diff --git a/haven/src/Makevars.in b/haven/src/Makevars.in
index 27c35b6..f805d61 100644
--- a/haven/src/Makevars.in
+++ b/haven/src/Makevars.in
@@ -4,8 +4,5 @@ CPPFILES = $(wildcard *.cpp)
 SOURCES = $(CFILES) $(CPPFILES)
 
 # This must be defined identically in Makevars.win
-OBJECTS = $(CFILES:.c=.o) $(CPPFILES:.cpp=.o)
 
-PKG_CFLAGS = @cflags@ -Ireadstat -DHAVE_ZLIB
-PKG_CXXFLAGS = @cflags@ -Ireadstat -DHAVE_ZLIB
-PKG_LIBS = @libs@
+PKG_LIBS = -lreadstat