explicitly specify maven compiler source and target versions

plexus-build-api.spec

@@ -1,6 +1,6 @@
 Name:           plexus-build-api
 Version:        0.0.7
-Release:        24%{?dist}
+Release:        25%{?dist}
 Summary:        Plexus Build API
 License:        ASL 2.0
 URL:            https://github.com/sonatype/sisu-build-api
@@ -40,8 +40,10 @@ cp -p %{SOURCE1} .
 
 %mvn_file : plexus/%{name}
 
+%pom_xpath_remove "pom:build/pom:plugins/pom:plugin[pom:artifactId='maven-compiler-plugin']/pom:configuration"
+
 %build
-%mvn_build
+%mvn_build -- -Dmaven.compiler.source=1.6 -Dmaven.compiler.target=1.6
 
 %install
 %mvn_install
@@ -53,6 +55,9 @@ cp -p %{SOURCE1} .
 %doc LICENSE-2.0.txt
 
 %changelog
+* Wed Nov 13 2019 Fabio Valentini <decathorpe@gmail.com> - 0.0.7-25
+- Explicitly specify maven compiler source and target versions.
+
 * Thu Oct 17 2019 Fabio Valentini <decathorpe@gmail.com> - 0.0.7-24
 - Port to plexus-utils 3.3.0.