/usr/include/elementary-1/elm_notify_common.h is in libelementary-dev 1.8.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | #define ELM_NOTIFY_ALIGN_FILL -1.0 /**< Use with elm_notify_align_set() @since 1.8 */
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