diff -ru ntopng-2.4-stable.orig/configure.ac ntopng-2.4-stable/configure.ac
--- ntopng-2.4-stable.orig/configure.ac	2016-11-20 03:59:19.928851928 -0800
+++ ntopng-2.4-stable/configure.ac	2016-11-20 03:59:53.717850915 -0800
@@ -341,14 +341,6 @@
 	GMAKE="make"
 fi
 
-GPP=`which clang++`
-if test x$GPP = x
-then
-	GPP="g++"
-else
-	GPP="$GPP -O0"
-fi
-
 GIT=`which git`
 if test x$GIT = x
 then
diff -ru ntopng-2.4-stable.orig/Makefile.in ntopng-2.4-stable/Makefile.in
--- ntopng-2.4-stable.orig/Makefile.in	2016-06-27 12:31:18.000000000 -0700
+++ ntopng-2.4-stable/Makefile.in	2016-11-20 04:00:31.037849796 -0800
@@ -4,7 +4,6 @@
 SHELL=/bin/sh
 OS := $(shell uname -s)
 PWD=@PWD@
-GPP=@GPP@
 INSTALL_DIR=$(DESTDIR)$(prefix)
 MAN_DIR=$(DESTDIR)@MAN_DIR@
 
@@ -126,12 +125,12 @@
 	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@
 
 %.o: %.cpp $(HEADERS) Makefile
-	$(GPP) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c $< -o $@
 
 .PRECIOUS: $(TARGET) $(OBJECTS)
 
 $(TARGET): $(OBJECTS) $(LIBRRDTOOL) Makefile
-	$(GPP) $(OBJECTS) -Wall $(LIBS) -o $@
+	$(CXX) $(OBJECTS) $(CXXFLAGS) $(CPPFLAGS) -Wall $(LIBS) -o $@
 
 $(LUAJIT_LIB):
 	cd $(LUAJIT_HOME); @GMAKE@