diff --git a/platforms/IIgs/build.sh b/platforms/IIgs/build.sh
index f92bcb8..929ad47 100755
--- a/platforms/IIgs/build.sh
+++ b/platforms/IIgs/build.sh
@@ -6,5 +6,8 @@ ca65 -I ../../inc IIgs.s -l IIgs.lst
 ../../build.sh IIgs
 ld65 -C IIgs.l -S 0x8000 IIgs.o ../../forth.o -m forth.map -o forth
 ls -l forth
-java -jar ${ACMD} -pro140 forth.po FORTH
-java -jar ${ACMD} -p forth.po FORTH SYS < forth
+if [ -r "${ACMD}" ]; then
+  java -jar ${ACMD} -pro140 forth.po FORTH
+  java -jar ${ACMD} -p forth.po FORTH SYS < forth
+fi
+