Description: allow to override $CXX
Author: Sascha Steinbiss <satta@debian.org>
--- a/src/Makefile
+++ b/src/Makefile
@@ -28,9 +28,9 @@ COMMON=-g
 LIBS=-lpthread
 LINKFLAGS=$(COMMON) $(LDFLAGS)
 
-CXX=g++
+CXX?=g++
 WARNINGS=-Wall -Wsign-compare -Wextra -Wpedantic -Wno-long-long
-CXXFLAGS=$(COMMON) $(WARNINGS) -O3 -msse2 -mtune=core2 -Icityhash
+CXXFLAGS+=$(COMMON) $(WARNINGS) -O3 -msse2 -mtune=core2 -Icityhash
 
 PROG=swarm