diff --git a/Examples/Makefile.in b/Examples/Makefile.in
index 8a88fb5ea..e29a7608a 100644
--- a/Examples/Makefile.in
+++ b/Examples/Makefile.in
@@ -1693,7 +1693,7 @@ r: $(SRCDIR_SRCS)
 ifneq ($(SRCDIR_SRCS),)
 	$(CC) -g -c $(CPPFLAGS) $(CFLAGS) $(R_CFLAGS) $(SRCDIR_SRCS) $(INCLUDES)
 endif
-	+( PKG_CPPFLAGS="$(CPPFLAGS) $(INCLUDES)" $(COMPILETOOL) $(R) CMD SHLIB -o $(LIBPREFIX)$(TARGET)$(SO) $(ISRCS) $(OBJS) > /dev/null )
+	+( PKG_CPPFLAGS="$(CPPFLAGS) $(INCLUDES)" PKG_CFLAGS="$(CFLAGS)" $(COMPILETOOL) $(R) CMD SHLIB -o $(LIBPREFIX)$(TARGET)$(SO) $(ISRCS) $(OBJS) > /dev/null )
 
 # ----------------------------------------------------------------
 # Build a R dynamically loadable module (C++)
@@ -1703,7 +1703,7 @@ r_cpp: $(SRCDIR_CXXSRCS)
 ifneq ($(SRCDIR_CXXSRCS),)
 	$(CXX) -g -c $(CPPFLAGS) $(CXXFLAGS) $(R_CFLAGS) $(SRCDIR_CXXSRCS) $(INCLUDES)
 endif
-	+( PKG_CPPFLAGS="$(CPPFLAGS) $(INCLUDES)" $(COMPILETOOL) $(R) CMD SHLIB -o $(LIBPREFIX)$(TARGET)$(SO) $(RCXXSRCS) $(OBJS) > /dev/null )
+	+( PKG_CPPFLAGS="$(CPPFLAGS) $(INCLUDES)" PKG_CXXFLAGS="$(CXXFLAGS)" $(COMPILETOOL) $(R) CMD SHLIB -o $(LIBPREFIX)$(TARGET)$(SO) $(RCXXSRCS) $(OBJS) > /dev/null )
 
 # -----------------------------------------------------------------
 # Run R example