Re: present but cannot be compiled (Was: None)

[Akim Demaille]

Thanks for the bug report!

Contrary to the message reported by ./configure, this is not a bug in
Autoconf, but the result of a recent incompatible change in Autoconf
that is likely to require the package's configure.ac to be updated.
Please, first make sure you are trying the most recent version of that
package, then, if you are, send all this message (including your
output attached) to the bug list (or the authors) of the package you
were trying to configure.

Below two parts of the Autoconf documentation are included: 1. the
documentation of AC_CHECK_HEADER(S), and 2. what's to be done to
upgrade configure.ac.

If you have some knowledge in C compilation, then there is something
more you can do to help: find out what are the prerequisite headers on
your system.

For instance, if the error message is:

       sys/socket.h: present but cannot be compiled
       sys/socket.h: check for missing prerequisite headers?
       sys/socket.h: proceeding with the preprocessor's result

then try to compile the program sample.c:

       #include <sys/socket.h>

with `cc -c sample.c'.  It will fail.  Then try to understand what
other headers are needed.  For instance, on Darwin, one needs:

       #include <stdio.h>
       #include <stdlib.h>
       #include <sys/socket.h>
       #include <sys/socket.h>

to get a successful compilation.  Then, send this additional
information to the package maintainers, together with a description of
your machine.

Thanks!

----------------------------------------------------------------------

Generic Header Checks
---------------------

   These macros are used to find system header files not covered by the
"particular" test macros.  If you need to check the contents of a header
as well as find out whether it is present, you have to write your own
test for it (*note Writing Tests::).

 - Macro: AC_CHECK_HEADER (HEADER-FILE, [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND], [INCLUDES = `default-includes'])
     If the system header file HEADER-FILE is compilable, execute shell
     commands ACTION-IF-FOUND, otherwise execute ACTION-IF-NOT-FOUND.
     If you just want to define a symbol if the header file is
     available, consider using `AC_CHECK_HEADERS' instead.

     For compatibility issues with older versions of Autoconf, please
     read below.

 - Macro: AC_CHECK_HEADERS (HEADER-FILE..., [ACTION-IF-FOUND],
          [ACTION-IF-NOT-FOUND], [INCLUDES = `default-includes'])
     For each given system header file HEADER-FILE in the
     whitespace-separated argument list that exists, define
     `HAVE_HEADER-FILE' (in all capitals).  If ACTION-IF-FOUND is
     given, it is additional shell code to execute when one of the
     header files is found.  You can give it a value of `break' to
     break out of the loop on the first match.  If ACTION-IF-NOT-FOUND
     is given, it is executed when one of the header files is not found.

     For compatibility issues with older versions of Autoconf, please
     read below.

   Previous versions of Autoconf merely checked whether the header was
accepted by the preprocessor.  This was changed because the old test was
inappropriate for typical uses.  Headers are typically used to compile,
not merely to preprocess, and the old behavior sometimes accepted
headers that clashed at compile-time.  If you need to check whether a
header is preprocessable, you can use `AC_PREPROC_IFELSE' (*note
Running the Preprocessor::).

   This scheme, which improves the robustness of the test, also requires
that you make sure that headers that must be included before the
HEADER-FILE be part of the INCLUDES, (*note Default Includes::).  If
looking for `bar.h', which requires that `foo.h' be included before if
it exists, we suggest the following scheme:


AC_CHECK_HEADERS([foo.h])
AC_CHECK_HEADERS([bar.h], [], [],
[#if HAVE_FOO_H
# include <foo.h>
# endif
])

----------------------------------------------------------------------

Header Present But Cannot Be Compiled
=====================================

   The most important guideline to bear in mind when checking for
features is to mimic as much as possible the intended use.
Unfortunately, old versions of `AC_CHECK_HEADER' and `AC_CHECK_HEADERS'
failed to follow this idea, and called the preprocessor, instead of the
compiler, to check for headers.  As a result, incompatibilities between
headers went unnoticed during configuration, and maintainers finally
had to deal with this issue elsewhere.

