diff --git a/netcomponents-java14compat.patch b/netcomponents-java14compat.patch
index f59ddc7..86a4c65 100644
--- a/netcomponents-java14compat.patch
+++ b/netcomponents-java14compat.patch
@@ -1,39 +1,3 @@
-Nur in NetComponents-1.3.8: build.
-diff -ru NetComponents-1.3.8.orig/build.xml NetComponents-1.3.8/build.xml
---- NetComponents-1.3.8.orig/build.xml	2001-11-30 04:20:12.000000000 +0100
-+++ NetComponents-1.3.8/build.xml	2007-07-23 21:13:39.462024000 +0200
-@@ -33,7 +33,9 @@
-          excludes="examples/**"
-          debug="${build.debug}"
-          deprecation="${build.deprecation}"
--         optimize="${build.optimize}"/>
-+         optimize="${build.optimize}"
-+	 source="1.4"
-+	 target="1.4" />
-   </target>
- 
-   <!-- examples target.  Compiles the example classes. -->
-@@ -44,7 +46,9 @@
-          destdir="${build.dir}/examples"
-          debug="${build.debug}"
-          deprecation="${build.deprecation}"
--         optimize="${build.optimize}"/>
-+         optimize="${build.optimize}"
-+	 source="1.4"
-+	 target="1.4"/>
-   </target>
- 
-   <!-- jar target.  Compiles the source directory and creates a .jar file -->
-@@ -68,7 +72,8 @@
-             windowtitle="${name} ${version} API"
-             doctitle="${name} ${version} API"
-             header="&lt;map name=&apos;_logoMap&apos;&gt;&lt;area href=&apos;http://www.savarese.org/&apos; alt=&apos;Savarese.Org Home&apos; shape=rect coords=&apos;0,0,66,14&apos;&gt;&lt;area href=&apos;http://www.savarese.org/oro/&apos; alt=&apos;ORO Home&apos;shape=rect coords=&apos;0,15,66,70&apos;&gt;&lt;/map&gt;&lt;img src=&apos;{@docroot}/../images/soroLogo.gif&apos; alt=&apos;Savarese.Org/ORO Logo&apos; width=67 height=71 align=left border=0 hspace=1 vspace=0 usemap=&apos;#_logoMap&apos;&gt;"
--            bottom="${copyright.message}">
-+            bottom="${copyright.message}"
-+	    source="1.4">
- <!--
-            overview="${build.src.dir}/com/oroinc/overview.html"
- -->
 diff -ru NetComponents-1.3.8.orig/src/java/com/oroinc/net/ftp/FTP.java NetComponents-1.3.8/src/java/com/oroinc/net/ftp/FTP.java
 --- NetComponents-1.3.8.orig/src/java/com/oroinc/net/ftp/FTP.java	2001-11-30 04:20:12.000000000 +0100
 +++ NetComponents-1.3.8/src/java/com/oroinc/net/ftp/FTP.java	2007-07-23 21:10:49.091561000 +0200
diff --git a/netcomponents.changes b/netcomponents.changes
index de8e044..3bdcd7c 100644
--- a/netcomponents.changes
+++ b/netcomponents.changes
@@ -1,3 +1,12 @@
+-------------------------------------------------------------------
+Tue Sep 19 15:38:03 UTC 2017 - fstrba@suse.com
+
+- Specify java source and target level 1.6: fix jdk9 build
+- Modified patch:
+  * netcomponents-java14compat.patch
+    + Don't hardcode java source and target levels, specify them
+      on command-line.
+
 -------------------------------------------------------------------
 Sat May 20 18:19:26 UTC 2017 - tchvatal@suse.com
 
diff --git a/netcomponents.spec b/netcomponents.spec
index 7ecf6f1..5dbbbba 100644
--- a/netcomponents.spec
+++ b/netcomponents.spec
@@ -26,8 +26,8 @@ Url:            http://www.savarese.org/java/
 Source:         http://www.savarese.org/downloads/NetComponents/NetComponents-1.3.8-src.tar.gz
 Patch0:         %{name}-java14compat.patch
 BuildRequires:  ant
+BuildRequires:  fdupes
 BuildRequires:  xml-commons-apis
-BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 BuildArch:      noarch
 
 %description
@@ -69,7 +69,9 @@ This package contains the javadoc documentation for netcomponents.
 %patch0 -p1
 
 %build
-ant jar javadocs
+ant \
+    -Dant.build.javac.source=1.6 -Dant.build.javac.target=1.6 \
+    jar javadocs
 
 %install
 # jar
@@ -79,14 +81,13 @@ cp -p build/lib/NetComponents-%{version}.jar %{buildroot}%{_javadir}/%{name}-%{v
 # javadoc
 mkdir -p %{buildroot}%{_javadocdir}/%{name}
 cp -pr build/docs/api/* %{buildroot}%{_javadocdir}/%{name}
+%fdupes -s %{buildroot}%{_javadocdir}/%{name}
 
 %files
-%defattr(0644,root,root,0755)
 %doc CHANGES README COPYRIGHT LICENSE
 %{_javadir}/*
 
 %files javadoc
-%defattr(0644,root,root,0755)
 %{_javadocdir}/%{name}
 
 %changelog