diff --git a/xsom.spec b/xsom.spec
index 2f7db06..5a796fd 100644
--- a/xsom.spec
+++ b/xsom.spec
@@ -1,7 +1,7 @@
 Name:           xsom
 Summary:        XML Schema Object Model (XSOM)
 Version:        20140514
-Release:        1%{?dist}
+Release:        2%{?dist}
 License:        CDDL-1.1 or GPLv2 with exceptions
 
 # java.net is dead; upstream sources have been imported to GitHub though
@@ -15,8 +15,10 @@ Source1: http://docs.oasis-open.org/regrep/v3.0/schema/lcm.xsd
 # patch POM to drop tasks that rely on bundled JARs
 Patch0:         00-pom-changes.patch
 
+BuildRequires:  relaxngcc
 BuildRequires:  maven-local
 BuildRequires:  mvn(junit:junit)
+BuildRequires:  mvn(org.apache.maven.plugins:maven-antrun-plugin)
 BuildRequires:  mvn(org.codehaus.mojo:build-helper-maven-plugin)
 BuildRequires:  mvn(relaxngDatatype:relaxngDatatype)
 
@@ -52,8 +54,12 @@ sed -i \
   's|http://docs.oasis-open.org/regrep/v3.0/schema/lcm.xsd|file://%{SOURCE1}|' \
   test/XSOMParserTest.java
 
+pushd lib
+ln -sf `build-classpath relaxngcc` relaxngcc.jar
+popd
+
 %build
-%mvn_build -- -Dproject.build.sourceEncoding=UTF-8
+%mvn_build -- -Dproject.build.sourceEncoding=UTF-8 -P regenerate-sources
 
 %install
 %mvn_install
@@ -65,6 +71,9 @@ sed -i \
 %license license.txt copyright.txt
 
 %changelog
+* Wed Nov 06 2019 Fabio Valentini <decathorpe@gmail.com> - 20140514-2
+- Regenerate sources during build.
+
 * Thu Oct 24 2019 Fabio Valentini <decathorpe@gmail.com> - 20140514-1
 - Update to version 20140514.