Index: README.md
==================================================================
--- README.md
+++ README.md
@@ -10,10 +10,13 @@
 ## How to build it?
 
 You need [ObjFW](https://objfw.nil.im) and
 [ObjOpenSSL](https://fossil.nil.im/objopenssl) installed in order to do this.
 
+ObjMatrix uses modern Objective-C, and hence cannot be compiled with GCC, but
+only with Clang. So install Clang first and ObjFW will automatically pick it up.
+
 You can install them all like this:
 
     $ for i in objfw objopenssl objmatrix; do
           fossil clone https://fossil.nil.im/$i $i.fossil &&
           mkdir $i &&
@@ -24,16 +27,16 @@
           make &&
           sudo make install &&
           cd .. || break
       done
 
-You might need to install your distribution's -dev packages for OpenSSL and
-SQLite3 beforehand. E.g. on Ubuntu:
+You might need to install your distribution's `-dev` packages for OpenSSL
+beforehand. E.g. on Ubuntu:
 
-    $ sudo apt install libssl-dev libsqlite3-dev
+    $ sudo apt install libssl-dev
 
 ## Contributing
 
-Just create an account on the [ObjMatrix
-Fossil](https://fossil.nil.im/objmatrix) and post your patch on the
+Just create an account on the
+[ObjMatrix Fossil](https://fossil.nil.im/objmatrix) and post your patch on the
 [forum](https://fossil.nil.im/objmatrix/forum). After a few patches, you will
 be granted commit access.