It relies upon a particular compiler - but you haven't stated what compiler.

#define I2C_DELAY 0x0F	                    // For delay i2c bus

What delay, exactly, is that supposed to produce?
It relies upon a certain clock frequency, and a certain number of clocks per instruction - neither of which you've stated.

void I2C_delay(void)
{
	unsigned char i;

	for(i=0; i<I2C_DELAY; i++);
}

The folly of HLL timing loops has already been explained - twice:
http://www.8052.com/forum/read/182476
http://www.8052.com/forum/read/182488

Note also that this loop is likely to be optimised-out

#define	    sda     P0_0                     // Serial data pin
#define	    scl     P0_1                     // Serial clock pin

#define	    set_sda     (P0_0=0x01)          // Set Serial data pin
#define	    set_scl     (P0_1=0x01)          // Set Serial clock pin

#define	    clr_sda     (P0_0=0x00)          // Clear Serial data pin
#define	    clr_scl     (P0_1=0x00)          // Clear Serial clock pin

It is conventional to use UPPERCASE for 'C' macros.

Why do your set/clear macros not use your sda and scl definitions?

set_scl;		// Set SCL 

With a name like set_scl, a comment, "Set SCL" adds no value.

#ifndef IC2_h
#define IC2_h

What is that for?