Update file README.md

README.md

@@ -27,7 +27,19 @@ their implementation possible.
 - bin2vhdl program is provided with its Makefile
 - Hepia-RISC .circ file is provided in hepiariscv2/
 - qemu-hr executable is provided in qemu-hr/
-- If you wish to rebuild qemu, the patch for qemu version 8.0.50 is in qemu-hr/qemu-hr.patch 
+- If you wish to rebuild qemu, the sources are provided in qemu-hr/
+
+### Compiling qemu-hr from source
+
+Enter the qemu-hr sources and build using the qemu build system :
+
+```
+cd qemu-hr
+mkdir build
+cd build
+../configure
+make
+```
 
 ## Usage