Bash can perform brace expansion, but a POSIX sh (like dash) can not.
 –nico

diff -ur icedtea-3.16.0.orig/Makefile.am icedtea-3.16.0/Makefile.am
--- icedtea-3.16.0.orig/Makefile.am	2020-05-17 22:15:49.074638703 +0200
+++ icedtea-3.16.0/Makefile.am	2020-05-17 22:21:18.561557745 +0200
@@ -3096,8 +3096,13 @@
 	${mkinstalldirs} $(DESTDIR)${prefix}/jre/.systemPrefs
 	${mkinstalldirs} $(DESTDIR)${prefix}/jre/lib
 	${mkinstalldirs} $(DESTDIR)${prefix}/jre/lib/$(INSTALL_ARCH_DIR)
-	${mkinstalldirs} $(DESTDIR)${prefix}/jre/lib/{cmm,ext,images/cursors,management,security}
-	${mkinstalldirs} $(DESTDIR)$(mandir)/{man1,ja_JP.UTF-8/man1}
+	${mkinstalldirs} $(DESTDIR)${prefix}/jre/lib/cmm
+	${mkinstalldirs} $(DESTDIR)${prefix}/jre/lib/ext
+	${mkinstalldirs} $(DESTDIR)${prefix}/jre/lib/images/cursors
+	${mkinstalldirs} $(DESTDIR)${prefix}/jre/lib/management
+	${mkinstalldirs} $(DESTDIR)${prefix}/jre/lib/security
+	${mkinstalldirs} $(DESTDIR)$(mandir)/man1
+	${mkinstalldirs} $(DESTDIR)$(mandir)/ja_JP.UTF-8/man1
 	${mkinstalldirs} $(DESTDIR)${prefix}/demo
 	${mkinstalldirs} $(DESTDIR)${prefix}/sample
 	${mkinstalldirs} $(DESTDIR)$(docdir)
@@ -3357,7 +3362,11 @@
 	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/$(INSTALL_ARCH_DIR)/jli
 	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/$(INSTALL_ARCH_DIR)
 	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/security/policy
-	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/{cmm,ext,images/cursors,management,security}
+	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/cmm
+	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/ext
+	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/images/cursors
+	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/management
+	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/security
 	$(RMDIR) $(DESTDIR)${prefix}/jre/lib/images
 	$(RMDIR) $(DESTDIR)${prefix}/jre/bin $(DESTDIR)${prefix}/jre/lib
 	$(RMDIR) $(DESTDIR)${prefix}/jre/.systemPrefs
@@ -3370,7 +3379,8 @@
 	$(RMDIR) $(DESTDIR)$(TAPSET_DIR)/$(SYSTEMTAP_ARCH_DIR)
 	$(RMDIR) $(DESTDIR)$(TAPSET_DIR)
 	$(RMDIR) $(DESTDIR)$(sysconfdir)/.java/.systemPrefs
-	$(RMDIR) $(DESTDIR)$(mandir)/{man1,ja_JP.UTF-8/man1}
+	$(RMDIR) $(DESTDIR)$(mandir)/man1
+	$(RMDIR) $(DESTDIR)$(mandir)/ja_JP.UTF-8/man1
 	for sizes in 16 24 32 48 ; do \
 	  $(RMDIR) $(DESTDIR)$(datadir)/icons/hicolor/$${sizes}x$${sizes}/apps ; \
 	done