vtk: link against libatomic where needed

srcpkgs/vtk/template

@@ -26,6 +26,17 @@ if [ "$XBPS_TARGET_LIBC" = "musl" ]; then
 	LDFLAGS="-lexecinfo"
 fi
 
+if [ "$XBPS_TARGET_NO_ATOMIC8" ]; then
+	makedepends+=" libatomic-devel"
+fi
+
+post_extract() {
+	[ "$XBPS_TARGET_NO_ATOMIC8" ] || return 0
+
+	echo "vtk_module_link(VTK::CommonDataModel PRIVATE atomic)" >> \
+		Common/DataModel/CMakeLists.txt
+}
+
 post_install() {
 	vlicense Copyright.txt