Build failure on macOS Sierra due to redefinition of clockid_t and CLOCK_REALTIME

cvs-fast-export 1.4.3 fails to build on macOS Sierra (but builds fine on OS X El Capitan and earlier).

The error is:

In file included from /home/esr/public_html/cvs-fast-export//gram.y:8:
./cvs.h:437:13: error: typedef redefinition with different types ('int' vs 'enum clockid_t')
typedef int clockid_t;
            ^
/usr/include/time.h:171:3: note: previous definition is here
} clockid_t;
  ^
In file included from /home/esr/public_html/cvs-fast-export//gram.y:8:
./cvs.h:439:9: warning: 'CLOCK_REALTIME' macro redefined [-Wmacro-redefined]
#define CLOCK_REALTIME  0
        ^
/usr/include/time.h:154:9: note: previous definition is here
#define CLOCK_REALTIME _CLOCK_REALTIME
        ^
1 warning and 1 error generated.

This appears to be because cvs.h erroneously assumes clockid_t and CLOCK_REALTIME need to be defined on all Apple systems. Apple added these definitions in macOS Sierra.

I've pushed an attempted fix. Please test.

Thanks, that works for me.

closed