abd_os.h include path issues

[pfmooney]

System information

Type	Version/Name
Distribution Name	Arch Linux
Distribution Version	n/a
Kernel Version	n/a
Architecture	x86_64
OpenZFS Version	2.3.2

Describe the problem you're observing

After updating to OpenZFS 2.3.x, I've been unable to build pivy, which had some ZFS-related header dependencies. Specifically, it is unable to locate abd_os.h, following the reorganization done in 5b9e695.

Other ZFS headers include abd_os.h expect to do so via a sys/abd_os.h path, but the install configuration for those headers (post-reorganization) does not include the sys path component:

https://github.com/openzfs/zfs/blob/zfs-2.3.2/lib/libzpool/include/Makefile.am#L1-L4

Furthermore, if libzpooldir was updated to include the sys path component, so those headers were installed with an expected path, they still would not be discoverable as a necessary include directory via pkg-config.

Describe how to reproduce the problem

Attempt to build pivy on a Linux system with OpenZFS 2.3.x installed.

[pfmooney]

When I manually patched the above automake file to install into libzpool/sys, and patched the pivy build to include -I/usr/include/libzpool in addition to its pkg-config-detected bits, it was able to build and install successfully.

[robn]

Probably dupe #16940. Been meaning to get to that for a while, I'll take a look this morning.

[pfmooney]

Probably dupe #16940. Been meaning to get to that for a while, I'll take a look this morning.

Thanks for fixing it.