cc -DTZDIR='"/usr/share/zoneinfo"'  -DUSG_COMPAT=1 -DHAVE_POSIX_DECLS=0 -c zic.c -o zic.o
In file included from zic.c:9:
./private.h:520:13: error: redefinition of 'timezone' as different kind of symbol
extern long timezone;
            ^
/usr/include/time.h:197:7: note: previous definition is here
char *timezone(int, int);       /* XXX XSI conflict */
      ^
1 error generated.
*** Error code 1

Stop.
make: stopped in /usr/home/dogg/min/mod/tzdb-2019c