Re: [gentoo-user] Cannot build qtwebengine: ‘WEBP_EXTERN’ does not name a type

[Frank Steinmetzger]

On Mon, Apr 29, 2019 at 08:53:26AM +0100, Mick wrote:
> On Sunday, 28 April 2019 21:25:58 BST Frank Steinmetzger wrote:
> > Hi folks,
> >
> > it’s been a while since I had a problem for which I needed a nudge. :)
> > Due to some other lib upgrade, I need to rebuild qtwebengine.
> >
> > But it always fails with:
> > | In file included from
> > | ../../3rdparty/chromium/third_party/skia/src/images/SkWebpEncoder.cpp:42:
> > | /usreincnude/webp/mux.h:101:1: Since libpcap has been upgradederror:
> > | ‘WEBP_EXTERN’ does not name a type|
> > |  WEBP_EXTERN int WebPGetMuxVersion(void);
> > |  ^~~~~~~~~~~
> > |
> > | /usr/include/webp/mux.h: In function ‘WebPMux* WebPMuxCreate(const
> > | WebPData*, int)’: /usr/include/webp/mux.h:138:10: error:
> > | ‘WebPMuxCreateInternal’ was not declared in this scope|
> > |    return WebPMuxCreateInternal(bitstream, copy_data,
> > |    WEBP_MUX_ABI_VERSION);
> > |
> > |           ^~~~~~~~~~~~~~~~~~~~~
> >
> > And a number more of similar problems, hinting at a missing or broken
> > include file in libpcap. I tried upgrading libpcap from 1.8 to 1.9 as a
> > remedy, but no luck there.
>
> These are the libcap versions listed in my system and there is no 1.8 or 1.9
> versions here:

We both made a mistake here. Notice I mentioned libpcap (with two “p”s), you
only read one. And my mistake was to look at libpcap at all, when I should
have been looking at libwebp (oh those damn Ps). After all, that is the lib
which contains the culprit mux.h and which was upgraded from 0.5 to 1.0,
causing a rebuild in the first place. (In hindsight, why should a network
library have a file about muxing anyway).

I’ll try a libwebp downgrade now.

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