Upstream style file relies on font files being present on the system
globally.  This is not quite how Nix usually does thing, so this patch
changes the style file to instead look fonts up in hardcoded
locations, which are later patched up to refer to the package outputs,
thus ensuring the style always uses the fonts packaged with it.

diff --git a/TeX/junicode.sty b/TeX/junicode.sty
index 3f80068..af3e3ba 100644
--- a/TeX/junicode.sty
+++ b/TeX/junicode.sty
@@ -211,7 +211,14 @@
 
 \RequirePackage{fontspec}
 \defaultfontfeatures{Ligatures=TeX, Extension=.\junicode@fonttype}
-\defaultfontfeatures{Ligatures=TeX}
+
+\def\junicode@fonttype@otf{otf}
+
+\ifx\junicode@fonttype\junicode@fonttype@otf
+  \def\junicode@fontpath{@@@opentype_path@@@}
+\else
+  \def\junicode@fontpath{@@@truetype_path@@@}
+\fi
 
 \ifxetex
 \typeout{\junicode@regstylename}
@@ -222,6 +229,7 @@
    ItalicFont =        *-\junicode@italstylename,
    BoldFont =          *-\junicode@boldstylename,
    BoldItalicFont =    *-\junicode@boldstylename Italic,
+   Path =              \junicode@fontpath,
   ]{Junicode}
 \fi
 \ifluatex
@@ -233,6 +241,7 @@
    ItalicFont =        *-\junicode@italstylename,
    BoldFont =          *-\junicode@boldstylename,
    BoldItalicFont =    *-\junicode@boldstylename Italic,
+   Path =              \junicode@fontpath,
   ]{Junicode}
 \fi
 
@@ -245,6 +254,7 @@
         #3
         Numbers =           {\junicode@figurealign,\junicode@figurestyle},
         SmallCapsFeatures = {Letters=SmallCaps},
+        Path =              \junicode@fontpath,
     ]
 }
 \fi
@@ -255,6 +265,7 @@
         #3
         Numbers =           {\junicode@figurealign,\junicode@figurestyle},
         SmallCapsFeatures = {Letters=SmallCaps},
+        Path =              \junicode@fontpath,
     ]
 }
 \fi
diff --git a/TeX/junicodevf.lua b/TeX/junicodevf.lua
index 9c58f79..6ddcb55 100644
--- a/TeX/junicodevf.lua
+++ b/TeX/junicodevf.lua
@@ -118,7 +118,7 @@ function mkfontcommands()
          romfontcmd = "jRegular"
          italfontcmd = "jItalic"
       end
-      tex.print("\\junicodevf@newfont{\\" .. romfontcmd .. "}{JunicodeVF}{\\" .. defcmd .. "}{\\" .. defsizecmd .. "}")
+      tex.print("\\junicodevf@newfont{\\" .. romfontcmd .. "}{JunicodeVF-Roman}{\\" .. defcmd .. "}{\\" .. defsizecmd .. "}")
       tex.print("\\junicodevf@newfont{\\" .. italfontcmd .. "}{JunicodeVF-Italic}{\\" .. defcmd .. "}{\\" .. defsizecmd .. "}")
    end
 end
diff --git a/TeX/junicodevf.sty b/TeX/junicodevf.sty
index da987d0..4475add 100644
--- a/TeX/junicodevf.sty
+++ b/TeX/junicodevf.sty
@@ -132,10 +132,12 @@ mkmainfontcommand(style_idx, weight_option, weight_adjust, width_option, width_a
 % Set the main font, then the alternate styles. It appears that
 % the fonts aren't embedded in the PDF unless actually used.
 
-\setmainfont{JunicodeVF}[
-    ItalicFont =         {*-Italic},
-    BoldFont =           {*},
-    BoldItalicFont =     {*-Italic},
+\setmainfont{JunicodeVF-Roman}[
+    ItalicFont =         {JunicodeVF-Italic},
+    BoldFont =           {JunicodeVF-Roman},
+    BoldItalicFont =     {JunicodeVF-Italic},
+    Extension =          .ttf,
+    Path =               @@@truetype_path@@@,
     Renderer =           {\junicodevf@renderer},
     Numbers =            {\junicodevf@figurealign,\junicodevf@figurestyle},
     \MainDef,
@@ -152,6 +154,8 @@ mkmainfontcommand(style_idx, weight_option, weight_adjust, width_option, width_a
 \newcommand*{\junicodevf@newfont}[4]{
     \setfontface#1{#2}[
         Renderer =          {\junicodevf@renderer},
+        Extension =          .ttf,
+        Path =               @@@truetype_path@@@,
         Numbers =           {\junicodevf@figurealign,\junicodevf@figurestyle},
         SmallCapsFont =     {*},
         SmallCapsFeatures = {Letters=SmallCaps},
@@ -164,43 +168,60 @@ mkmainfontcommand(style_idx, weight_option, weight_adjust, width_option, width_a
 
 % ENLARGED FACES
 
-\setfontface\EnlargedOne{JunicodeVF}[
+\setfontface\EnlargedOne{JunicodeVF-Roman}[
     Renderer = {\junicodevf@renderer},
+    Extension = .ttf,
+    Path = @@@truetype_path@@@,
     \ENLAOneSizeDef
 ]
 
 \setfontface\EnlargedOneItalic{JunicodeVF-Italic}[
     Renderer = {\junicodevf@renderer},
+    Renderer = HarfBuzz,
+    Extension = .ttf,
+    Path = @@@truetype_path@@@,
     \ENLAOneSizeDef
 ]
 
-\setfontface\EnlargedTwo{JunicodeVF}[
+\setfontface\EnlargedTwo{JunicodeVF-Roman}[
     Renderer = {\junicodevf@renderer},
+    Extension = .ttf,
+    Path = @@@truetype_path@@@,
     \ENLATwoSizeDef
 ]
 
 \setfontface\EnlargedTwoItalic{JunicodeVF-Italic}[
     Renderer = {\junicodevf@renderer},
+    Extension = .ttf,
+    Path = @@@truetype_path@@@,
     \ENLATwoSizeDef
 ]
 
-\setfontface\EnlargedThree{JunicodeVF}[
+\setfontface\EnlargedThree{JunicodeVF-Roman}[
     Renderer = {\junicodevf@renderer},
+    Extension = .ttf,
+    Path = @@@truetype_path@@@,
     \ENLAThreeSizeDef
 ]
 
 \setfontface\EnlargedThreeItalic{JunicodeVF-Italic}[
     Renderer = {\junicodevf@renderer},
+    Extension = .ttf,
+    Path = @@@truetype_path@@@,
     \ENLAThreeSizeDef
 ]
 
-\setfontface\EnlargedFour{JunicodeVF}[
+\setfontface\EnlargedFour{JunicodeVF-Roman}[
     Renderer = {\junicodevf@renderer},
+    Extension = .ttf,
+    Path = @@@truetype_path@@@,
     \ENLAFourSizeDef
 ]
 
 \setfontface\EnlargedFourItalic{JunicodeVF-Italic}[
     Renderer = {\junicodevf@renderer},
+    Extension = .ttf,
+    Path = @@@truetype_path@@@,
     \ENLAFourSizeDef
 ]