diff --git a/jars.mk b/jars.mk
index a11178342..c8513e664 100644
--- a/jars.mk
+++ b/jars.mk
@@ -16,7 +16,9 @@ define build-jar
 	$$(trace-javac) javac $(GLOBAL_JAVACFLAGS) $$($(1)_JAVACFLAGS) -d $$($(1)_TMPDIR) \
 	  $$(foreach fn, $$($(1)_SOURCES), '$$(fn)') \
 	  -cp "$$(subst $$(space),,$$(foreach jar,$$($(1)_JARS),$$($$(jar)_PATH):))$$$$CLASSPATH"
-	$$(trace-jar) jar cfm $$($(1)_PATH) <(echo -e '$$(subst $$(newline),\n,$$($(1)_MANIFEST))') -C $$($(1)_TMPDIR) .
+	@echo -e '$$(subst $$(newline),\n,$$($(1)_MANIFEST))' > $$($(1)_PATH).manifest
+	$$(trace-jar) jar cfm $$($(1)_PATH) $$($(1)_PATH).manifest -C $$($(1)_TMPDIR) .
+	@rm $$($(1)_PATH).manifest
 	@rm -rf $$($(1)_TMPDIR)
 
   $(1)_INSTALL_DIR ?= $$(jardir)
diff --git a/lib.mk b/lib.mk
index fd39d35bb..f390a7e8a 100644
--- a/lib.mk
+++ b/lib.mk
@@ -14,10 +14,6 @@ dist-files :=
 OS = $(shell uname -s)
 
 
-# Use bash (required for process substitution in the JAR function).
-SHELL = bash
-
-
 # Hack to define a literal space.
 space :=
 space +=