makefile: fix "make doc" by adding the necessary .PHONY.

diff --git a/makefile b/makefile
index 41b916c8eeba2c7c5ff2c35f00410cd6e9bacc71..e77b22752ece367de4cd88c66533e3d7c234be22 100644 (file)
--- a/makefile
+++ b/makefile
@@ -16,7 +16,7 @@ HCFLAGS += -Weverything \
            -rtsopts \
            -threaded
 
-.PHONY : test dist hlint
+.PHONY : doc test dist hlint
 
 $(BIN): $(PN).cabal src/*.hs
        runghc Setup.hs clean