OSX build
With the patch below I got jmtpfs to build under Lion using libmtp, fuse4x, gcc46 (or gcc47), and file (libmagic) installed via macports. I'll include the patch in my next release.
There is still one weird issue though. If jmtpfs is run without the foreground (-f) option, you just get i/o errors when trying to access the device. It looks like something in the way fuse4x is backgrounding the process is messing up libmtp. But with -f it seems to work fine.
Index: src/jmtpfs.cpp
===================================================================
--- src/jmtpfs.cpp (revision 5445)
+++ src/jmtpfs.cpp (working copy)
@@ -22,11 +22,10 @@
#include "ConnectedMtpDevices.h"
#include "mtpFilesystemErrors.h"
#include "Mutex.h"
+#include "FuseHeader.h"
#include <MtpRoot.h>
#include <iostream>
-#include <fuse.h>
-#include <fuse_opt.h>
#include <cstddef>
#include <errno.h>
#include <sstream>
Index: src/MtpNode.h
===================================================================
--- src/MtpNode.h (revision 5445)
+++ src/MtpNode.h (working copy)
@@ -25,7 +25,7 @@
#include "MtpMetadataCache.h"
#include "MtpFilesystemPath.h"
#include "MtpDevice.h"
-#include <fuse.h>
+#include "FuseHeader.h"
#include <time.h>
#include <vector>
#include <string>
Index: src/FuseHeader.h
===================================================================
--- src/FuseHeader.h (revision 0)
+++ src/FuseHeader.h (revision 5447)
@@ -0,0 +1,30 @@
+/*
+ * FuseHeader.h
+ *
+ * Author: Jason Ferrara
+ *
+ * This software is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 3 as published by the Free Software Foundation.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02111-1301, USA.
+ *
licensing@fsf.org
+ */
+
+#ifndef FUSEHEADER_H_
+#define FUSEHEADER_H_
+
+#define FUSE_USE_VERSION 26
+#include <fuse.h>
+#include <fuse_opt.h>
+
+
+#endif /* FUSEHEADER_H_ */
Index: src/MtpLocalFileCopy.cpp
===================================================================
--- src/MtpLocalFileCopy.cpp (revision 5445)
+++ src/MtpLocalFileCopy.cpp (working copy)
@@ -22,6 +22,7 @@
#include "mtpFilesystemErrors.h"
#include <sys/stat.h>
#include <iostream>
+#include <unistd.h>
MtpLocalFileCopy::MtpLocalFileCopy(MtpDevice& device, uint32_t id) :
m_device(device), m_remoteId(id), m_needWriteBack(false)