diff -Nru orig/SuperGauss/src/Makevars.ucrt patched/SuperGauss/src/Makevars.ucrt
--- orig/SuperGauss/src/Makevars.ucrt	1970-01-01 01:00:00.000000000 +0100
+++ patched/SuperGauss/src/Makevars.ucrt	2021-02-17 19:45:26.987866000 +0100
@@ -0,0 +1,2 @@
+PKG_CXXFLAGS=-I"../inst/include"
+PKG_LIBS=-lfftw3