pkg/52880: No rpath in *.pc files for pkgsrc/multimedia/ffmpeg3 3.4.1

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

>Number:         52880
>Category:       pkg
>Synopsis:       No rpath in *.pc files for pkgsrc/multimedia/ffmpeg3 3.4.1
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 31 04:15:00 +0000 2017
>Originator:     Izumi Tsutsui
>Release:        NetBSD 7.1.1 + pkgsrc-2017Q4
>Organization:
>Environment:
System: NetBSD 7.1.1
Architecture: x86_64
Machine: amd64
>Description:
ffmpeg3-3.4.1 package built from pkgsrc-2017Q4 seems to have
no rpath definitions in /usr/pkg/lib/ffmpeg3/pkgconfig/*.pc files:

---
% grep Libs: /usr/pkg/lib/ffmpeg3/pkgconfig/*.pc
/usr/pkg/lib/ffmpeg3/pkgconfig/libavcodec.pc:Libs: -L${libdir}  -lavcodec 
/usr/pkg/lib/ffmpeg3/pkgconfig/libavdevice.pc:Libs: -L${libdir}  -lavdevice 
/usr/pkg/lib/ffmpeg3/pkgconfig/libavfilter.pc:Libs: -L${libdir}  -lavfilter 
/usr/pkg/lib/ffmpeg3/pkgconfig/libavformat.pc:Libs: -L${libdir}  -lavformat 
/usr/pkg/lib/ffmpeg3/pkgconfig/libavresample.pc:Libs: -L${libdir}  -lavresample 
/usr/pkg/lib/ffmpeg3/pkgconfig/libavutil.pc:Libs: -L${libdir}  -lavutil 
/usr/pkg/lib/ffmpeg3/pkgconfig/libpostproc.pc:Libs: -L${libdir}  -lpostproc 
/usr/pkg/lib/ffmpeg3/pkgconfig/libswresample.pc:Libs: -L${libdir}  -lswresample 
/usr/pkg/lib/ffmpeg3/pkgconfig/libswscale.pc:Libs: -L${libdir}  -lswscale
---

so packages which link ffmpeg3 libraries will fail on "make package":
---
ERROR: bin/PC6001VX: missing library: libavformat.so.57
---

ffmpeg3-3.3.4 from pkgsrc-2017Q3 doesn't have this problem.

>How-To-Repeat:
# cd pkgsrc/multimedia/ffmpeg3
# make package-install
# grep Libs: /usr/pkg/lib/ffmpeg3/pkgconfig/*.pc

>Fix:
Add the following line to pkgsrc/multimedia/ffmpeg3/Makefile ?

CONFIGURE_ARGS+=	--enable-rpath

---
Izumi Tsutsui