diff --git a/src/ppr_1d.F90 b/src/ppr_1d.F90
new file mode 100644
index 0000000..4eed6a5
--- /dev/null
+++ b/src/ppr_1d.F90
@@ -0,0 +1,3 @@
+!-- an alternative to building with the -cpp compile flag 
+
+#   include "ppr_1d.f90"