[Box Backup-dev] First errors on Darwin

[Ben Summers]

So, checkout, ./bootstrap and ./configure all work fine on Darwin.  
Initial errors are

g++ -DNDEBUG -O2 -Wall -I../../lib/win32 -I../../lib/common -I../../ 
lib/compress -I../../lib/crypto -I../../lib/server  - 
DBOX_VERSION="\"0.09_autoconf_win32\"" -I/sw/include  -c  
BackupDaemonConfigVerify.cpp -o ../../release/lib/backupclient/ 
BackupDaemonConfigVerify.o
BackupClientFileAttributes.cpp: In static member function 'static  
void BackupClientFileAttributes::FillExtendedAttr 
(StreamableMemBlock&, const char*)':
BackupClientFileAttributes.cpp:457: error: '::llistxattr' has not  
been declared
BackupClientFileAttributes.cpp:463: error: '::llistxattr' has not  
been declared
BackupClientFileAttributes.cpp:512: error: '::lgetxattr' has not been  
declared
BackupClientFileAttributes.cpp:520: error: '::lgetxattr' has not been  
declared
BackupClientFileAttributes.cpp: In member function 'void  
BackupClientFileAttributes::WriteExtendedAttr(const char*, int) const':
BackupClientFileAttributes.cpp:791: error: '::lsetxattr' has not been  
declared
g++ -DNDEBUG -O2 -Wall -I../../lib/win32 -I../../lib/common -I../../ 
lib/compress -I../../lib/crypto -I../../lib/server  - 
DBOX_VERSION="\"0.09_autoconf_win32\"" -I/sw/include  -c  
BackupStoreDirectory.cpp -o ../../release/lib/backupclient/ 
BackupStoreDirectory.o
*** Error code 1
BackupStoreDirectory.cpp:42: warning: non-local variable '<anonymous  
enum> dir_StreamFormatOptions' uses anonymous type


The last one is probably easy to sort out, but Darwin doesn't have  
llistxattr, but it does have listxattr:

ssize_t
      listxattr(const char *path, char *namebuf, size_t size, int  
options);

What sort autoconf magic do I need to detect this?

Ben