Initial Arduino IDE based on Processing.

build/shared/lib/avrlib/conf/readme-conf.txt

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+
+--- AVRlib "conf" files ---
+
+AVRlib contains many function/code libraries which depend upon particular aspects of the
+user's hardware.  The most basic of these is the processor clock rate.  The clock rate defines
+dozens of aspects of processor operation from code delays to UART baud rates.
+
+To allow AVRlib to work easily with hardware that may vary from project to project, all
+user-configurable parameters of AVRlib are contained in the template configuration files in
+this directory.  NOTE that these files are only templates and should be copied, as needed,
+to an individual project's code directory and edited to suit that project's hardware.
+
+
+global.h is the only configuration include file that is common to the entire AVRlib code base.
+To use AVRlib libraries, you must copy global.h to your project's code directory and modify
+the options inside global.h to match your hardware.)  Each project should have its own global.h.
+
+Other *conf.h files should be copied to your project's code directory as needed.  For example,
+if you intend to use the lcd.c library, you will need to copy lcdconf.h and modify it to match
+the I/O and LCD configuration of your hardware.
+
+** If you fail to copy the configuration files needed for the AVRlib libraries you use,
+the problem will usually exhibit itself as a compile-time error.
+