Re: [Gimp-developer] webp format?

[Elle Stone <ellestone ninedegreesbelow com>]

On 08/22/2016 01:13 PM, Ben wrote:
> Hi Elle,
>
> Yes all the libs are required to make webp work and animation on works
> properly from 0.5.1+ and i used this to test builds for the plugin:
>
> ./configure --enable-libwebpmux --enable-libwebpdemux
> --enable-libwebpdecoder --enable-libwebpextras
>
> Only the first three should be really required.
>
> Ben

Ben, thanks! I finally got GIMP to compile with webp support.

Originally I had installed libwebp in /usr/local, without the 
above-listed options. But even after enabling the above-listed options 
and reinstalling, GIMP wouldn't compile - the build would fail when it 
got to the webp-save code, with the following terminal output:

file-webp-save.o: In function `WebPAnimEncoderOptionsInit':
/usr/local/include/webp/mux.h:454: undefined reference to 
`WebPAnimEncoderOptionsInitInternal'
file-webp-save.o: In function `save_animation':
build/gimp/plug-ins/file-webp/file-webp-save.c:494: undefined reference 
to `WebPAnimEncoderAdd'
build/gimp/plug-ins/file-webp/file-webp-save.c:512: undefined reference 
to `WebPAnimEncoderAdd'
build/gimp/plug-ins/file-webp/file-webp-save.c:514: undefined reference 
to `WebPAnimEncoderAssemble'
build/gimp/plug-ins/file-webp/file-webp-save.c:551: undefined reference 
to `WebPAnimEncoderDelete'
build/gimp/plug-ins/file-webp/file-webp-save.c:516: undefined reference 
to `WebPAnimEncoderGetError'
file-webp-save.o: In function `WebPAnimEncoderNew':
/usr/local/include/webp/mux.h:471: undefined reference to 
`WebPAnimEncoderNewInternal'

Uninstalling libwebp from /usr/local and installing it directly in the 
prefix in which GIMP is built allowed the build to finish, and now GIMP 
indeed can open and save webp files.

Does anyone know why GIMP couldn't find WebPAnimEncoder when libwebp was 
installed in /usr/local? Maybe I needed to tell GIMP to include 
/usr/local/lib or some such? Maybe something like this?
export PKG_CONFIG_PATH="$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig"

Best,
Elle