Enable LaTeX support in gnuplot.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

Formula/gnuplot.rb

@@ -16,6 +16,7 @@ class Gnuplot < Formula
   option 'nogd',   'Build without gd support'
   option 'tests',  'Verify the build with make check (1 min)'
   option 'without-emacs', 'Do not build Emacs lisp files'
+  option 'latex',  'Build with LaTeX support'
 
   if build.head?
     depends_on :automake
@@ -31,6 +32,7 @@ class Gnuplot < Formula
   depends_on 'gd'          unless build.include? 'nogd'
   depends_on 'wxmac'       if build.include? 'wx'
   depends_on 'qt'          if build.include? 'qt'
+  depends_on :tex          if build.include? 'latex'
 
   def install
     # Help configure find libraries
@@ -42,8 +44,6 @@ class Gnuplot < Formula
       --disable-dependency-tracking
       --prefix=#{prefix}
       --with-readline=#{readline.opt_prefix}
-      --without-latex
-      --without-tutorial
     ]
 
     args << "--with-pdf=#{pdflib.opt_prefix}" if build.include? 'pdf'
@@ -54,6 +54,14 @@ class Gnuplot < Formula
     args << '--without-lua'           if build.include? 'nolua'
     args << '--without-lisp-files'    if build.include? 'without-emacs'
 
+    if build.include? 'latex'
+      args << '--with-latex'
+      args << '--with-tutorial'
+    else
+      args << '--without-latex'
+      args << '--without-tutorial'
+    end
+
     system './prepare' if build.head?
     system "./configure", *args
     ENV.j1 # or else emacs tries to edit the same file with two threads