/usr/include/allegro/platform/alplatf.h is in liballegro4-dev 2:4.4.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | /* #undef ALLEGRO_BCC32 */
/* #undef ALLEGRO_BEOS */
/* #undef ALLEGRO_DJGPP */
/* #undef ALLEGRO_DMC */
/* #undef ALLEGRO_HAIKU */
/* #undef ALLEGRO_MACOSX */
/* #undef ALLEGRO_MINGW32 */
/* #undef ALLEGRO_MPW */
/* #undef ALLEGRO_MSVC */
/* #undef ALLEGRO_PSP */
/* #undef ALLEGRO_QNX */
#define ALLEGRO_UNIX
/* #undef ALLEGRO_WATCOM */
/* These are always defined now. */
#define ALLEGRO_NO_ASM
#define ALLEGRO_USE_C
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