diff --git a/latex/maketd.py b/latex/maketd.py
index b733054..d94affb 100755
--- a/latex/maketd.py
+++ b/latex/maketd.py
@@ -4,26 +4,31 @@ import subprocess
 import sys
 import os
 
-def compiler(nf, lsuff) :
+def compiler(nf, lsuff, parallel = False) :
    basedir = os.path.dirname(nf)
    builddir = os.path.join(basedir, "_build")
    basejobname = os.path.splitext(os.path.basename(nf))[0]
+   if parallel :
+      call = subprocess.Popen
+   else :
+      call = subprocess.call
    # https://stackoverflow.com/a/9745864
    processes = []
    for suff in lsuff :
       options = suff[1]
-      processes.append(subprocess.Popen('''latexmk -pdflua -shell-escape -bibtex-cond -cd -interaction=batchmode -dvi- -jobname=''' +basejobname+suff[0] +''' -outdir=''' + builddir + ''' -latexoption="--output-directory='''+builddir+''' --synctex=0 ''' + options + '''" ''' + nf, shell=True, stdout=subprocess.PIPE,
+      processes.append(call('''latexmk -pdflua -shell-escape -bibtex-cond -cd -interaction=batchmode -dvi- -jobname=''' +basejobname+suff[0] +''' -outdir=''' + builddir + ''' -latexoption="--output-directory='''+builddir+''' --synctex=0 ''' + options + '''" ''' + nf, shell=True, stdout=subprocess.PIPE,
                    bufsize=1, close_fds=True,
                    universal_newlines=True))
-   while len(processes) > 0 :
-      for p in processes:
-            if p.poll() is not None: # process ended
-                  p.stdout.close()
-                  processes.remove(p)
+   if parallel :
+      while len(processes) > 0 :
+         for p in processes:
+               if p.poll() is not None: # process ended
+                     p.stdout.close()
+                     processes.remove(p)
    for suff in lsuff :
       os.rename(os.path.join(builddir, basejobname+suff[0]+".pdf"), os.path.join(basedir, basejobname+suff[0]+".pdf"))
-   
-   
+
+
 
 def clean(nf, suff) :
    subprocess.call(["latexmk", "-cd", "-c",  "-jobname="+os.path.splitext(os.path.basename(nf))[0]+suff, nf])
@@ -33,7 +38,6 @@ if sys.argv[1].endswith(".tex") :
 else :
    nf = sys.argv[1]+".tex"
 
-
 with open(nf) as f :
    for l in f.readlines() :
       if l.strip() == "" or l.strip().startswith("%") :
@@ -47,5 +51,5 @@ with open(nf) as f :
       break
 
 
-compiler(nf, modes)
+compiler(nf, modes, len(sys.argv)>2 and sys.argv[2]=="--parallel")