[oe] OT: cross compiling: `?=` or `+=` for `INCLUDES`

[Paul Menzel]

Dear OE folks,


what is the best practice for Makefiles with `INCLUDES`? On the VDR list
it was requested to use `+=` instead of `?=`. [1]

        However, in the Makefile changes:
        -INCLUDES = -I/usr/include/freetype2
        +INCLUDES ?= -I/usr/include/freetype2
        
        Shouldn't that be += instead of ?=.
        
        In my case, my IDE sets INCLUDES with some custom stuff. Therefore the
        Makefile does not touch INCLUDES any more and I get an error.

Is it common when changing `INCLUDES` that one has to take care about
this by oneself, i. e. by adding `-I/usr/include/freetype2` to
`INCLUDES`? Or is there a better way?


Thanks,

Paul


[1] http://www.linuxtv.org/pipermail/vdr/2010-November/023953.html
[2] http://www.linuxtv.org/pipermail/vdr/2010-December/024019.html
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