fix build with JDK11

libidn-jar.patch

@@ -0,0 +1,29 @@
+commit d19cfa1589ae4718b9f6d67a175d6e2868e4b8b8
+Author: Simon Josefsson <simon@josefsson.org>
+Date:   Tue Apr 28 16:58:37 2020 +0200
+
+    Fix libidn.jar building with non-gcj.
+
+diff --git a/java/Makefile.am b/java/Makefile.am
+index 1bb706fa..3d72989c 100644
+--- a/java/Makefile.am
++++ b/java/Makefile.am
+@@ -46,16 +46,14 @@ libidn-$(VERSION).jar:
+ 			gnu/inet/encoding/Punycode.class		\
+ 		-C $(builddir)/src/main/java \
+ 			gnu/inet/encoding/PunycodeException.class	\
+-		-C $(builddir)/src/main/java \
+-			gnu/inet/encoding/RangeSet\$$1.class		\
+ 		-C $(builddir)/src/main/java \
+ 			gnu/inet/encoding/RangeSet\$$Builder.class	\
+-		-C $(builddir)/src/main/java \
+-			gnu/inet/encoding/RangeSet.class		\
+ 		-C $(builddir)/src/main/java \
+ 			gnu/inet/encoding/RangeSet\$$Range.class	\
+ 		-C $(builddir)/src/main/java \
+ 			gnu/inet/encoding/RangeSet\$$RangeContainsComparator.class \
++		-C $(builddir)/src/main/java \
++			gnu/inet/encoding/RangeSet.class		\
+ 		-C $(builddir)/src/main/java \
+ 			gnu/inet/encoding/RFC3454.class			\
+ 		-C $(builddir)/src/main/java \

libidn.spec

@@ -12,6 +12,8 @@ License: LGPLv2+ and GPLv3+ and GFDL
 Source0: http://ftp.gnu.org/gnu/libidn/libidn-%{version}.tar.gz
 # Allow disabling Emacs support
 Patch0: libidn-1.33-Allow-disabling-Emacs-support.patch
+# Fix build with JDK11
+Patch1: libidn-jar.patch
 
 BuildRequires: autoconf autoconf-archive
 BuildRequires: automake
@@ -76,6 +78,7 @@ This package contains javadoc for %{name}-java.
 %prep
 %setup -q
 %patch0 -p1
+%patch1 -p1
 autoreconf -vif
 # Prevent from regenerating sources by gengetopt because it's broken.
 touch src/idn_cmd.c src/idn_cmd.h