Removed -pthread and -fno-strict-aliasing flags

Makefile

@@ -28,7 +28,7 @@ HDRS := $(filter-out $(LIBNAME).hpp,$(wildcard *.hpp))
 
 CXX ?= g++
 
-CXXFLAGS := $(CXXFLAGS) -Wshadow -Wall -Wpedantic -Wextra -g -fno-strict-aliasing -std=c++17 -fPIC
+CXXFLAGS += -Wshadow -Wall -Wpedantic -Wextra -g -std=c++17 -fPIC
 ifeq ($(DEBUG),1)
 	CXXFLAGS += -D DEBUG -O0
 else