[Bug 257222] Cannot use libzfs.h from user space programs due to missing libnvpair.h and other dependencies

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257222

Michael Gmelin <grembo@FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|Affects Only Me             |Affects Some People
             Status|Closed                      |Open
                 CC|                            |grembo@FreeBSD.org
         Resolution|Works As Intended           |---

--- Comment #2 from Michael Gmelin <grembo@FreeBSD.org> ---
(In reply to Alan Somers from comment #1)

Re-opening, as even if using libzfs_core.h kernel sources are required, so all
the problems described by the bug author still exist.

This is how /usr/include/libzfs_core.h begins:

```
#ifndef _LIBZFS_CORE_H
#define _LIBZFS_CORE_H

#include <libnvpair.h>
```


Minimal example:

```
$ cat >test.c <<EOF
#include <libzfs_core.h>

int main()
{

}
EOF

$ cc test.c
/usr/include/libzfs_core.h:32:10: fatal error: 'libnvpair.h' file not found
#include <libnvpair.h>
         ^~~~~~~~~~~~~
1 error generated.

$ find / -name libnvpair.h
/usr/src/sys/contrib/openzfs/include/libnvpair.h

Try adding it to the search path:

$ cc -I/usr/src/sys/contrib/openzfs/include test.c
tons of errors, many more include paths required...
```

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