Package: autoconf-doc
Version: 2.59-1

The documentation says the following:

>  - Macro: AC_PATH_XTRA ([LIBRARY = `Xt'], [HEADER-FILE =
>           `X11/Intrinsic.h'], [FUNCTION-CALL = `XtMalloc (0)'])
>      An enhanced version of `AC_PATH_X'.  It adds the C compiler flags
>      that X needs to output variable `X_CFLAGS', and the X linker flags
>      to `X_LIBS'.  Define `X_DISPLAY_MISSING' if X is not available.
> 
>      This macro checks that FUNCTION-CALL compiles when HEADER is
>      included and that the resulting executable links against LIBRARY.

But when I didn't have libxt-dev (containing /usr/include/X11/Intrinsic.h) 
installed, this test suceeded anyways.
>From poking around a generated configure script, I think the situation is that 
AC_PATH_XTRA doesn't do any test compiles if it can get the information it 
needs from an xmkmf run.






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