Make PDF the default target

makefile

@@ -12,7 +12,7 @@ SONG_PDF := $(patsubst %$(SRC_EXTENSION),%.pdf,$(SONG_CHO))
 SONG_HTML := $(patsubst %$(SRC_EXTENSION),%.html,$(SONG_CHO))
 SONGBOOK := songbook.pdf
 
-.DEFAULT_GOAL := all
+.DEFAULT_GOAL := pdf
 
 %.pdf: %$(SRC_EXTENSION)
 	$(CHORDPRO_CMD) -o $@ $<
@@ -20,7 +20,7 @@ SONGBOOK := songbook.pdf
 %.html: %$(SRC_EXTENSION)
 	$(CHORDPRO_CMD) -o $@ $<
 
-all: $(SONG_PDF) $(SONG_HTML) $(SONGBOOK)
+all: pdf html songbook
 
 $(SONGBOOK): $(SONG_PDF)
 	gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=$@ $^
@@ -31,6 +31,10 @@ html: $(SONG_HTML)
 .PHONY: pdf
 pdf: $(SONG_PDF)
 
+.PHONY: songbook
+songbook: pdf
+	$(MAKE) $(SONGBOOK)
+
 .PHONY: clean
 clean:
 	rm -f $(SONG_PDF) $(SONG_HTML) $(SONGBOOK)