   As of Autoconf 2.56 both checks are performed, and `configure'
complains loudly if the compiler and the preprocessor do not agree.
For the time being the result used is that of the preprocessor, to give
maintainers time to adjust their `configure.ac', but in the near
future, only the compiler will be considered.

   Consider the following example:

     $ cat number.h
     typedef int number;
     $ cat pi.h
     const number pi = 3;
     $ cat configure.ac
     AC_INIT
     AC_CHECK_HEADERS(pi.h)
     $ autoconf -Wall
     $ ./configure
     checking for gcc... gcc
     checking for C compiler default output... a.out
     checking whether the C compiler works... yes
     checking whether we are cross compiling... no
     checking for suffix of executables...
     checking for suffix of object files... o
     checking whether we are using the GNU C compiler... yes
     checking whether gcc accepts -g... yes
     checking for gcc option to accept ANSI C... none needed
     checking how to run the C preprocessor... gcc -E
     checking for egrep... grep -E
     checking for ANSI C header files... yes
     checking for sys/types.h... yes
     checking for sys/stat.h... yes
     checking for stdlib.h... yes
     checking for string.h... yes
     checking for memory.h... yes
     checking for strings.h... yes
     checking for inttypes.h... yes
     checking for stdint.h... yes
     checking for unistd.h... yes
     checking pi.h usability... no
     checking pi.h presence... yes
     configure: WARNING: pi.h: present but cannot be compiled
     configure: WARNING: pi.h: check for missing prerequisite headers?
     configure: WARNING: pi.h: proceeding with the preprocessor's result
     configure: WARNING:     ## ------------------------------------ ##
     configure: WARNING:     ## Report this to address@hidden ##
     configure: WARNING:     ## ------------------------------------ ##
     checking for pi.h... yes

The proper way the handle this case is using the fourth argument (*note
Generic Headers::):

     $ cat configure.ac
     AC_INIT
     AC_CHECK_HEADERS(number.h pi.h,,,
     [[#if HAVE_NUMBER_H
     # include <number.h>
     #endif
     ]])
     $ autoconf -Wall
     $ ./configure
     checking for gcc... gcc
     checking for C compiler default output... a.out
     checking whether the C compiler works... yes
     checking whether we are cross compiling... no
     checking for suffix of executables...
     checking for suffix of object files... o
     checking whether we are using the GNU C compiler... yes
     checking whether gcc accepts -g... yes
     checking for gcc option to accept ANSI C... none needed
     checking for number.h... yes
     checking for pi.h... yes

   See *Note Particular Headers::, for a list of headers with their
prerequisite.

----------------------------------------------------------------------

Portability of Headers
----------------------

This section tries to collect knowledge about common headers, and the
problems they cause.  By definition, this list will always require
additions.  Please help us keeping it as complete as possible.

`inttypes.h' vs. `stdint.h'
     Paul Eggert notes that: ISO C 1999 says that `inttypes.h' includes
     `stdint.h', so there's no need to include `stdint.h' separately in
     a standard environment.  Many implementations have `inttypes.h'
     but not `stdint.h' (e.g., Solaris 7), but I don't know of any
     implementation that has `stdint.h' but not `inttypes.h'.  Nor do I
     know of any free software that includes `stdint.h'; `stdint.h'
     seems to be a creation of the committee.

`linux/irda.h'
     It requires `linux/types.h' and `sys/socket.h'.

`net/if.h'
     On Darwin, this file requires that `sys/socket.h' be included
     beforehand.  One should run:

          AC_CHECK_HEADERS([sys/socket.h])
          AC_CHECK_HEADERS([net/if.h], [], [],
          [#include <stdio.h>
          #if STDC_HEADERS
          # include <stdlib.h>
          # include <stddef.h>
          #else
          # if HAVE_STDLIB_H
          #  include <stdlib.h>
          # endif
          #endif
          #if HAVE_SYS_SOCKET_H
          # include <sys/socket.h>
          #endif
          ])

`stdint.h'
     See above, item `inttypes.h' vs. `stdint.h'.

`stdlib.h'
     On many systems (e.g., Darwin), `stdio.h' is a prerequisite.

