Use full paths to java tools
TARGET ?= linux-amd64
-JAVA_HOME ?= /usr/local/jdk-13+33
+JAVA_HOME ?= /usr/local/jdk
-JAVAC ?= javac
-JAR ?= jar
-JMOD ?= jmod
+JAVAC ?= $(JAVA_HOME)/bin/javac
+JAR ?= $(JAVA_HOME)/bin/jar
+JMOD ?= $(JAVA_HOME)/bin/jmod
-JAVACFLAGS += -source 13
+JAVACFLAGS +=
# Linux options
linux-amd64_CPPFLAGS = \