install.markdown

 in the etc directory are necessary external libraries 
-to use (especially ALVAR) there is necessary to set environment variables 
-the exports.sh does is
-just run 
 
-```bash
-. exports.sh
-```
 ALVAR library 
 --------------------
 the workflow described in ALVAR is for me is not working for me 
@@ -16,9 +10,17 @@ mkdir mybuild
 cd mybuild
 cmake ..
 make
+cd ..
 ```
 the libraries are then in mybuild/src
 
+to use ALVAR, it is necessary to set environment variables 
+the exports.sh does is
+just run 
+
+```bash
+. exports.sh
+```
 
 VFLIB
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