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build: opencv: disable opencv deps if it's not installed
When hotdoc documentation is enabled and opencv plugin is set as auto-detected, but the library isn't installed, meson configuration fails with this message: ../subprojects/gst-plugins-bad/docs/meson.build:139:21: ERROR: Unknown variable "gstopencv_dep". This patch fixes this case defined gstopencv_dep as disabler() when dependencies aren't found. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5560>
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@ -97,4 +97,6 @@ if opencv_found
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install_headers(opencv_headers, subdir : 'gstreamer-1.0/gst/opencv')
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elif get_option('opencv').enabled()
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error('OpenCV support enabled but required dependencies were not found.')
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else
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gstopencv_dep = disabler()
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endif
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