The compile-time environment variables are:
FPATH
The path for include and module files.
IFORTCFG
The configuration file to use instead of the default configuration
file.
LD_LIBRARY_PATH
The path for shared (.so) library files.
PATH
The path for compiler executable files.
TMP,
TMPDIR, TEMP
Specifies the directory in which to store temporary files. See Temporary Files Created
by the Compiler or Linker.