我正在尝试构建Parrot SDK，并且在运行命令时，由于找不到多个libav软件包变体，该命令连续失败。下面是错误消息。
user@TheMysteriousMachine:~/WORKING_DIRECTORY$ ./build.sh -p arsdk-native -t build-sdk -j
[I] Starting task 'build-sdk'
[I] In '/home/user/WORKING_DIRECTORY': ALCHEMY_TARGET_CONFIG_DIR="/home/user/WORKING_DIRECTORY/products/arsdk /native/config" ALCHEMY_TARGET_OUT="/home/user/WORKING_DIRECTORY/out/arsdk-native" ALCHEMY_TARGET_PRODUCT="arsdk" ALCHEMY_TARGET_PRODUCT_VARIANT="native" ALCHEMY_TARGET_SCAN_ADD_DIRS=" /home/user/WORKING_DIRECTORY/packages" ALCHEMY_TARGET_SCAN_PRUNE_DIRS=" /home/user/WORKING_DIRECTORY" ALCHEMY_USE_COLORS="1" ALCHEMY_WORKSPACE_DIR="/home/user/WORKING_DIRECTORY" PARROT_BUILD_PROP_GROUP="drones" PARROT_BUILD_PROP_PRODUCT="arsdk" PARROT_BUILD_PROP_PROJECT="arsdk" PARROT_BUILD_PROP_UID="arsdk-native-20190316-1404-0.0.0" PARROT_BUILD_PROP_VARIANT="native" PARROT_BUILD_PROP_VERSION="0.0.0" /home/user/WORKING_DIRECTORY/build/alchemy/scripts/alchemake -j 8 all
----------------------------------------------------------------------
+ ALCHEMY_WORKSPACE_DIR = /home/user /WORKING_DIRECTORY
+ TARGET_PRODUCT = arsdk
+ TARGET_PRODUCT_VARIANT = native
+ TARGET_OS = linux
+ TARGET_OS_FLAVOUR = native
+ TARGET_LIBC = native
+ TARGET_ARCH = x64
+ TARGET_CPU =
+ TARGET_OUT = /home/user/WORKING_DIRECTORY/out/arsdk-native
+ TARGET_CONFIG_DIR = /home/user/WORKING_DIRECTORY /products/arsdk/native/config
+ TARGET_CC_PATH = /usr/bin/cc
+ TARGET_CC_VERSION = 7
----------------------------------------------------------------------
Scanning /home/user/WORKING_DIRECTORY/packages for makefiles...
Found 44 makefiles
Prebuilt module ncurses marked as overriden
Prebuilt module ncurses marked as overriden
Package libavcodec was not found in the pkg-config search path.
Perhaps you should add the directory containing libavcodec.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libavcodec' found
Package libavformat was not found in the pkg-config search path.
Perhaps you should add the directory containinglibavformat.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libavformat' found
Package libswscale was not found in the pkg-config search path.
Perhaps you should add the directory containing libswscale.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libswscale' found
Package libavutil was not found in the pkg-config search path.
Perhaps you should add the directory containinglibavutil.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libavutil' found
Package libavcodec was not found in the pkg-config search path.
Perhaps you should add the directory containing libavcodec.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libavcodec' found
Package libavformat was not found in the pkg-config search path.
Perhaps you should add the directory containinglibavformat.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libavformat' found
Package libswscale was not found in the pkg-config search path.
Perhaps you should add the directory containing libswscale.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libswscale' found
Package libavutil was not found in the pkg-config search path.
Perhaps you should add the directory containinglibavutil.pc'
to the PKG_CONFIG_PATH environment variable
No package 'libavutil' found
Found 96 modules
Computing modules dependencies...
Checking modules dependencies...
/home/user/WORKING_DIRECTORY/build/alchemy/main.mk:360: *** /home/user /WORKING_DIRECTORY/packages/libARDiscovery: module 'libARDiscovery' depends on unknown module 'avahi'. Stop.
[E] Task 'build-sdk' failed (Command failed (returncode=2))
据我了解，libav已被ffmpeg取代，但构建仍应能够将软件包引用为libav。我尝试使用`export PKG_CONFIG_PATH = ...'将不同的路径添加到PKG_CONFIG_PATH，但是没有成功。我可能没有添加正确的路径，所以我使用了'dpkg -L ffmpeg'来找到软件包。输出为：
user@TheMysteriousMachine:~$ dpkg -L ffmpeg
/.
/etc
/etc/ffserver.conf
/usr
/usr/bin
/usr/bin/ffmpeg
/usr/bin/ffplay
/usr/bin/ffprobe
/usr/bin/ffserver
/usr/bin/qt-faststart
/usr/share
/usr/share/doc
/usr/share/doc/ffmpeg
/usr/share/doc/ffmpeg/RELEASE_NOTES
/usr/share/doc/ffmpeg/copyright
/usr/share/ffmpeg
/usr/share/ffmpeg/libvpx-1080p.ffpreset
/usr/share/ffmpeg/libvpx-1080p50_60.ffpreset
/usr/share/ffmpeg/libvpx-360p.ffpreset
/usr/share/ffmpeg/libvpx-720p.ffpreset
/usr/share/ffmpeg/libvpx-720p50_60.ffpreset
/usr/share/lintian
/usr/share/lintian/overrides
/usr/share/lintian/overrides/ffmpeg
/usr/share/man
/usr/share/man/man1
/usr/share/man/man1/ffmpeg-all.1.gz
/usr/share/man/man1/ffmpeg-bitstream-filters.1.gz
/usr/share/man/man1/ffmpeg-codecs.1.gz
/usr/share/man/man1/ffmpeg-devices.1.gz
/usr/share/man/man1/ffmpeg-filters.1.gz
/usr/share/man/man1/ffmpeg-formats.1.gz
/usr/share/man/man1/ffmpeg-protocols.1.gz
/usr/share/man/man1/ffmpeg-resampler.1.gz
/usr/share/man/man1/ffmpeg-scaler.1.gz
/usr/share/man/man1/ffmpeg-utils.1.gz
/usr/share/man/man1/ffmpeg.1.gz
/usr/share/man/man1/ffplay-all.1.gz
/usr/share/man/man1/ffplay.1.gz
/usr/share/man/man1/ffprobe-all.1.gz
/usr/share/man/man1/ffprobe.1.gz
/usr/share/man/man1/ffserver-all.1.gz
/usr/share/man/man1/ffserver.1.gz
/usr/share/man/man1/qt-faststart.1.gz
/usr/share/doc/ffmpeg/changelog.Debian.gz
...我可以假设其中有用的部分是“ / usr / bin”，我将其添加到我的PKG_CONFIG_PATH中，并且在构建时仍然出现相同的错误。我正在运行Ubuntu 18.04 LTS。我很茫然，在过去的两天里一直在为此工作，任何帮助都将得到伟大的赞赏。谢谢您，我很乐意提供更多所需的信息。作为一个小小的要求，我对Linux还是很陌生的，因此，如果您可以在命令行操作中包含尽可能多的详细信息，这将对 alot 。有帮助。
答案 0 :(得分：0)
假设您遵循了FFmpeg Ubuntu编译指南：https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
您要查找的路径必须在这里：PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig