$OpenBSD$
https://bugzilla.mozilla.org/show_bug.cgi?id=886095
--- mailnews/extensions/enigmail/genxpi.orig	Wed Jul  3 13:21:33 2013
+++ mailnews/extensions/enigmail/genxpi	Thu Jul 11 09:33:44 2013
@@ -78,6 +78,7 @@ fi
 subprocessDll=${libPrefix}subprocess${dllSuffix}
 spDllFile=platform/${platform}/lib/${libPrefix}subprocess-${xpcomAbi}${dllSuffix}
 
+cp ${targetDir}/chrome.manifest ${targetDir}/chrome.manifest.save
 # Prepare chrome.manifest
 cat  ${srcDir}/package/chrome.manifest | \
 sed  's/##ENIGMIMEDLL-PLACEHOLDER##/binary-component platform\/'${platform}'\/components\/'`basename ${enigDllFile}`' ABI='${platform}'/' \
@@ -151,4 +152,5 @@ zip ${xpiFile} \
     chrome.manifest \
     install.rdf
 
-rm install.rdf chrome.manifest
+rm install.rdf
+mv chrome.manifest.save chrome.manifest