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The fundamental search list for include files (read in via ‘@i’ or
‘@I’) is defined by the environment variable FWEB_INCLUDES
,
which is a colon-delimited list such as
setenv FWEB_INCLUDES .:/usr/fweb:/other/stuff
The ‘-I’ option appends to this list.
For information about include files, see ‘@i’: Include file (unconditional).