我在使用GStreamer构建QtMultimedia时遇到问题：
user@user-VirtualBox:~/sources/qt/build$ /usr/local/Qt-5.12.1/bin/qmake -r GST_VERSION=1.0 ../qt-everywhere-src-5.12.1/qtmultimedia/qtmultimedia.pro
Info: creating stash file /home/user/sources/qt/build/.qmake.stash
Info: creating cache file /home/user/sources/qt/build/.qmake.cache
Running configuration tests...
Checking for ALSA... no
Checking for GStreamer 1.0... yes
Checking for GStreamer App 1.0... yes
Checking for GStreamer encoding-profile.h... yes
Checking for GStreamer Photography 1.0... no
Checking for Video for Linux... yes
Checking for OpenAL... no
Checking for PulseAudio >= 0.9.10... no
Checking for libresourceqt5... no
Done running configuration tests.
Configure summary:
Qt Multimedia:
ALSA ................................... no
GStreamer 1.0 .......................... yes
GStreamer 0.10 ......................... no
Video for Linux ........................ yes
OpenAL ................................. no
PulseAudio ............................. no
Resource Policy (libresourceqt5) ....... no
Windows Audio Services ................. no
DirectShow ............................. no
Windows Media Foundation ............... no
Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/usr/local/Qt-5.12.1'.
Prior to reconfiguration, make sure you remove any leftovers from
the previous build.
Reading /home/user/sources/qt/qt-everywhere-src-5.12.1/qtmultimedia/src/src.pro [/home/user/sources/qt/build/src]
Reading /home/user/sources/qt/qt-everywhere-src-5.12.1/qtmultimedia/src/multimedia/multimedia.pro [/home/user/sources/qt/build/src/multimedia]
Reading /home/user/sources/qt/qt-everywhere-src-5.12.1/qtmultimedia/src/qtmultimediaquicktools/qtmultimediaquicktools.pro [/home/user/sources/qt/build/src/qtmultimediaquicktools]
Reading /home/user/sources/qt/qt-everywhere-src-5.12.1/qtmultimedia/src/imports/imports.pro [/home/user/sources/qt/build/src/imports]
Reading /home/user/sources/qt/qt-everywhere-src-5.12.1/qtmultimedia/src/imports/multimedia/multimedia.pro [/home/user/sources/qt/build/src/imports/multimedia]
Reading /home/user/sources/qt/qt-everywhere-src-5.12.1/qtmultimedia/src/multimediawidgets/multimediawidgets.pro [/home/user/sources/qt/build/src/multimediawidgets]
Reading /home/user/sources/qt/qt-everywhere-src-5.12.1/qtmultimedia/src/gsttools/gsttools.pro [/home/user/sources/qt/build/src/gsttools]
Project ERROR: Library 'gstreamer' is not defined.
我相信我已经安装了所有必需的GStreamer组件，但似乎未找到GStreamer库。有什么想法吗？
操作系统： Ubuntu 16.04
已安装与 GStreamer 相关的软件包：
gir1.2-gst-plugins-bad-1.0 / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gir1.2-gst-plugins-base-0.10 / xenial-updates，xenial-security，现在为0.10.36-2ubuntu0.1 i386 [已安装]
gir1.2-gst-plugins-base-1.0 / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gir1.2-gstreamer-0.10 / xenial，现在为0.10.36-1.5ubuntu1 i386 [已安装，自动]
gir1.2-gstreamer-1.0 / xenial-updates，现在为1.8.3-1〜ubuntu0.1 i386 [已安装]
gstreamer-qapt / xenial-updates，现在是3.0.2-0ubuntu1.2 i386 [已安装，自动]
gstreamer0.10-alsa / xenial-updates，xenial-security，现在为0.10.36-2ubuntu0.1 i386 [已安装]
gstreamer0.10-doc / xenial，现在是0.10.36-1.5ubuntu1全部[已安装]
gstreamer0.10-gconf / xenial-updates，xenial-security，现在为0.10.31-3 + nmu4ubuntu2.16.04.3 i386 [已安装]
gstreamer0.10-gnomevfs / xenial-updates，xenial-security，现在为0.10.36-2ubuntu0.1 i386 [已安装]
gstreamer0.10-nice / xenial，现在为0.1.13-0ubuntu2 i386 [已安装]
gstreamer0.10-plugins-base / xenial-updates，xenial-security，现在为0.10.36-2ubuntu0.1 i386 [已安装]
gstreamer0.10-plugins-base-apps / xenial-updates，xenial-security，现在为0.10.36-2ubuntu0.1 i386 [已安装]
gstreamer0.10-plugins-base-dbg / xenial-updates，xenial-security，现在为0.10.36-2ubuntu0.1 i386 [已安装]
gstreamer0.10-plugins-base-doc / xenial-updates，xenial-security，现在0.10.36-2ubuntu0.1全部[已安装]
gstreamer0.10-plugins-good / xenial-updates，xenial-security，现在为0.10.31-3 + nmu4ubuntu2.16.04.3 i386 [已安装]
gstreamer0.10-plugins-good-dbg / xenial-updates，xenial-security，现在为0.10.31-3 + nmu4ubuntu2.16.04.3 i386 [已安装]
