Fix make distcheck
diff --git a/src/libFLAC/include/private/Makefile.am b/src/libFLAC/include/private/Makefile.am
index 62d8a18..2e33dc7 100644
--- a/src/libFLAC/include/private/Makefile.am
+++ b/src/libFLAC/include/private/Makefile.am
@@ -39,6 +39,7 @@
 	float.h \
 	format.h \
 	lpc.h \
+	macros.h \
 	md5.h \
 	memory.h \
 	metadata.h \