diff --git a/sci-chemistry/avogadro2/avogadro2-1.100.0.ebuild b/sci-chemistry/avogadro2/avogadro2-1.100.0-r1.ebuild
similarity index 98%
rename from sci-chemistry/avogadro2/avogadro2-1.100.0.ebuild
rename to sci-chemistry/avogadro2/avogadro2-1.100.0-r1.ebuild
index 841b082db04d0..ce8df32481bbe 100644
--- a/sci-chemistry/avogadro2/avogadro2-1.100.0.ebuild
+++ b/sci-chemistry/avogadro2/avogadro2-1.100.0-r1.ebuild
@@ -26,6 +26,7 @@ RDEPEND="
 "
 DEPEND="${RDEPEND}
 	dev-cpp/eigen:3
+	vtk? ( dev-libs/pegtl )
 "
 BDEPEND="doc? ( app-text/doxygen )"