Add info about single module recompilation ##doc

DEVELOPERS.md

@@ -564,6 +564,18 @@ export CC="ccache gcc"
 This will automatically detect when files do not need to recompiled and avoid
 unnecessary work.
 
+It is not necessary to recompile the whole project everytime. Just run make in
+the directory you are working on to compile these parts only by using:
+
+```sh
+make
+```
+
+while inside a modified module (eg: `libr/core`).
+
+Note that if you have radare2 already installed, you don't have to reinstall it
+again after recompilation, as the compiled libraries are connected through the symlinks.
+
 ## Repeated installation
 
 There is an alternative installation method for radare2 to make it easier to

libr/include/r_anal.h

@@ -385,6 +385,7 @@ typedef struct r_anal_options_t {
 	bool propagate_noreturn;
 	bool recursive_noreturn; // anal.rnr
 	bool slow;
+	// R2_600 - add zign_dups field for "zign.dups" config
 } RAnalOptions;
 
 // XXX we have cc / calling conventions / abi settings already no need for a custom enum here