Travis CI : added ARM compilation tests
diff --git a/lib/Makefile b/lib/Makefile
index 4d83816..46000f7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -41,7 +41,9 @@
 DESTDIR?=
 PREFIX ?= /usr
 CFLAGS ?= -O3
-CFLAGS += -I. -std=c99 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wstrict-prototypes
+CFLAGS += -std=c99 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wstrict-prototypes
+LDFLAGS = -I.
+FLAGS   = $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) $(MOREFLAGS)
 
 LIBDIR ?= $(PREFIX)/lib
 INCLUDEDIR=$(PREFIX)/include
@@ -67,10 +69,10 @@
 
 libzstd: zstd.c
 	@echo compiling static library
-	@$(CC) $(CPPFLAGS) $(CFLAGS) -c $^
+	@$(CC) $(FLAGS) -c $^
 	@$(AR) rcs libzstd.a zstd.o
 	@echo compiling dynamic library $(LIBVER)
-	@$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -shared $^ -fPIC $(SONAME_FLAGS) -o $@.$(SHARED_EXT_VER)
+	@$(CC) $(FLAGS) -shared $^ -fPIC $(SONAME_FLAGS) -o $@.$(SHARED_EXT_VER)
 	@echo creating versioned links
 	@ln -sf $@.$(SHARED_EXT_VER) $@.$(SHARED_EXT_MAJOR)
 	@ln -sf $@.$(SHARED_EXT_VER) $@.$(SHARED_EXT)