Apply #ifdef/#ifndef where possible
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@ -58,7 +58,7 @@
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#define SPI_2XCLOCK_MASK 0x01 // SPI2X = bit 0 on SPSR
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// define SPI_AVR_EIMSK for AVR boards with external interrupt pins
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#if defined(EIMSK)
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#ifdef EIMSK
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#define SPI_AVR_EIMSK EIMSK
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#elif defined(GICR)
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#define SPI_AVR_EIMSK GICR
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