format-patch: add --interdiff option to embed diff in cover letter

diff --git a/Makefile b/Makefile
index 08e5c545492c7261dea349d002aef8d3ea1d232f..b2685190e1d9a6c0ad39bf3f5a6bd9a4e84f7273 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -871,6 +871,7 @@ LIB_OBJS += hashmap.o
 LIB_OBJS += help.o
 LIB_OBJS += hex.o
 LIB_OBJS += ident.o
+LIB_OBJS += interdiff.o
 LIB_OBJS += kwset.o
 LIB_OBJS += levenshtein.o
 LIB_OBJS += line-log.o