Hello,
I am trying to build Qt 5.10.1 on Slackware64 14.2 with the
"-system-webengine-webp" option and libwebp 0.6.1:
---
$ ./configure -v \
[...]
-system-assimp \
-system-doubleconversion \
-system-freetype \
-system-harfbuzz \
-system-libjpeg \
-system-libpng \
-system-pcre \
-system-sqlite \
-system-xcb \
-system-webengine-icu \
-system-webengine-ffmpeg \
-system-webengine-opus \
-system-webengine-webp \
-system-zlib \
[...]
-pulseaudio
[...]
Note: Also available for Linux: linux-clang linux-icc
Note: -headerdir is not a subdirectory of -prefix.
Note: -libdir is not a subdirectory of -prefix.
Note: -docdir is not a subdirectory of -prefix.
Note: -optimized-tools is not useful in -release mode.
Note: Dropped compiler flags '-pthread' when detecting library 'glib'.
Note: Dropped compiler flags '-pthread' when detecting library 'gtk3'.
Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.
Note: Dropped compiler flags '-pthread' when detecting library 'gstreamer'.
Note: Dropped compiler flags '-pthread' when detecting library 'gstreamer_app'.
Note: Dropped compiler flags '-pthread' when detecting library
'webengine-protobuf'.
ERROR: Feature 'webengine-system-libwebp' was enabled, but the pre-condition
'libs.webengine-webp' failed.
ERROR: Feature 'webengine-system-ffmpeg' was enabled, but the pre-condition
'libs.webengine-ffmpeg && features.webengine-system-opus &&
features.webengine-system-libwebp' failed.
---
As you can see in the output above, the error is about the libwebp library that
is not found (or at least that is not working correctly).
However, I found the test file that is checking the libwebp library and I tried
it manually:
---
$ cd qtimageformats/config.tests/libwebp
$ qmake libwebp.pro
$ make
g++ -c -pipe -O2 -Wall -W -I/usr/lib64/qt/mkspecs/linux-g++ -I. -o libwebp.o
libwebp.cpp
libwebp.cpp: In function ‘int main(int, char**)’:
libwebp.cpp:40:20: warning: unused variable ‘output_buffer’ [-Wunused-variable]
WebPDecBuffer *output_buffer = &config.output;
^~~~~~~~~~~~~
libwebp.cpp:41:28: warning: unused variable ‘bitstream’ [-Wunused-variable]
WebPBitstreamFeatures *bitstream = &config.input;
^~~~~~~~~
libwebp.cpp:42:17: warning: variable ‘picture’ set but not used
[-Wunused-but-set-variable]
WebPPicture picture;
^~~~~~~
libwebp.cpp:44:16: warning: variable ‘config2’ set but not used
[-Wunused-but-set-variable]
WebPConfig config2;
^~~~~~~
libwebp.cpp:47:18: warning: unused variable ‘demuxer’ [-Wunused-variable]
WebPDemuxer *demuxer = WebPDemux(&data);
^~~~~~~
libwebp.cpp:48:18: warning: variable ‘iter’ set but not used
[-Wunused-but-set-variable]
WebPIterator iter;
^~~~
---
So, the test file is working.
I am able to build it manually.
Why the Qt build system is complaining about this library installed on my
system please?
Thank you.
Best regards.
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