/home/runner/work/STIR/STIR/src/include/stir/HigherPrecision.h:18:9: warning: '__stir_HigherPrecision__H__' is used as a header guard here, followed by #define of a different macro [-Wheader-guard]
#ifndef __stir_HigherPrecision__H__
^~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/runner/work/STIR/STIR/src/include/stir/HigherPrecision.h:19:11: note: '_stir_HigherPrecision__H__' is defined here; did you mean '__stir_HigherPrecision__H__'?
# define _stir_HigherPrecision__H__