further dependencies

README.md

@@ -61,7 +61,11 @@ If they have not been installed, on linux platform, do the following:
 sudo apt-get install autoconf
 sudo apt-get install automake
 ```
-Then run the script `build.sh`, which will generate the executable file `src/src/scallop`.
+
+Scallop might also requires other libraries, such as `libbz`, depending on
+your system. Install them if you encounter errors when compiling.
+
+After that run the script `build.sh`, which will generate the executable file `src/src/scallop`.
 
 
 # Usage