diff --git a/jars.mk b/jars.mk
index abe3f9fe5..a11178342 100644
--- a/jars.mk
+++ b/jars.mk
@@ -10,7 +10,7 @@ define build-jar
 
   _jars := $$(foreach jar, $$($(1)_JARS), $$($$(jar)_PATH))
 
-  $$($(1)_PATH): $$($(1)_SOURCES) $$(_jars)
+  $$($(1)_PATH): $$($(1)_SOURCES) $$(_jars) $$($(1)_EXTRA_DEPS)| $$($(1)_ORDER_AFTER)
 	@rm -rf $$($(1)_TMPDIR)
 	@mkdir -p $$($(1)_TMPDIR)
 	$$(trace-javac) javac $(GLOBAL_JAVACFLAGS) $$($(1)_JAVACFLAGS) -d $$($(1)_TMPDIR) \
@@ -19,7 +19,7 @@ define build-jar
 	$$(trace-jar) jar cfm $$($(1)_PATH) <(echo -e '$$(subst $$(newline),\n,$$($(1)_MANIFEST))') -C $$($(1)_TMPDIR) .
 	@rm -rf $$($(1)_TMPDIR)
 
-  $(1)_INSTALL_DIR ?= $$(libdir)/java
+  $(1)_INSTALL_DIR ?= $$(jardir)
 
   $(1)_INSTALL_PATH := $$($(1)_INSTALL_DIR)/$$($(1)_NAME).jar
 
diff --git a/lib.mk b/lib.mk
index 31308deaa..fd39d35bb 100644
--- a/lib.mk
+++ b/lib.mk
@@ -36,6 +36,7 @@ libdir ?= $(prefix)/lib
 bindir ?= $(prefix)/bin
 libexecdir ?= $(prefix)/libexec
 datadir ?= $(prefix)/share
+jardir ?= $(datadir)/java
 localstatedir ?= $(prefix)/var
 sysconfdir ?= $(prefix)/etc
 mandir ?= $(prefix)/share/man