--- buffer-1.19/Makefile
+++ buffer-1.19/Makefile
@@ -10,7 +10,8 @@
 #   Ampex drives, such as the DST 310.
 
 CC=gcc
-CFLAGS=-Wall -O2 -fomit-frame-pointer -pipe
+CFLAGS?=-Wall -O2 -fomit-frame-pointer -pipe
+LDFLAGS?=
 
 # Where to install buffer and its manual pages
 INSTBIN=/usr/bin
@@ -28,7 +29,7 @@
 sem.o: sem.c
 
 buffer: buffer.o sem.o
-	$(CC) -o buffer $(CFLAGS) buffer.o sem.o
+	$(CC) -o buffer $(CFLAGS) buffer.o sem.o $(LDFLAGS)
 
 clean:
 	$(RM) -f *.o core buffer .merrs