[Bug 195467] New: pkg built from ports reports it needs to be reinstalled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195467

            Bug ID: 195467
           Summary: pkg built from ports reports it needs to be
                    reinstalled
           Product: Ports Tree
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: peterj at FreeBSD.org
                CC: portmgr at FreeBSD.org
                CC: portmgr at FreeBSD.org

I usually locally build all ports but decided to install lang/squeak to check
an issue reported on a mailing list.  Unfortunately, pkg insists that it needs
to be reinstalled, even after being freshly rebuilt:

server% sudo pkg install lang/squeak 
Updating FreeBSD repository catalogue...
FreeBSD repository is up-to-date.
All repositories are up-to-date.
New version of pkg detected; it needs to be installed first.
The following 1 packages will be affected (of 0 checked):

Installed packages to be REINSTALLED:
        pkg-1.3.8_3 (needed shared library changed)

The operation will free 301 KB.
2 MB to be downloaded.

Proceed with this action? [y/N]: n
server% pkg info pkg-1.3.8_3
pkg-1.3.8_3
Name           : pkg
Version        : 1.3.8_3
Installed on   : Fri Nov 28 06:31:33 EST 2014
Origin         : ports-mgmt/pkg
Architecture   : freebsd:10:x86:64
Prefix         : /usr/local
Categories     : ports-mgmt
Licenses       : BSD2CLAUSE
Maintainer     : portmgr at FreeBSD.org
WWW            : http://wiki.freebsd.org/pkgng
Comment        : Package manager
Shared Libs required:
        libexecinfo.so.1
Shared Libs provided:
        libpkg.so.3
Flat size      : 9.60MiB
Description    :
Package management tool

WWW: http://wiki.freebsd.org/pkgng

server% pkg search -fe pkg-1.3.8_3
pkg-1.3.8_3
Name           : pkg
Version        : 1.3.8_3
Installed on   : Thu Jan  1 10:00:00 EST 1970
Origin         : ports-mgmt/pkg
Architecture   : freebsd:10:x86:64
Prefix         : /usr/local
Repository     : FreeBSD [pkg+http://pkg.FreeBSD.org/freebsd:10:x86:64/latest]
Categories     : ports-mgmt
Licenses       : BSD2CLAUSE
Maintainer     : portmgr at FreeBSD.org
WWW            : http://wiki.freebsd.org/pkgng
Comment        : Package manager
Shared Libs provided:
        libpkg.so.3
Flat size      : 9.31MiB
Pkg size       : 2 MB
Description    :
Package management tool

WWW: http://wiki.freebsd.org/pkgng
server% 

The only obvious difference is the requirement for libexecinfo.so.1 in the
installed version.  The reason for this is unclear - it's not listed anywhere
in the Makefile, though the configure script does test for it.  It's present in
the base system, though I also have libexecinfo-1.1_3 installed (as a
requirement for llvm and samba) and ldd shows pkg is relying on the port:

server% ldd /usr/local/sbin/pkg   
/usr/local/sbin/pkg:
        libpkg.so.3 => /usr/local/lib/libpkg.so.3 (0x80086f000)
        libelf.so.1 => /usr/lib/libelf.so.1 (0x800c3e000)
        libexecinfo.so.1 => /usr/local/lib/libexecinfo.so.1 (0x800e53000)
        libfetch.so.6 => /usr/lib/libfetch.so.6 (0x801056000)
        libutil.so.9 => /lib/libutil.so.9 (0x801268000)
        libssl.so.7 => /usr/lib/libssl.so.7 (0x80147a000)
        libcrypto.so.7 => /lib/libcrypto.so.7 (0x8016e4000)
        libm.so.5 => /lib/libm.so.5 (0x801ad7000)
        libjail.so.1 => /lib/libjail.so.1 (0x801cfd000)
        libarchive.so.6 => /usr/lib/libarchive.so.6 (0x801f02000)
        libz.so.6 => /lib/libz.so.6 (0x80219d000)
        libbz2.so.4 => /usr/lib/libbz2.so.4 (0x8023b3000)
        liblzma.so.5 => /usr/lib/liblzma.so.5 (0x8025c5000)
        libc.so.7 => /lib/libc.so.7 (0x8027ea000)
        libbsdxml.so.4 => /lib/libbsdxml.so.4 (0x802b86000)

A friend who has also built pkg reports the same behaviour.
There are multiple issues here:
- Why is a freshly built pkg reporting it needs to be reinstalled?
- Why doesn't pkg report details of why it needs to be reinstalled? Which
shared library has changed and how?
- Why is pkg linking against a library not listed as a dependency?

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