diff -Nru orig/PROJ/src/Makevars.win patched/PROJ/src/Makevars.win
--- orig/PROJ/src/Makevars.win	2020-03-26 15:21:01.000000000 +0100
+++ patched/PROJ/src/Makevars.win	2020-07-02 18:06:41.598029100 +0200
@@ -1,23 +1,13 @@
-VERSION = 6.1.0
-RWINLIB = ../windows/proj-$(VERSION)
-PKG_CPPFLAGS = -I$(RWINLIB)/include -DHAVE_PROJ6_API=1
+PKG_CPPFLAGS = -DHAVE_PROJ6_API=1
 TARGET = lib$(R_ARCH)
 
-PKG_LIBS = \
-	-L$(RWINLIB)/$(TARGET) \
-	-L$(RWINLIB)/lib$(R_ARCH) \
-	-lproj -lsqlite3
+PKG_LIBS = -lproj -lsqlite3 -lcurl -ltiff -ljpeg -lrtmp -lssl -lssh2 -lgcrypt -lcrypto -lgdi32 -lz -lzstd -lwebp -llzma -lgdi32 -lcrypt32 -lidn2 -lunistring -liconv -lgpg-error -lws2_32 -lwldap32 -lwinmm
 
 CXX_STD = CXX11
 
-all: clean winlibs
-
-winlibs:
-	mkdir -p ../inst
-	"${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" --vanilla "../tools/winlibs.R" $(VERSION)
-	cp -r $(RWINLIB)/share/proj ../inst/
+all: clean 
 
 clean:
 	rm -f $(SHLIB) $(OBJECTS)
 
-.PHONY: all winlibs clean
+.PHONY: all clean