diff --git a/README.md b/README.md
index c1dd610..dc2e554 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,10 @@ irmc - Internet Relay Morse Code
 ================================
 IRMC stands for Internet Relay Morse Code and is an implementation of [MOIP](http://8ch9azbsfifz.github.io/moip/).
 
+# Building 
+## On Linux
+Install portaudio, i.e.:  sudo apt-get install libportaudio-dev
+
 # Hardware interface options
 A good description on how to build different interfaces (telegraph key, sounder or both) 
 is given on the [MorseKOB Website](http://kob.sdf.org/morsekob/interface.htm). 
diff --git a/src/irmc.c b/src/irmc.c
index 4f47daa..d4febaa 100644
--- a/src/irmc.c
+++ b/src/irmc.c
@@ -19,14 +19,18 @@
 #include <sys/time.h>
 #include <stdio.h>
 
+// Detect OSX
 #ifdef __MACH__
     #include <mach/clock.h>
     #include <mach/mach.h>
-#else
+#endif 
+
+// Detect Raspi
+#ifdef __ARM
     #include <linux/ioctl.h>
     #include <asm-generic/ioctl.h>
     #include <asm-generic/termios.h>
-#endif 
+#endif
 
 //#define DEBUG 1