Index: Makefile
--- Makefile.orig	2016-05-19 18:36:31.000000000 +0200
+++ Makefile	2016-07-02 11:29:55.472135981 +0200
@@ -18,11 +18,11 @@
 OBJ += comp-zlib.o
 else
 OBJ += comp-zopfli.o
-LDFLAGS += -lm
+LIBS += -lm
 endif
 
 CFLAGS ?= -O2 -g
-LDFLAGS += -lz
+LIBS += -lz
 
 # eg. make WIN32=1 CC=mingw32-gcc RC=mingw32-windres
 ifdef WIN32
@@ -32,7 +32,7 @@
 endif
 
 ttf2woff$(EXE): $(OBJ)
-	$(CC) -o $@ $(OBJ) $(LDFLAGS)
+	$(CC) -o $@ $(OBJ) $(LDFLAGS) $(LIBS)
 
 ttf2woff.o: ttf2woff.c ttf2woff.h Makefile
 	$(CC) $(CFLAGS) -DVERSION=$(VERSION) -c ttf2woff.c
