ATtiny85 - enabling global interrupts with the SREG register instead of assembly

main.c

...
// Add the SREG register
#define SREG REG(0x3F)
...

int main()
{
  ...
  // Write 1 to bit 7 (I-bit) for Global Interrupt Enable
  SREG |= BV_MASK(7);
  ...
}