`sys/socket.h'
     On Darwin, `stdlib.h' is a prerequisite.

`X11/extensions/scrnsaver.h'
     Using XFree86, this header requires `X11/Xlib.h', which is probably
     so required that you might not even consider looking for it.

          AC_CHECK_HEADERS([X11/extensions/scrnsaver.h], [], [],
          [[#include <X11/Xlib.h>
          ]])

----------------------------------------------------------------------
Greetings.
I was trying to install Emacs from CVS on a MacOS X 10.2.6 (Darwin 6.6)
system using gcc 3.3, and the configure script threw up several warnings
and suggestions to send them to you, so I did a ./configure >& file and
here goes:

checking build system type... powerpc-apple-darwin6.6
checking host system type... powerpc-apple-darwin6.6
checking for gcc... gcc
checking for C compiler default output... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables...
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether gcc accepts -g... yes
checking for gcc option to accept ANSI C... none needed
checking whether ln -s works... yes
checking how to run the C preprocessor... cc -E -traditional-cpp
checking for a BSD-compatible install... /sw/bin/install -c
checking for ranlib... ranlib
checking for install-info... /sw/sbin/install-info
checking for install-info... (cached) /sw/sbin/install-info
checking for install-info... (cached) /sw/sbin/install-info
checking for egrep... grep -E
checking for AIX... no
configure: checking the machine- and system-dependent files to find out
 - which libraries the lib-src programs will want, and
 - whether the GNU malloc routines are usable...
checking for special C compiler options needed for large files... no
checking for _FILE_OFFSET_BITS value needed for large files... no
checking for _LARGE_FILES value needed for large files... no
checking for ANSI C header files... no
checking for sys/types.h... no
checking for sys/stat.h... no
checking for stdlib.h... no
checking for string.h... no
checking for memory.h... no
checking for strings.h... no
checking for inttypes.h... no
checking for stdint.h... no
checking for unistd.h... no
checking machine/soundcard.h usability... no
checking machine/soundcard.h presence... no
checking for machine/soundcard.h... no
checking sys/soundcard.h usability... no
checking sys/soundcard.h presence... no
checking for sys/soundcard.h... no
checking soundcard.h usability... no
checking soundcard.h presence... no
checking for soundcard.h... no
checking for _oss_ioctl in -lossaudio... no
checking sys/select.h usability... no
checking sys/select.h presence... yes
configure: WARNING: sys/select.h: present but cannot be compiled
configure: WARNING: sys/select.h: check for missing prerequisite headers?
configure: WARNING: sys/select.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/select.h... yes
checking sys/timeb.h usability... no
checking sys/timeb.h presence... yes
configure: WARNING: sys/timeb.h: present but cannot be compiled
configure: WARNING: sys/timeb.h: check for missing prerequisite headers?
configure: WARNING: sys/timeb.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/timeb.h... yes
checking sys/time.h usability... no
checking sys/time.h presence... yes
configure: WARNING: sys/time.h: present but cannot be compiled
configure: WARNING: sys/time.h: check for missing prerequisite headers?
configure: WARNING: sys/time.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/time.h... yes
checking for unistd.h... (cached) no
checking utime.h usability... no
checking utime.h presence... yes
configure: WARNING: utime.h: present but cannot be compiled
configure: WARNING: utime.h: check for missing prerequisite headers?
configure: WARNING: utime.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for utime.h... yes
checking linux/version.h usability... no
checking linux/version.h presence... no
checking for linux/version.h... no
checking sys/systeminfo.h usability... no
checking sys/systeminfo.h presence... no
checking for sys/systeminfo.h... no
checking termios.h usability... no
checking termios.h presence... yes
configure: WARNING: termios.h: present but cannot be compiled
configure: WARNING: termios.h: check for missing prerequisite headers?
configure: WARNING: termios.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for termios.h... yes
checking limits.h usability... no
checking limits.h presence... yes
configure: WARNING: limits.h: present but cannot be compiled
configure: WARNING: limits.h: check for missing prerequisite headers?
configure: WARNING: limits.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for limits.h... yes
checking for string.h... (cached) no
checking for stdlib.h... (cached) no
checking termcap.h usability... no
checking termcap.h presence... yes
configure: WARNING: termcap.h: present but cannot be compiled
configure: WARNING: termcap.h: check for missing prerequisite headers?
configure: WARNING: termcap.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for termcap.h... yes
checking stdio_ext.h usability... no
checking stdio_ext.h presence... no
checking for stdio_ext.h... no
checking fcntl.h usability... no
