Development files for GStreamer streaming media framework
The gstreamer1-devel package includes the libraries, header files, etc., that you'll need to develop applications that are linked with the gstreamer1 extensibility library.
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GStreamer Base Plugins Development files
This package contains static libraries and header files.
Package compiler and linker metadata toolkit
pkgconf is a program which helps to configure compiler and linker flags for development frameworks. It is similar to pkg-config from freedesktop.org, providing additional functionality while also maintaining compatibility.
The Farstream (formerly Farsight) project is an effort to create a framework to deal with all known audio/video conferencing protocols.