2.3 Conditional code in the MOLPRO environment

Within the MOLPRO environment, ftc is called automatically by the ftn compilation script, which is in turn called automatically from make files. A number of flags are defined, including molpro, and those in the ARCHITECTURE and FTCFLAGS definitions in CONFIG. If, for example when developing new code, it is desired to activate new flags, ftn may be called directly with -D or -U options, which are passed through to ftc.