diff -Nru orig/XBRL/src/Makevars.ucrt patched/XBRL/src/Makevars.ucrt
--- orig/XBRL/src/Makevars.ucrt	1970-01-01 01:00:00.000000000 +0100
+++ patched/XBRL/src/Makevars.ucrt	2021-02-17 19:45:27.097240200 +0100
@@ -0,0 +1,5 @@
+## Use the R_HOME indirection to support installations of multiple R version
+
+PKG_CXXFLAGS=-I${R_TOOLS_SOFT}/include/libxml2 -DLIBXML_STATIC
+
+PKG_LIBS = $(shell "${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" -e "Rcpp:::LdFlags()") -lxml2 -llzma -liconv -lz -lws2_32