--- /usr/portage/app-admin/keepass/keepass-2.30.ebuild	2015-08-19 13:01:02.000000000 +0200
+++ /usr/local/portage/app-admin/keepass/keepass-2.30.ebuild	2015-09-28 17:16:15.584006030 +0200
@@ -33,6 +33,8 @@
 	# KeePass looks for some XSL files in the same folder as the executable,
 	# we prefer to have it in /usr/share/KeePass
 	epatch "${FILESDIR}/${PN}-2.20-xsl-path-detection.patch"
+
+	has_version ">=dev-lang/mono-4" && epatch "${FILESDIR}/${PN}-2.30-mono-4-support.patch"
 }
 
 src_compile() {