mk_check_header — Check for a header
MODULES="... compiler ..."
mk_check_header HEADER=header
HEADERDEPS=headers
Specifies additional headers which might be needed in order for header to be compilable. If a header has been determined to be unavailable by a previous mk_check_headers, it will be silently omitted from this list as a convenience.
Checks for the availability of a system header and sets
result to the result. If the header was found
on the system, the result will be "external". If the header
is provided by mk_headers within the current
project, the result will be "internal". Otherwise, the result
will be "no".