"clock_gettime" error on macOS

Hello, I'm trying to install midish, according to the manual. When I run the make I get this error:

cc   -DUSE_RAW -c mdep.c
mdep.c:68:9: warning: 'CLOCK_MONOTONIC' macro redefined [-Wmacro-redefined]
#define CLOCK_MONOTONIC 0
        ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/include/time.h:156:9: note: previous definition is here
#define CLOCK_MONOTONIC _CLOCK_MONOTONIC
        ^
mdep.c:71:1: error: conflicting types for 'clock_gettime'
clock_gettime(int which, struct timespec *ts)
^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk/usr/include/time.h:177:5: note: previous declaration is here
int clock_gettime(clockid_t __clock_id, struct timespec *__tp);
    ^
1 warning and 1 error generated.
make: *** [mdep.o] Error 1

Any solution, is there something wrong with my machine, or is it your code? Thanks.