Documentation for the libegl1-x11, libgles1, and libgles2 virtual
packages.

Although there are is no standardised linux ABI for GL|ES, there is
a “strongly encouraged” set of standard headers, type and linkage definitions
supplied by the Khronos group[1].  The mesa implementation provides this ABI.
Any non-mesa implementation that wants to provide these packages should
conform to the Khronos group's de-facto ABI.

The case of EGL is similar; Khronos again supplies a de-facto linux ABI.
The EGL ABI is necessarily tied to the native windowing system by the
eglNativeDisplayType, eglNativeWindowType, and eglNativePixmapType typedefs.
The EGL virtual package therefore includes the name of the x11 windowing
system to leave room should further windowing ABIs be standardised.

[1]: http://www.khronos.org/registry/implementers_guide.html#uncontrolled

 -- Cyril Brulebois <kibi@debian.org>, Sat, 22 Jan 2011 06:03:46 +0100