lib/57548: lib/pkgconfig/liblzma.pc is missing in base

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

>Number:         57548
>Category:       lib
>Synopsis:       lib/pkgconfig/liblzma.pc is missing in base
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jul 29 03:00:01 +0000 2023
>Originator:     Izumi Tsutsui
>Release:        NetBSD 9.3
>Organization:
>Environment:
System: NetBSD optiplex 9.3 NetBSD 9.3 (GENERIC) #0: Thu Aug  4 15:30:37 UTC 2022  mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
After pkgsrc-2023Q1 pkgsrc/graphics/tiff 4.5.0 installs the following
pkgconfig file libtiff-4.pc:

---
prefix=/usr/pkg
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: libtiff
Description:  Tag Image File Format (TIFF) library.
Version: 4.5.0
Libs: -Wl,-R${libdir} -L${libdir} -ltiff
Libs.private: -llzma -ljbig -ljpeg -lz -lm 
Cflags: -I${includedir}
Requires.private: liblzma libjpeg zlib 
---

Note tiff 4.4.0 in pkgsrc-2022Q4 installs:

---
prefix=/usr/pkg
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: libtiff
Description:  Tag Image File Format (TIFF) library.
Version: 4.4.0
Libs: -Wl,-R${libdir} -L${libdir} -ltiff
Libs.private: -llzma -ljbig -ljpeg -lz -lm 
Cflags: -I${includedir}
Requires.private: 
---

I.e. "-llzma" (and other libraries) are added to "Requires.private"
after tiff-4.5.0.

However, on NetBSD 9.3 liblzma is in the base set and it doesn't provide
pkgconfig file for liblzma. Then certain packages that check dependencies
of libtiff-4 using pkg-config complains:

---
checking for
        gtk+-2.0
    ... no
configure: error: Package requirements (
        gtk+-2.0
    ) were not met:

Package 'liblzma', required by 'libtiff-4', not found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables GTK2_CFLAGS
and GTK2_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
---

>How-To-Repeat:
Found on ibus CI distcheck.
 https://github.com/tsutsui/ibus/actions/runs/5697830109/job/15445044420#step:4:2359

>Fix:
Prepare and install /usr/pkg/pkgconfig/liblzma.pc in NetBSD base from
src/external/public-domain/xz/dist/src/liblzma/liblzma.pc.in as zlib?

Put some workaround in pkgsrc for NetBSD?

---
Izumi Tsutsui