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external/packages/extras-buildpkgs/README.md

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+# Requirements
+
+* Xenial build host
+
+* Extra 5GB of disk space
+
+# Limitations
+
+* Packages are built only for Jessie, Xenial and Stretch targets, installing on older distributions may be done manually if dependencies can be satisfied
+
+# TODO
+
+### Process
+
+* Switch from qemu & distcc to multiarch cross-compiling if possible
+
+### Package-specific:
+
+* libvdpau-sunxi: select branch (master or dev)
+
+## Notes
+
+libcedrus compiled without USE_UMP=1 requires access to /dev/ion
+
+libcedrus compiled with USE_UMP=1 caused segfault last time I tested video playback with mpv
+
+libmali-sunxi-r3p0 contains *.so symlinks (instead of libmali-sunxi-dev) to help searching libraries by SONAME for libMali.so
+
+libmali-sunxi-r3p0 is packaged differently for [Debian](https://www.debian.org/doc/debian-policy/ap-pkg-diversions.html) and [Ubuntu](https://wiki.ubuntu.com/X/EGLDriverPackagingHOWTO)
+
+libglshim1 is installed to private directory (`/usr/lib/arm-linux-gnueabihf/glshim`) and can be activated by using LD_LIBRARY_PATH