freedesktop.cairo

// cairo, via its MODULE — and this is the route that had never been checked.
//
// ⭐ WHY THIS FILE EXISTS
//
// The package exposed `import freedesktop.cairo;` and the only test that named
// it also wrote `#include <cairo.h>`. So the header supplied whatever the
// module lacked, and what it lacked was substantial:
//
//     470 names exported, and among the missing:
//       cairo_t              the single most-used type in the library
//       192 enumerators      every CAIRO_FORMAT_*, CAIRO_STATUS_*, CAIRO_OPERATOR_*
//
// It was found from OUTSIDE, by gnome.pangocairo — which cannot mix the two
// routes (pangocairo.h reaches glib and therefore <stdio.h>, so a textual
// include alongside the import makes `struct _IO_FILE` two entities) and
// therefore had to ask the module for `cairo_t` and got nothing.
//
// This file includes NOTHING. That is the whole point: if a name is missing
// from the module, this fails to compile.

#ifdef __linux__

// …