C_INCLUDE_PATH
CPLUS_INCLUDE_PATH
OBJC_INCLUDE_PATH
Each variable's value is a list of directories separated by a spe-
cial character, much like PATH, in which to look for header files.
The special character, "PATH_SEPARATOR", is target-dependent and
determined at GCC build time. For Microsoft Windows-based targets
it is a semicolon, and for almost all other targets it is a colon.
CPATH specifies a list of directories to be searched as if speci-
fied with -I, but after any paths given with -I options on the com-
mand line. This environment variable is used regardless of which
language is being preprocessed.
The remaining environment variables apply only when preprocessing
the particular language indicated. Each specifies a list of direc-
tories to be searched as if specified with -isystem, but after any
paths given with -isystem options on the command line.
In all these variables, an empty element instructs the compiler to
search its current working directory. Empty elements can appear at
the beginning or end of a path.
For instance, if the value of
CPATH is ":/special/include", that has the same effect as
-I. -I/special/include.
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