Gentoo's dev-java/bnd is unbundled. We're adding the parts here:
--- a/build.xml
+++ b/build.xml
@@ -225,7 +225,16 @@
 
   <!-- Classpaths -->
   <path id="compile.classpath">
+    <pathelement location="${ant.jar}"/>
     <pathelement location="${bnd.jar}"/>
+    <pathelement location="${bnd-annotation.jar}"/>
+    <pathelement location="${bnd-ant.jar}"/>
+    <pathelement location="${bnd-util.jar}"/>
+    <pathelement location="${bndlib.jar}"/>
+    <pathelement location="${libg.jar}"/>
+    <pathelement location="${osgi-cmpn.jar}"/>
+    <pathelement location="${osgi-core.jar}"/>
+    <pathelement location="${slf4j-api.jar}"/>
     <pathelement location="${jdt.jar}"/>
     <pathelement location="${jaxrpc-lib.jar}"/>
     <pathelement location="${wsdl4j-lib.jar}"/>
@@ -3924,6 +3933,14 @@ Read the Building page on the Apache Tomcat documentation site for details on ho
     <!-- Add bnd tasks to project -->
     <path id="bnd.classpath">
       <fileset file="${bnd.jar}" />
+      <fileset file="${bnd-annotation.jar}" />
+      <fileset file="${bnd-ant.jar}" />
+      <fileset file="${bnd-util.jar}" />
+      <fileset file="${bndlib.jar}" />
+      <fileset file="${libg.jar}" />
+      <fileset file="${osgi-cmpn.jar}" />
+      <fileset file="${osgi-core.jar}" />
+      <fileset file="${slf4j-api.jar}" />
     </path>
 
     <taskdef resource="aQute/bnd/ant/taskdef.properties" classpathref="bnd.classpath" />