The header <math.h> is not required to build lib/sfio, so the check and
the usage can be removed.
# Converted to sfio v10/01/94 by Giampiero Sierra (06/08/95).
##################################################################
-hdr math
lib qfrexp
lib qldexp
#undef _hdr_vfork
#undef _sys_vfork
#undef _lib_vfork
-#undef _hdr_math
#undef _sys_mman
#undef _sys_ioctl
#endif
#define remove unlink
#endif
-#if _hdr_math
-#include <math.h>
-#endif
-
#if !defined(_ast_fltmax_double)
#if defined(_lib_qfrexp) && _lib_qldexp
#ifndef _def_time_Sfio_f
#define _def_time_Sfio_f 1
#define _sys_types 1 /* #include <sys/types.h> ok */
-#define _hdr_math 1 /* #include <math.h> ok */
//#define _hdr_unistd 1 /* #include <unistd.h> ok */
#define _lib_ftruncate 0 /* ftruncate() in default lib(s) */
#define _lib_lseek64 1 /* lseek64() in default lib(s) */