Installation Issue: throwing "error 71"
- Thank you for your work.
- Thank you for your patience and help with this installation issue.

- I am running macOS Mojave 10.14 (18A389) – most-recent beta as of 2018-09-22.
- My perl5: revision 5 version 18 subversion 2.

- I run the installation commands and get the following:

```
$ make PREFIX=/usr
gzip -c doc/man/taskopen.1 > doc/man/taskopen.1.gz
gzip -c doc/man/taskopenrc.5 > doc/man/taskopenrc.5.gz
sed s',#PATH_EXT=.*,&\nPATH_EXT=/usr/share/taskopen/scripts,' taskopen > taskopen.pl

$ make PREFIX=/usr install
gzip -c doc/man/taskopen.1 > doc/man/taskopen.1.gz
gzip -c doc/man/taskopenrc.5 > doc/man/taskopenrc.5.gz
sed s',#PATH_EXT=.*,&\nPATH_EXT=/usr/share/taskopen/scripts,' taskopen > taskopen.pl
mkdir -p //usr/bin
install -m 0755 taskopen.pl //usr/bin/taskopen
install: //usr/bin/taskopen: Operation not permitted
make: *** [install] Error 71
```

- I tried using the solution in Issue #113 but it doesn't seem to make a difference.
- Any pointers would be greatly appreciated; I'm exciting to get taskopen working on my system!