigned-char -DUNIX -I../../as/z80 -I../../support/Util  -o obj/-z80/lkarea.o lkarea.c
In file included from lkarea.c:13:0:
../../as/z80/string.h:9:12: warning: conflicting types for built-in function ‘strlen’
 extern int strlen();
            ^
In file included from lkarea.c:14:0:
aslink.h:638:8: error: unknown type name ‘_IO_ssize_t’
 extern _IO_ssize_t getline(char **__restrict __lineptr, size_t *__restrict __n, FILE *__restrict __stream);
        ^
aslink.h:638:20: error: conflicting types for ‘getline’
 extern _IO_ssize_t getline(char **__restrict __lineptr, size_t *__restrict __n, FILE *__restrict __stream);
                    ^
In file included from /usr/include/stdio.h:29:0,
                 from lkarea.c:12:
/usr/include/sys/stdio.h:35:9: note: previous declaration of ‘getline’ was here
 ssize_t _EXFUN(getline, (char **, size_t *, FILE *));
         ^
make[4]: *** [Makefile:33: obj/-z80/lkarea.o] Error 1

[IoIxD]

Use this updated version: https://github.com/andreasjhkarlsson/gbdk-n