des.h: present but cannot be compiled

[Steven Augart]

I just got the following message from running the configure script in
the GNU Emacs CVS head, which in turn says it was Generated by GNU
Autoconf 2.57:

configure: WARNING: des.h: present but cannot be compiled
configure: WARNING: des.h: check for missing prerequisite headers?
configure: WARNING: des.h: proceeding with the preprocessor's result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##

I'm reporting it to bug-autoconf because that's what configure told me
to do.

I've included the relevant sections from configure.log:

configure:15547: checking des.h usability
configure:15560: gcc -c -I/usr/X11R6/include -march=pentium3 -msse 
-I/usr/X11R6/include -D_BSD_SOURCE   conftest.c >&5
In file included from configure:15751:
/usr/local/include/des.h:205: error: conflicting types for `crypt'
/usr/include/unistd.h:946: error: previous declaration of `crypt'
configure:15563: $? = 1
configure: failed program was:
| #line 15549 "configure"
| /* confdefs.h.  */
| 
| #define PACKAGE_NAME ""
| #define PACKAGE_TARNAME ""
| #define PACKAGE_VERSION ""
| #define PACKAGE_STRING ""
| #define PACKAGE_BUGREPORT ""
| #define KERBEROS 1
| #define _GNU_SOURCE 1
| #define _FILE_OFFSET_BITS 64
| #define STDC_HEADERS 1
| #define HAVE_SYS_TYPES_H 1
| #define HAVE_SYS_STAT_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_STRING_H 1
| #define HAVE_MEMORY_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_INTTYPES_H 1
| #define HAVE_STDINT_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_SYS_SOUNDCARD_H 1
| #define HAVE_SYS_SELECT_H 1
| #define HAVE_SYS_TIMEB_H 1
| #define HAVE_SYS_TIME_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_UTIME_H 1
| #define HAVE_LINUX_VERSION_H 1
| #define HAVE_TERMIOS_H 1
| #define HAVE_LIMITS_H 1
| #define HAVE_STRING_H 1
| #define HAVE_STDLIB_H 1
| #define HAVE_TERMCAP_H 1
| #define HAVE_STDIO_EXT_H 1
| #define HAVE_FCNTL_H 1
| #define HAVE_STRINGS_H 1
| #define HAVE_PTY_H 1
| #define HAVE_SYS_MMAN_H 1
| #define HAVE_SYS_PARAM_H 1
| #define HAVE_SYS_VLIMIT_H 1
| #define HAVE_SYS_RESOURCE_H 1
| #define HAVE_LOCALE_H 1
| #define HAVE_TERM_H 1
| #define STDC_HEADERS 1
| #define TIME_WITH_SYS_TIME 1
| #define HAVE_DECL_SYS_SIGLIST 0
| #define HAVE_DECL___SYS_SIGLIST 0
| #define HAVE_SYS_WAIT_H 1
| #define HAVE_STRUCT_UTIMBUF 1
| #define RETSIGTYPE void
| #define HAVE_SPEED_T 1
| #define HAVE_TIMEVAL 1
| #define HAVE_STRUCT_TM_TM_ZONE 1
| #define HAVE_TM_ZONE 1
| #define HAVE_TM_GMTOFF 1
| #define PROTOTYPES 1
| #define __PROTOTYPES 1
| #define POINTER_TYPE void
| #define HAVE_LONG_FILE_NAMES 1
| #define DOUG_LEA_MALLOC 1
| #define HAVE_STDLIB_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_GETPAGESIZE 1
| #define HAVE_MMAP 1
| #define HAVE_XKBGETKEYBOARD 1
| #define HAVE_XRMSETDATABASE 1
| #define HAVE_XSCREENRESOURCESTRING 1
| #define HAVE_XSCREENNUMBEROFSCREEN 1
| #define HAVE_XSETWMPROTOCOLS 1
| #define HAVE_X11R6 1
| #define HAVE_X11R5 1
| #define HAVE_GTK 1
| #define USE_TOOLKIT_SCROLL_BARS 1
| #define HAVE_XIM 1
| #define USE_XIM 1
| #define XRegisterIMInstantiateCallback_arg6 XPointer
| #define HAVE_XPM 1
| #define HAVE_JPEG 1
| #define HAVE_JPEG 1
| #define HAVE_PNG_H 1
| #define HAVE_LIBPNG_PNG_H 1
| #define HAVE_PNG 1
| #define HAVE_TIFF 1
| #define HAVE_GIF 1
