Index: firmware/App/Common.h
===================================================================
diff -u -rd9cc76524777a12ba77b58ce95416dddfb032997 -r620104f4a9e3148575703981a3063b9605b6e9b8
--- firmware/App/Common.h	(.../Common.h)	(revision d9cc76524777a12ba77b58ce95416dddfb032997)
+++ firmware/App/Common.h	(.../Common.h)	(revision 620104f4a9e3148575703981a3063b9605b6e9b8)
@@ -138,6 +138,7 @@
         #pragma WEAK(can1HighLevelInterrupt)
             void can1HighLevelInterrupt(void) {}
     #endif
+    #define fabs(v)     ((v) < 0.0 ? ((v) * -1.0) : (v))
 
 #endif