--- configure.ac.orig	2020-04-02 12:05:25.019234433 +0200
+++ configure.ac	2020-04-02 12:06:27.138863342 +0200
@@ -42,7 +42,7 @@ DAV_CHECK_NEON
 # Checks for header files.
 AC_HEADER_DIRENT
 AC_HEADER_STDC
-AC_CHECK_HEADERS([fcntl.h iconv.h libintl.h langinfo.h limits.h locale.h mntent.h stddef.h stdint.h stdlib.h string.h sys/file.h sys/mount.h sys/time.h syslog.h termios.h unistd.h utime.h])
+AC_CHECK_HEADERS([error.h fcntl.h iconv.h libintl.h langinfo.h limits.h locale.h mntent.h stddef.h stdint.h stdlib.h string.h sys/file.h sys/mount.h sys/time.h sys/select.h sys/types.h syslog.h termios.h unistd.h utime.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
@@ -78,7 +78,7 @@ AC_FUNC_SELECT_ARGTYPES
 AC_FUNC_STRFTIME
 AC_FUNC_STAT
 AC_FUNC_UTIME_NULL
-AC_CHECK_FUNCS([endpwent ftruncate getmntent iconv memset mkdir nl_langinfo rpmatch select setlocale strcasecmp strchr strdup strerror strpbrk strrchr strstr strtol strtoull utime])
+AC_CHECK_FUNCS([endpwent ftruncate getmntent memset mkdir nl_langinfo rpmatch select setlocale strcasecmp strchr strdup strerror strpbrk strrchr strstr strtol strtoull utime canonicalize_file_name fopencookie])
 
 # Misc.
 DAV_DEFAULTS
--- src/cache.c
+++ src/cache.c
@@ -19,12 +19,12 @@
 
 
 #include "config.h"
+#include "compat.h"
 
 #ifdef HAVE_DIRENT_H
 #include <dirent.h>
 #endif
 #include <errno.h>
-#include <error.h>
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>
 #endif
--- src/dav_fuse.c
+++ src/dav_fuse.c
@@ -47,6 +47,9 @@
 #ifdef HAVE_SYS_STAT_H
 #include <sys/stat.h>
 #endif
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
 
 #include "defaults.h"
 #include "mount_davfs.h"
--- src/kernel_interface.c
+++ src/kernel_interface.c
@@ -19,8 +19,8 @@
 
 
 #include "config.h"
+#include "compat.h"
 
-#include <error.h>
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>
 #endif
@@ -51,6 +51,9 @@
 #ifdef HAVE_SYS_STAT_H
 #include <sys/stat.h>
 #endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
 #include <sys/wait.h>
 
 #include "defaults.h"
--- src/mount_davfs.c
+++ src/mount_davfs.c
@@ -19,10 +19,10 @@
 
 
 #include "config.h"
+#include "compat.h"
 
 #include <ctype.h>
 #include <errno.h>
-#include <error.h>
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>
 #endif
--- src/umount_davfs.c
+++ src/umount_davfs.c
@@ -19,8 +19,8 @@
 
 
 #include "config.h"
+#include "compat.h"
 
-#include <error.h>
 #include <errno.h>
 #include <getopt.h>
 #ifdef HAVE_LIBINTL_H
--- src/webdav.c
+++ src/webdav.c
@@ -19,9 +19,9 @@
 
 
 #include "config.h"
+#include "compat.h"
 
 #include <errno.h>
-#include <error.h>
 #ifdef HAVE_FCNTL_H
 #include <fcntl.h>
 #endif
@@ -368,6 +368,7 @@ dav_init_webdav(const dav_args *args)
         error(EXIT_FAILURE, errno, _("socket library initialization failed"));
 
     if (args->neon_debug & ~NE_DBG_HTTPPLAIN) {
+#ifdef HAVE_FOPENCOOKIE
         char *buf = malloc(log_bufsize);
         cookie_io_functions_t *log_func = malloc(sizeof(cookie_io_functions_t));
         if (!log_func) abort();
@@ -380,6 +381,9 @@ dav_init_webdav(const dav_args *args)
             error(EXIT_FAILURE, errno,
                   _("can't open stream to log neon-messages"));
         ne_debug_init(log_stream, args->neon_debug);
+#else
+	error(EXIT_FAILURE, 0, "neon debugging unsupported");
+#endif
     }
 
     session = ne_session_create(args->scheme, args->host, args->port);
--- /dev/null
+++ src/compat.h
@@ -0,0 +1,64 @@
+#ifndef _COMPAT_H
+#define _COMPAT_H
+
+#ifndef _PATH_MOUNTED
+# define _PATH_MOUNTED "/proc/mounts"
+#endif
+
+#ifndef _PATH_MNTTAB
+# define _PATH_MNTTAB "/etc/fstab"
+#endif
+
+#ifdef HAVE_ERROR_H
+# include <error.h>
+#else
+# include <stdio.h>
+# include <stdarg.h>
+# include <stdlib.h>
+# include <string.h>
+static void error_at_line(int status, int errnum, const char *filename,
+                          unsigned int linenum, const char *format, ...)
+{
+	va_list ap;
+
+	fflush(stdout);
+
+	if (filename != NULL)
+		fprintf(stderr, "%s:%u: ", filename, linenum);
+
+	va_start(ap, format);
+	vfprintf(stderr, format, ap);
+	va_end(ap);
+
+	if (errnum != 0)
+		fprintf(stderr, ": %s", strerror(errnum));
+
+	fprintf(stderr, "\n");
+
+	if (status != 0)
+		exit(status);
+}
+
+#define error(status, errnum, format...) \
+	error_at_line(status, errnum, NULL, 0, format)
+
+#endif /* HAVE_ERROR_H */
+
+#ifndef HAVE_CANONICALIZE_FILE_NAME
+#include <limits.h>
+#include <string.h>
+#include <stdlib.h>
+static char * canonicalize_file_name(const char *path)
+{
+	char buf[PATH_MAX] = { };
+
+	snprintf(buf, sizeof(buf) - 1, "%s", path);
+
+	if (!realpath(path, buf))
+		return NULL;
+
+	return strdup(buf);
+}
+#endif
+
+#endif /* _COMPAT_H */
