--- /usr/portage/sci-libs/armadillo/armadillo-9.200.6.ebuild	2019-05-18 20:47:41.559035452 +0200
+++ armadillo-9.600.5.ebuild	2019-07-29 13:50:31.356899394 +0200
@@ -89,12 +76,15 @@
 	fi
 	if use hdf5; then
 		mycmakeargs+=(
+			-DDETECT_HDF5=ON
 			-DHDF5_FOUND=ON
 			-DHDF5_LIBRARIES="-lhdf5"
+			-DHDF5_INCLUDE_DIRS=/usr/include
 		)
 	else
 		mycmakeargs+=(
 			-DHDF5_FOUND=OFF
+			-DDETECT_HDF5=OFF
 		)
 	fi
 	if use lapack; then