checking fcntl.h presence... yes
configure: WARNING: fcntl.h: present but cannot be compiled
configure: WARNING: fcntl.h: check for missing prerequisite headers?
configure: WARNING: fcntl.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for fcntl.h... yes
checking term.h usability... no
checking term.h presence... yes
configure: WARNING: term.h: present but cannot be compiled
configure: WARNING: term.h: check for missing prerequisite headers?
configure: WARNING: term.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for term.h... yes
checking for strings.h... (cached) no
checking coff.h usability... no
checking coff.h presence... no
checking for coff.h... no
checking pty.h usability... no
checking pty.h presence... no
checking for pty.h... no
checking sys/mman.h usability... no
checking sys/mman.h presence... yes
configure: WARNING: sys/mman.h: present but cannot be compiled
configure: WARNING: sys/mman.h: check for missing prerequisite headers?
configure: WARNING: sys/mman.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/mman.h... yes
checking sys/param.h usability... no
checking sys/param.h presence... yes
configure: WARNING: sys/param.h: present but cannot be compiled
configure: WARNING: sys/param.h: check for missing prerequisite headers?
configure: WARNING: sys/param.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/param.h... yes
checking sys/vlimit.h usability... no
checking sys/vlimit.h presence... yes
configure: WARNING: sys/vlimit.h: present but cannot be compiled
configure: WARNING: sys/vlimit.h: check for missing prerequisite headers?
configure: WARNING: sys/vlimit.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/vlimit.h... yes
checking sys/resource.h usability... no
checking sys/resource.h presence... yes
configure: WARNING: sys/resource.h: present but cannot be compiled
configure: WARNING: sys/resource.h: check for missing prerequisite headers?
configure: WARNING: sys/resource.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/resource.h... yes
checking for term.h... (cached) yes
checking for ANSI C header files... (cached) no
checking whether time.h and sys/time.h may both be included... no
checking whether sys_siglist is declared... no
checking whether __sys_siglist is declared... no
checking for sys/wait.h that is POSIX.1 compatible... no
checking for struct utimbuf... no
checking return type of signal handlers... int
checking for speed_t... no
checking for struct timeval... no
checking for struct exception... no
checking whether struct tm is in sys/time.h or time.h... sys/time.h
checking for struct tm.tm_zone... no
checking for tzname... no
checking for struct tm.tm_gmtoff... no
checking for function prototypes... yes
checking for working volatile... no
checking for an ANSI C-conforming const... no
checking for void * support... no
checking whether make sets $(MAKE)... yes
checking for long file names... yes
checking for X... libraries /usr/X11R6/lib, headers /usr/X11R6/include
checking for malloc_get_state... no
checking for malloc_set_state... no
checking whether __after_morecore_hook exists... no
checking for stdlib.h... (cached) no
checking for unistd.h... (cached) no
checking for getpagesize... no
checking for working mmap... no
checking for dnet_ntoa in -ldnet... no
checking for main in -lXbsd... no
checking for cma_open in -lpthreads... no
checking for XFree86 in /usr/X386... no
checking for Xkb... no
checking for XrmSetDatabase... no
checking for XScreenResourceString... no
checking for XScreenNumberOfScreen... no
checking for XSetWMProtocols... no
checking X11 version 6... before 6
checking X11 version 5... before 5
checking X11/xpm.h usability... no
checking X11/xpm.h presence... yes
configure: WARNING: X11/xpm.h: present but cannot be compiled
configure: WARNING: X11/xpm.h: check for missing prerequisite headers?
configure: WARNING: X11/xpm.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for X11/xpm.h... yes
checking for XpmReadFileToPixmap in -lXpm... no
checking jerror.h usability... no
checking jerror.h presence... no
checking for jerror.h... no
checking png.h usability... no
checking png.h presence... no
checking for png.h... no
checking tiffio.h usability... no
checking tiffio.h presence... no
checking for tiffio.h... no
checking gif_lib.h usability... no
checking gif_lib.h presence... no
checking for gif_lib.h... no
checking Carbon/Carbon.h usability... no
checking Carbon/Carbon.h presence... yes
configure: WARNING: Carbon/Carbon.h: present but cannot be compiled
configure: WARNING: Carbon/Carbon.h: check for missing prerequisite headers?
configure: WARNING: Carbon/Carbon.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for Carbon/Carbon.h... yes
checking X11/SM/SMlib.h usability... no
checking X11/SM/SMlib.h presence... yes
configure: WARNING: X11/SM/SMlib.h: present but cannot be compiled
configure: WARNING: X11/SM/SMlib.h: check for missing prerequisite headers?
configure: WARNING: X11/SM/SMlib.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for X11/SM/SMlib.h... yes
checking for SmcOpenConnection in -lSM... no
./configure: -lICE: command not found
