NAME
	  fglClearIndex	- specify the clear value for the color	index
	  buffers


     FORTRAN SPECIFICATION
	  SUBROUTINE fglClearIndex( REAL*4 c )


     PARAMETERS
	  c  Specifies the index used when the color index buffers are
	     cleared.  The initial value is 0.

     DESCRIPTION
	  fglClearIndex	specifies the index used by fglClear to	clear
	  the color index buffers.  c is not clamped.  Rather, c is
	  converted to a fixed-point value with	unspecified precision
	  to the right of the binary point.  The integer part of this
	  value	is then	masked with 2m-1, where	m is the number	of
	  bits in a color index	stored in the frame buffer.

     ERRORS
	  GL_INVALID_OPERATION is generated if fglClearIndex is
	  executed between the execution of fglBegin and the
	  corresponding	execution of fglEnd.

     ASSOCIATED	GETS
	  fglGet with argument GL_INDEX_CLEAR_VALUE
	  fglGet with argument GL_INDEX_BITS

     SEE ALSO
	  fglClear