671672 – =media-libs/opencv-3.4.1-r4[png] fails to build because of wrong png header location

Bug 671672 - =media-libs/opencv-3.4.1-r4[png] fails to build because of wrong png header location

Summary: =media-libs/opencv-3.4.1-r4[png] fails to build because of wrong png header l...

Status:	RESOLVED OBSOLETE

Alias:	None

Product:	Gentoo Linux
Classification:	Unclassified
Component:	Current packages (show other bugs)
Hardware:	All Linux

Importance:	Normal normal (vote)
Assignee:	Amy Liffey

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Reported:	2018-11-22 06:52 UTC by Vadim A. Misbakh-Soloviov (mva)
Modified:	2019-01-14 10:31 UTC (History)
CC List:	1 user (show)

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Runtime testing required:	---

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Description Vadim A. Misbakh-Soloviov (mva) gentoo-dev

2018-11-22 06:52:49 UTC

Hi there!
I found that if I enable "png" use-flag on =media-libs/opencv-3.4.1-r4 it fails to build.

```
...
/var/tmp/portage/media-libs/opencv-3.4.1-r4/work/opencv-3.4.1/modules/imgcodecs/src/grfmt_png.cpp:62:10: fatal error: libpng/png.h: No such file or directory
 #include <libpng/png.h>
          ^~~~~~~~~~~~~~
compilation terminated.

```
Actual png.h header is placed in `libpng16/` directory, but not in `libpng/`.

Comment 1 Vadim A. Misbakh-Soloviov (mva) gentoo-dev

2019-01-14 10:31:58 UTC

 as of -r5 (and actual cmake version), it builds fine now...

I guess, it was cmake version-specific error...