checking whether netdb declares h_errno... no
checking for working alloca.h... no
checking for alloca... no
checking whether `alloca.c' needs Cray hooks... no
checking stack direction for C alloca... -1
checking for sqrt in -lm... no
checking for maillock in -lmail... no
checking for maillock in -llockfile... no
checking for liblockfile.so... no
checking for touchlock... no
checking maillock.h usability... no
checking maillock.h presence... no
checking for maillock.h... no
checking for gethostname... no
checking for getdomainname... no
checking for dup2... no
checking for rename... no
checking for closedir... no
checking for mkdir... no
checking for rmdir... no
checking for sysinfo... no
checking for random... no
checking for lrand48... no
checking for bcopy... no
checking for bcmp... no
checking for logb... no
checking for frexp... no
checking for fmod... no
checking for rint... no
checking for cbrt... no
checking for ftime... no
checking for res_init... no
checking for setsid... no
checking for strerror... no
checking for fpathconf... no
checking for select... no
checking for mktime... no
checking for euidaccess... no
checking for getpagesize... (cached) no
checking for tzset... no
checking for setlocale... no
checking for utimes... no
checking for setrlimit... no
checking for setpgid... no
checking for getcwd... no
checking for getwd... no
checking for shutdown... no
checking for strftime... no
checking for getaddrinfo... no
checking for __fpending... no
checking for mblen... no
checking for mbrlen... no
checking for mbsinit... no
checking for strsignal... no
checking for setitimer... no
checking for ualarm... no
checking for index... no
checking for rindex... no
checking for sendto... no
checking for recvfrom... no
checking for getsockopt... no
checking for setsockopt... no
checking for getsockname... no
checking for getpeername... no
checking for gai_strerror... no
checking for mkstemp... no
checking for getline... no
checking for getdelim... no
checking for mremap... no
checking for memmove... no
checking for fsync... no
checking for bzero... no
checking for memset... no
checking for memcmp... no
checking for memmove... (cached) no
checking sys/un.h usability... no
checking sys/un.h presence... yes
configure: WARNING: sys/un.h: present but cannot be compiled
configure: WARNING: sys/un.h: check for missing prerequisite headers?
configure: WARNING: sys/un.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for sys/un.h... yes
checking for sys/time.h... (cached) yes
checking for unistd.h... (cached) no
checking for alarm... no
checking for working mktime... no
checking for getloadavg... no
checking for pstat_getdynamic... no
checking for kstat_open in -lkstat... no
checking for elf_begin in -lelf... no
checking for kvm_open in -lkvm... no
checking for getloadavg in -lutil... no
checking for getloadavg in -lgetloadavg... no
checking for getloadavg... no
checking sys/dg_sys_info.h usability... no
checking sys/dg_sys_info.h presence... no
checking for sys/dg_sys_info.h... no
checking locale.h usability... no
checking locale.h presence... yes
configure: WARNING: locale.h: present but cannot be compiled
configure: WARNING: locale.h: check for missing prerequisite headers?
configure: WARNING: locale.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for locale.h... yes
checking for setlocale... (cached) no
checking inq_stats/cpustats.h usability... no
checking inq_stats/cpustats.h presence... no
checking for inq_stats/cpustats.h... no
checking sys/cpustats.h usability... no
checking sys/cpustats.h presence... no
checking for sys/cpustats.h... no
checking mach/mach.h usability... no
checking mach/mach.h presence... yes
configure: WARNING: mach/mach.h: present but cannot be compiled
configure: WARNING: mach/mach.h: check for missing prerequisite headers?
configure: WARNING: mach/mach.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for mach/mach.h... yes
checking nlist.h usability... no
checking nlist.h presence... yes
configure: WARNING: nlist.h: present but cannot be compiled
configure: WARNING: nlist.h: check for missing prerequisite headers?
configure: WARNING: nlist.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##
checking for nlist.h... yes
checking for struct nlist.n_un.n_name... no
checking whether getloadavg requires setgid... no
checking for _LARGEFILE_SOURCE value needed for large files... no
checking for fseeko... no
checking whether getpgrp requires zero arguments... yes
checking for grantpt... no
checking for getpt... no
checking for tparm in -lncurses... no
checking for dgettext in -lintl... no
checking whether localtime caches TZ... no
checking for socket... no
checking whether system supports dynamic ptys... no
checking for pid_t... no
checking for unistd.h... (cached) no
checking vfork.h usability... no
checking vfork.h presence... no
checking for vfork.h... no
checking for fork... no
checking for vfork... no
checking for nl_langinfo and CODESET... no
checking for size_t... no
checking for C restrict keyword... no
checking for C restricted array declarations... no
checking for nlist.h... (cached) yes