gstreamer0.10-plugins-good-doc / xenial-updates，xenial-security，现在0.10.31-3 + nmu4ubuntu2.16.04.3全部[已安装]
gstreamer0.10-pulseaudio / xenial-updates，xenial-security，现在为0.10.31-3 + nmu4ubuntu2.16.04.3 i386 [已安装]
gstreamer0.10-qapt / xenial-updates，现在3.0.2-0ubuntu1.2全部[已安装]
gstreamer0.10-tools / xenial，现在为0.10.36-1.5ubuntu1 i386 [已安装]
gstreamer0.10-x / xenial-updates，xenial-security，现在为0.10.36-2ubuntu0.1 i386 [已安装]
gstreamer1.0-alsa / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-clutter / xenial，现在为2.0.18-1 i386 [已安装]
gstreamer1.0-clutter-3.0 / xenial，现在是3.0.18-1 i386 [已安装]
gstreamer1.0-crystalhd / xenial，现在为1：0.0〜git20110715.fdd2f19-11build1 i386 [已安装]
gstreamer1.0-doc / xenial-updates，现在是1.8.3-1〜ubuntu0.1全部[已安装]
gstreamer1.0-dvswitch / xenial，现在为0.1.1-1 i386 [已安装]
gstreamer1.0-espeak / xenial，现在是0.4.0-1 i386 [已安装]
gstreamer1.0-fluendo-mp3 / xenial，现在为0.10.32.debian-1 i386 [已安装]
gstreamer1.0-hybris / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-libav / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-libav-dbg / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-nice / xenial，现在为0.1.13-0ubuntu2 i386 [已安装]
gstreamer1.0-packagekit / xenial-updates，现在为0.8.17-4ubuntu6〜gcc5.4ubuntu1.4 i386 [已安装]
gstreamer1.0-plugins-bad / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-plugins-bad-dbg / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-plugins-bad-doc / xenial-updates，现在是1.8.3-1ubuntu0.2全部[已安装]
gstreamer1.0-plugins-bad-faad / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-plugins-bad-videoparsers / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-plugins-base / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-plugins-base-apps / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-plugins-base-dbg / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.2 i386 [已安装]
gstreamer1.0-plugins-base-doc / xenial-updates，xenial-security，现在1.8.3-1ubuntu0.2全部[已安装]
gstreamer1.0-plugins-good / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.4 i386 [已安装]
gstreamer1.0-plugins-good-dbg / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.4 i386 [已安装]
gstreamer1.0-plugins-good-doc / xenial-updates，xenial-security，现在1.8.3-1ubuntu0.4全部[已安装]
gstreamer1.0-plugins-ugly / xenial-updates，现在为1.8.3-1ubuntu0.1 i386 [已安装]
gstreamer1.0-plugins-ugly-amr / xenial-updates，现在为1.8.3-1ubuntu0.1 i386 [已安装]
gstreamer1.0-plugins-ugly-dbg / xenial-updates，现在为1.8.3-1ubuntu0.1 i386 [已安装]
gstreamer1.0-plugins-ugly-doc / xenial-updates，现在是1.8.3-1ubuntu0.1全部[已安装]
gstreamer1.0-pocketsphinx / xenial，现在为0.8.0 + real5prealpha-1ubuntu2 i386 [已安装]
gstreamer1.0-pulseaudio / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.4 i386 [已安装]
gstreamer1.0-tools / xenial-updates，现在为1.8.3-1〜ubuntu0.1 i386 [已安装]
gstreamer1.0-vaapi / xenial-updates，现在为1.8.3-1〜ubuntu0.1 i386 [已安装]
gstreamer1.0-vaapi-doc / xenial-updates，现在是1.8.3-1〜ubuntu0.1全部[已安装]
gstreamer1.0-x / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.2 i386 [已安装]
libclutter-gst-3.0-0 / xenial，现在是3.0.18-1 i386 [已安装]
libgstreamer-plugins-bad1.0-0 / xenial-updates，现在为1.8.3-1ubuntu0.2 i386 [已安装，自动]
libgstreamer-plugins-base0.10-0 / xenial-updates，xenial-security，现在为0.10.36-2ubuntu0.1 i386 [已安装，自动]
libgstreamer-plugins-base1.0-0 / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.2 i386 [已安装]
libgstreamer-plugins-base1.0-dev / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.2 i386 [已安装]
libgstreamer-plugins-good1.0-0 / xenial-updates，xenial-security，现在为1.8.3-1ubuntu0.4 i386 [已安装]
libgstreamer0.10-0 / xenial，现在为0.10.36-1.5ubuntu1 i386 [已安装，自动]
libgstreamer0.10-dev / xenial，现在为0.10.36-1.5ubuntu1 i386 [已安装，自动]
libgstreamer1.0-0 / xenial-updates，现在为1.8.3-1〜ubuntu0.1 i386 [已安装]
libgstreamer1.0-0-dbg / xenial-updates，现在为1.8.3-1〜ubuntu0.1 i386 [已安装]
libgstreamer1.0-dev / xenial-updates，现在为1.8.3-1〜ubuntu0.1 i386 [已安装]
libqt5gstreamer-1.0-0 / xenial，现在是1.2.0-3 i386 [已安装]
libqtgstreamer-1.0-0 / xenial，现在为1.2.0-3 i386 [已安装]
libreoffice-avmedia-backend-gstreamer / xenial-updates，xenial-security，现在为1：5.1.6〜rc2-0ubuntu1〜xenial6 i386 [已安装]