--- ./Makefile	2024-08-25 23:22:11
+++ ./Makefile	2024-08-25 23:23:26
@@ -1,9 +1,12 @@
 -include config.mk
 
+PREFIX ?= /opt/local
+
 CC ?= /usr/bin/cc
-CFLAGS = -O3 -Wall -Wextra -I/usr/local/include
-LDFLAGS = -L/usr/local/lib -lpng
-VERSION = 1.0
+CFLAGS ?= -O3 -Wall -Wextra -I$(PREFIX)/include
+LDFLAGS ?= -L$(PREFIX)/lib
+DEFAULT_LDFLAGS = -lpng
+VERSION ?= 1.0
 
 BIN ?= pngloss
 DESTDIR ?= /usr/local
@@ -19,7 +22,7 @@
 all: $(BIN)
 
 $(BIN): $(OBJS)
-	$(CC) $(OBJS) $(CFLAGS) $(LDFLAGS) -o $@
+	$(CC) $(OBJS) $(CFLAGS) $(DEFAULT_LDFLAGS) $(LDFLAGS) -o $@
 
 dist: $(TARFILE)