Configured for `powerpc-apple-darwin6.6'.

  Where should the build process find the source code?    
/Users/shrao/bin/emacs/emacs
  What operating system and machine description files should Emacs use?
        `s/darwin.h' and `m/powermac.h'
  What compiler should emacs be built with?               gcc -g -O2
  Should Emacs use the GNU version of malloc?             no
    (The GNU allocators don't work with this system configuration.)
  Should Emacs use a relocating allocator for buffers?    no
  Should Emacs use mmap(2) for buffer allocation?         no
  What window system should Emacs use?                    mac
  What toolkit should Emacs use?                          none
  Where do we find X Windows header files?                /usr/X11R6/include
  Where do we find X Windows libraries?                   /usr/X11R6/lib
  Does Emacs use -lXaw3d?                                 no
  Does Emacs use -lXpm?                                   no
  Does Emacs use -ljpeg?                                  no
  Does Emacs use -ltiff?                                  no
  Does Emacs use -lungif?                                 no
  Does Emacs use -lpng?                                   no
  Does Emacs use X toolkit scroll bars?                   no

configure: creating ./config.status
config.status: creating Makefile
config.status: creating lib-src/Makefile.c
config.status: creating oldXMenu/Makefile
config.status: creating man/Makefile
config.status: creating lwlib/Makefile
config.status: creating src/Makefile.c
config.status: creating lisp/Makefile
config.status: creating lispref/Makefile
config.status: creating lispintro/Makefile
config.status: creating leim/Makefile
config.status: creating src/config.h
config.status: executing default commands
creating src/epaths.h
creating lib-src/Makefile
In file included from ../src/config.h:846,
                 from junk.c:6:
../src/s/darwin.h:290:1: warning: "NO_MATHERR" redefined
In file included from junk.c:6:
../src/config.h:664:1: warning: this is the location of the previous definition
creating src/Makefile
In file included from config.h:846,
                 from junk.c:11:
s/darwin.h:290:1: warning: "NO_MATHERR" redefined
In file included from junk.c:11:
config.h:664:1: warning: this is the location of the previous definition

==

Hope this helps.  Have a nice day.

Regards,

Shrisha Rao