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Header files are specified by the ‘HEADERS’ family of variables.
Generally header files are not installed, so the noinst_HEADERS
variable will be the most used. 7
All header files must be listed somewhere; missing ones will not appear in the distribution. Often it is clearest to list uninstalled headers with the rest of the sources for a program. See Building a program. Headers listed in a ‘_SOURCES’ variable need not be listed in any ‘_HEADERS’ variable.
Headers can be installed in includedir, oldincludedir, or
pkgincludedir.
However, for the case of a
non-installed header file that is actually used by a particular program,
we recommend listing it in the program’s ‘_SOURCES’ variable
instead of in noinst_HEADERS. We believe this is more clear.