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+		       GlusterFS Porting Guide
+                       -----------------------
+
+* General setup
+
+The configure script will detect the target platform for the build. 
+All platform-specific CFLAGS, macro definitions should be done
+in configure.ac
+
+Platform-specific code can be written like this:
+
+#ifdef GF_DARWIN_HOST_OS
+  /* some code specific to Darwin */
+#endif
+
+* Coding guidelines
+
+In general, avoid glibc extensions. For example, nested functions don't work 
+on Mac OS X. It is best to stick to C99.
+
+When using library calls and system calls, pay attention to the
+portability notes. As far as possible stick to POSIX-specified behavior. 
+Do not use anything expressly permitted by the specification. For example,
+some fields in structures may be present only on certain platforms. Avoid
+use of such things.
+
+Do not pass values of constants such as F_*, O_*, errno values, etc. across
+platforms.
+
+Please refer compat-errno.h for more details about errno handling inside 
+glusterfs for cross platform. 
+
+* Specific issues
+
+- The argp library is available only on Linux through glibc, but for other
+  platforms glusterfs has already included argp-standalone library which will
+  statically linked during the glusterfs build. 
+
+- Extended attribute calls (setxattr, listxattr, etc.) have differing prototypes
+  on different platforms. See compat.h for macro definitions to resolve this, also
+  read out the specific extended attribute documentation for your platforms.
+
+------------------------------------------
+Last revised: Thu Feb 28 13:58:07 IST 2008
+------------------------------------------