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sketch_jan29a:4: error: 'IRsend' does not name a type sketch_jan29a.ino: In function 'void setup()': sketch_jan29a:14: error: 'irsend' was not declared in this scope

also restart the IDE after coping the library into the above mentioned folder, so that IDE knows about it. mpflaga Jan 28, 2014 at 14:19

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