improve Makefile

doc/examples/softwaresite.mdwn

@@ -8,6 +8,6 @@ Some additional configuration you might want to do:
 
 * The softwaresite/doc subdirectory is intended to hold docs about your
   software package. These docs can be included in the package itself;
-  there is a [[softwaresite/doc/Makefile]] that will use ikiwiki to build
-  static html documentation from the docs directory. ikiwiki itself uses a
-  similar system to build its documentation.
+  there is a [[softwaresite/Makefile]] that will use ikiwiki to build
+  static html documentation. ikiwiki itself uses a similar system to build
+  its documentation.

doc/examples/softwaresite/Makefile

@@ -0,0 +1,15 @@
+# Build static html docs suitable for being shipped in the software
+# package. This depends on ikiwiki being installed to build the docs.
+
+ifeq ($(shell which ikiwiki),)
+IKIWIKI=echo "** ikiwiki not found" >&2 ; echo ikiwiki
+else
+IKIWIKI=ikiwiki
+endif
+
+all:
+	$(IKIWIKI) `pwd` html -v --plugin=goodstuff \
+		--no-rcs --exclude=/discussion --exclude=html --no-discussion
+
+clean:
+	rm -rf .ikiwiki html

doc/examples/softwaresite/doc/Makefile

@@ -1,9 +0,0 @@
-# Build static html docs suitable for being shipped in the software
-# package.
-
-all:
-	ikiwiki `pwd` html -v --plugin=goodstuff \
-		--no-rcs --exclude=/discussion --exclude=html --no-discussion
-
-clean:
-	rm -rf .ikiwiki