I suggest that
a) $HOME/.local/include is effectively added to the
include_directories, as if it were inserted in
default_include_directories before /usr/gnu/include.
b) Change function src/read.c/eval_makefile() to loop over
.INCLUDE_DIRS instead of include_directories when searching for
Rationale for a):
The $HOME/.local directory tree is a directory tree established
besides /usr and /usr/local for user-installed software.
By supporting $HOME/.local/include as a default include directory,
users of make could share modules by "installing" them into their
$HOME/.local/include directory without needing administrator
privileges (required for installing in /usr/include or
/usr/local/include or /usr/gnu/include), and without appending -I
~/.local/include to the make call.
This feature looks portable:
* The entry $HOME/.local/include can be assumed on all POSIXy systems.
* On Windows, there is a corresponding directory, I can create a VM if
the details are needed.
* On Amiga OS, the variable $HOME is optional and usually only set if
something like MuFS or GNU is used in an extended configuration. Make
could check if $HOME is set and include the entry based on that
Rationale for b):
has no effect and does not print any error message, which is not
friendly towards users of make.
Something should either work, or when it doesn't, it should print an
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