(autoconf.info.gz) System Services

(autoconf.info.gz) Compilers and Preprocessors
 
 System Services
 ===============
 
    The following macros check for operating system services or
 capabilities.
 
  - Macro: AC_PATH_X
      Try to locate the X Window System include files and libraries.  If
      the user gave the command line options `--x-includes=DIR' and
      `--x-libraries=DIR', use those directories.  If either or both
      were not given, get the missing values by running `xmkmf' on a
      trivial `Imakefile' and examining the `Makefile' that it produces.
      If that fails (such as if `xmkmf' is not present), look for the
      files in several directories where they often reside.  If either
      method is successful, set the shell variables `x_includes' and
      `x_libraries' to their locations, unless they are in directories
      the compiler searches by default.
 
      If both methods fail, or the user gave the command line option
      `--without-x', set the shell variable `no_x' to `yes'; otherwise
      set it to the empty string.
 
  - Macro: AC_PATH_XTRA
      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 also checks for special libraries that some systems
      need in order to compile X programs.  It adds any that the system
      needs to output variable `X_EXTRA_LIBS'.  And it checks for
      special X11R6 libraries that need to be linked with before
      `-lX11', and adds any found to the output variable `X_PRE_LIBS'.
 
 
  - Macro: AC_SYS_INTERPRETER
      Check whether the system supports starting scripts with a line of
      the form `#! /bin/csh' to select the interpreter to use for the
      script.  After running this macro, shell code in `configure.ac'
      can check the shell variable `interpval'; it will be set to `yes'
      if the system supports `#!', `no' if not.
 
  - Macro: AC_SYS_LARGEFILE
      Arrange for large-file support(1).  On some hosts, one must use
      special compiler options to build programs that can access large
      files.  Append any such options to the output variable `CC'.
      Define `_FILE_OFFSET_BITS' and `_LARGE_FILES' if necessary.
 
      Large-file support can be disabled by configuring with the
      `--disable-largefile' option.
 
      If you use this macro, check that your program works even when
      `off_t' is longer than `long', since this is common when
      large-file support is enabled.  For example, it is not correct to
      print an arbitrary `off_t' value `X' with `printf ("%ld", (long)
      X)'.
 
  - Macro: AC_SYS_LONG_FILE_NAMES
      If the system supports file names longer than 14 characters, define
      `HAVE_LONG_FILE_NAMES'.
 
  - Macro: AC_SYS_POSIX_TERMIOS
      Check to see if the POSIX termios headers and functions are
      available on the system.  If so, set the shell variable
      `ac_cv_sys_posix_termios' to `yes'.  If not, set the variable to
      `no'.
 
    ---------- Footnotes ----------
 
    (1) large-file support,
 <http://www.sas.com/standards/large.file/x_open.20Mar96.html>.
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