MANDIR, not DOCDIR
diff --git a/Makefile b/Makefile
index b22eec7..b239cb0 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,7 @@ SRCS = git-auth.c \
sympackage.c sympackage.h
BINDIR ?= /usr/local/bin
-DOCDIR ?= /usr/local/share/doc
+MANDIR ?= /usr/local/share/man/man
build: ${PROG}