--- apngasm-2.91-src/Makefile
+++ apngasm-2.91-src/Makefile
@@ -1,8 +1,7 @@
 PACKAGE    = apngasm
 CC         = gcc
-SRC_DIRS   = . 7z zopfli
-CFLAGS     = -Wall -pedantic -DFEATURE_7ZIP -DFEATURE_ZOPFLI
-CFLAGS_OPT = -O2
+SRC_DIRS   = . 7z
+CFLAGS     += -Wall -pedantic
 CFLAGS_7Z  = -Wno-sign-compare -Wno-reorder -Wno-maybe-uninitialized -Wno-parentheses
 LIBS       = -lstdc++ -lm -lpng -lz
 
@@ -16,7 +15,7 @@
 all : $(PACKAGE)
 
 $(PACKAGE) : objdirs $(OBJECTS)
-	$(CC) -o $@ $(OBJECTS) -s $(LIBS)
+	$(CC) -o $@ $(OBJECTS) $(LDFLAGS) $(LIBS)
 
 objdirs :
 	mkdir -p $(OBJ_DIRS)