LSAME LOGICAL Test if two characters are the same regardless of case
SLAMCH REAL Determine machine-dependent parameters
DLAMCH DOUBLE PRECISION Determine machine-dependent parameters
SECOND REAL Return time in seconds from a fixed starting time
DSECND DOUBLE PRECISION Return time in seconds from a fixed starting time
ILAENV INTEGER Checks that NaN and infinity arithmetic are IEEE-754 compliant
If you are working only in single precision, you do not need to install DLAMCH and DSECND, and if you are working only in double precision, you do not need to install SLAMCH and SECOND. These five subroutines and their test programs are provided in the files LSAMEF and TLSAMEF, SLAMCHF and TSLAMCHF, etc.