doc build: Create lilypond-internals/source, so rewriting links works

diff --git a/Documentation/user/GNUmakefile b/Documentation/user/GNUmakefile
index 0e1166acbbcc984678123df0624ca6511f5010a3..5d7affd551c9cf067a1dd543d99449cc6ec63adc 100644 (file)
--- a/Documentation/user/GNUmakefile
+++ b/Documentation/user/GNUmakefile
@@ -115,7 +115,7 @@ DEEP_HTML_FILES =\
 
 # Symlinks to refer to external source documents from split and non-split HTML
 source-links = $(outdir)/source $(outdir)/lilypond/source $(outdir)/music-glossary/source \
- $(outdir)/lilypond-program/source $(outdir)/lilypond-learning/source
+ $(outdir)/lilypond-program/source $(outdir)/lilypond-learning/source $(outdir)/lilypond-internals/source
 
 $(outdir)/source:
        @rm -f $(@)