| #define HAVE_X_SM 1
| #define HAVE_H_ERRNO 1
| #define HAVE_ALLOCA_H 1
| #define HAVE_ALLOCA 1
| #define HAVE_LIBM 1
| #define HAVE_GETHOSTNAME 1
| #define HAVE_GETDOMAINNAME 1
| #define HAVE_DUP2 1
| #define HAVE_RENAME 1
| #define HAVE_CLOSEDIR 1
| #define HAVE_MKDIR 1
| #define HAVE_RMDIR 1
| #define HAVE_SYSINFO 1
| #define HAVE_RANDOM 1
| #define HAVE_LRAND48 1
| #define HAVE_BCOPY 1
| #define HAVE_BCMP 1
| #define HAVE_LOGB 1
| #define HAVE_FREXP 1
| #define HAVE_FMOD 1
| #define HAVE_RINT 1
| #define HAVE_CBRT 1
| #define HAVE_FTIME 1
| #define HAVE_SETSID 1
| #define HAVE_STRERROR 1
| #define HAVE_FPATHCONF 1
| #define HAVE_SELECT 1
| #define HAVE_MKTIME 1
| #define HAVE_EUIDACCESS 1
| #define HAVE_GETPAGESIZE 1
| #define HAVE_TZSET 1
| #define HAVE_SETLOCALE 1
| #define HAVE_UTIMES 1
| #define HAVE_SETRLIMIT 1
| #define HAVE_SETPGID 1
| #define HAVE_GETCWD 1
| #define HAVE_GETWD 1
| #define HAVE_SHUTDOWN 1
| #define HAVE_GETADDRINFO 1
| #define HAVE___FPENDING 1
| #define HAVE_MBLEN 1
| #define HAVE_MBRLEN 1
| #define HAVE_MBSINIT 1
| #define HAVE_STRSIGNAL 1
| #define HAVE_SETITIMER 1
| #define HAVE_UALARM 1
| #define HAVE_INDEX 1
| #define HAVE_RINDEX 1
| #define HAVE_SENDTO 1
| #define HAVE_RECVFROM 1
| #define HAVE_GETSOCKOPT 1
| #define HAVE_SETSOCKOPT 1
| #define HAVE_GETSOCKNAME 1
| #define HAVE_GETPEERNAME 1
| #define HAVE_GAI_STRERROR 1
| #define HAVE_MKSTEMP 1
| #define HAVE_GETLINE 1
| #define HAVE_GETDELIM 1
| #define HAVE_MREMAP 1
| #define HAVE_MEMMOVE 1
| #define HAVE_FSYNC 1
| #define HAVE_BZERO 1
| #define HAVE_MEMSET 1
| #define HAVE_MEMCMP 1
| #define HAVE_MEMMOVE 1
| #define HAVE_DIFFTIME 1
| #define HAVE_MEMCPY 1
| #define HAVE_MEMPCPY 1
| #define HAVE_MBLEN 1
| #define HAVE_MBRLEN 1
| #define HAVE_POSIX_MEMALIGN 1
| #define HAVE_SYS_UN_H 1
| #define HAVE_SYS_TIME_H 1
| #define HAVE_UNISTD_H 1
| #define HAVE_ALARM 1
| #define HAVE_GETLOADAVG 1
| #define HAVE_FSEEKO 1
| #define GETPGRP_VOID 1
| #define HAVE_STRFTIME 1
| #define HAVE_GRANTPT 1
| #define HAVE_GETPT 1
| #define HAVE_LIBNCURSES 1
| #define HAVE_LIBCOM_ERR 1
| #define HAVE_LIBDES 1
| /* end confdefs.h.  */
| #include <stdio.h>
| #if HAVE_SYS_TYPES_H
| # include <sys/types.h>
| #endif
| #if HAVE_SYS_STAT_H
| # include <sys/stat.h>
| #endif
| #if STDC_HEADERS
| # include <stdlib.h>
| # include <stddef.h>
| #else
| # if HAVE_STDLIB_H
| #  include <stdlib.h>
| # endif
| #endif
| #if HAVE_STRING_H
| # if !STDC_HEADERS && HAVE_MEMORY_H
| #  include <memory.h>
| # endif
| # include <string.h>
| #endif
| #if HAVE_STRINGS_H
| # include <strings.h>
| #endif
| #if HAVE_INTTYPES_H
| # include <inttypes.h>
| #else
| # if HAVE_STDINT_H
| #  include <stdint.h>
| # endif
| #endif
| #if HAVE_UNISTD_H
| # include <unistd.h>
| #endif
| #include <des.h>
configure:15579: result: no
configure:15583: checking des.h presence
configure:15594: gcc -E -I/usr/X11R6/include -D_BSD_SOURCE   conftest.c
configure:15600: $? = 0
configure:15619: result: yes
configure:15639: WARNING: des.h: present but cannot be compiled
configure:15641: WARNING: des.h: check for missing prerequisite headers?
configure:15643: WARNING: des.h: proceeding with the preprocessor's result


Please let me know what I can do to assist you in tracking down the
bug, if it is indeed a bug.   


--Steve Augart