tarlz 0.18 build failure on FreeBSD 11.4

[David Glover-Aoki]

c++ -I /usr/local/include -O2 -c -o exclude.o exclude.cc
In file included from exclude.cc:29:
./tarlz.h:399:1: error: unknown type name 'mode_t'; did you mean '__mode_t'?
mode_t get_umask();
^~~~~~
__mode_t
/usr/include/sys/_types.h:49:20: note: '__mode_t' declared here
typedef __uint16_t      __mode_t;       /* permissions */
                        ^
1 error generated.
gmake: *** [Makefile:52: exclude.o] Error 1

Note that I am using gmake instead of (bsd) make because make still fails to 
find lzlib.h:

c++ -O2 -c archive_reader.cc -o archive_reader.o
archive_reader.cc:29:10: fatal error: 'lzlib.h' file not found
#include <lzlib.h>
         ^~~~~~~~~
1 error generated.
*** Error code 1

Stop.
make: stopped in /root/build/tarlz/tarlz-0.18

This latter issue was previously discussed:

https://www.mail-archive.com/lzip-bug@nongnu.org/msg00948.html

Although in that case gmake built successfully.

David.