Makefiles can set custom simavr path

Author: metala

Makefile.common

@@ -27,7 +27,14 @@
 #	along with simavr.  If not, see <http://www.gnu.org/licenses/>.
 
 # simavr directory
+ifndef SIMAVR
 SIMAVR		:= ${shell for p in . .. ../.. ../../..;do test -d $$p/simavr/sim && echo $$p/simavr; done}
+endif
+
+# check if it is found
+ifeq ("$(wildcard $(SIMAVR)/sim/)","")
+$(warning Simavr path not found. SIMAVR=$(SIMAVR))
+endif
 
 # You can override the build settings with local changes in this file
 # for example: