set hsize for plain tex, but only for

positive line widths.

diff --git a/tex/lilyponddefs.tex b/tex/lilyponddefs.tex
index 5cef0c11dd386c80716adaa19dfb016020902913..cf7bf1f791aea5424f06d233966d3a18f25b72e9 100644 (file)
--- a/tex/lilyponddefs.tex
+++ b/tex/lilyponddefs.tex
@@ -42,8 +42,11 @@
   \input lilypond-plaintex
 
 %% make plain work ok Out Of The Box
-  \ifdim0pt<\lilypondpaperlinewidth\lilypondpaperunit
-  \hsize=\lilypondpaperlinewidth\lilypondpaperunit
+  \ifundefined{lilypondpaperunit}
+  \else
+    \ifdim0pt<\lilypondpaperlinewidth\lilypondpaperunit
+      \hsize=\lilypondpaperlinewidth\lilypondpaperunit
+    \fi
   \fi
 \else
   \input lilypond-latex