fix freebsd build

based on bugmen0t input

configure.ac

@@ -15,6 +15,7 @@ m4_include([m4/cxx11.m4])
 AX_CXX_COMPILE_STDCXX_11([noext])
 AC_CHECK_LIB([mtp], [LIBMTP_Init], [], [AC_MSG_ERROR([libmtp not found])])
 AC_CHECK_HEADERS([libmtp.h])
+AC_CHECK_FUNCS([fdatasync])
 PKG_CHECK_MODULES([FUSE], [fuse >= 2.8])
 
 AC_SUBST([FUSE_CFLAGS])

src/simple-mtpfs-fuse.cpp

@@ -584,7 +584,12 @@ int SMTPFileSystem::flush(const char *path, struct fuse_file_info *file_info)
 int SMTPFileSystem::fsync(const char *path, int datasync,
     struct fuse_file_info *fi)
 {
-    return datasync ? ::fdatasync(fi->fh) : ::fsync(fi->fh);
+#ifdef HAVE_FDATASYNC
+    if (datasync)
+        return ::fdatasync(fi->fh);
+    else
+#endif
+    return ::fsync(fi->fh);
 }
 
 int SMTPFileSystem::opendir(const char *path, struct fuse_file_info *file_info)

src/simple-mtpfs-fuse.h

@@ -20,6 +20,7 @@
 
 #include <memory>
 #include <string>
+#include <cstdlib>
 extern "C" {
 #  include <fuse/fuse.h>
 }

src/simple-mtpfs-mtp-device.cpp

@@ -24,6 +24,7 @@
 extern "C" {
 #  include <unistd.h>
 #  include <sys/types.h>
+#  define _DARWIN_USE_64_BIT_INODE
 #  include <sys/stat.h>
 }
 #include "simple-mtpfs-fuse.h"
@@ -449,8 +450,8 @@ int MTPDevice::filePush(const std::string &src, const std::string &dst)
         }
     }
 
-    struct stat64 file_stat;
-    stat64(src.c_str(), &file_stat);
+    struct stat file_stat;
+    stat(src.c_str(), &file_stat);
     TypeFile file_to_upload(0, dir_parent->id(), dir_parent->storageid(),
         dst_basename, static_cast<uint64_t>(file_stat.st_size), 0);
     LIBMTP_file_t *f = file_to_upload.toLIBMTPFile();

src/simple-mtpfs-type-dir.cpp

@@ -17,6 +17,7 @@
 
 #include <config.h>
 #include <algorithm>
+#include <cstdlib>
 #include <cstring>
 extern "C" {
 #  include <libmtp.h>