diff --git a/.merlin b/.merlin
index 548e65e..c5ed8ad 100644
--- a/.merlin
+++ b/.merlin
@@ -2,6 +2,7 @@ PKG str unix bigarray lacaml
 S .
 S Test
 S Nuclei
+S Parallel
 S CI
 S Utils
 S Basis
diff --git a/Makefile.include b/Makefile.include
index 2642376..433efa0 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -7,8 +7,8 @@ OCAMLBUILD=ocamlbuild -j 0 -cflags $(ocamlcflags) -lflags $(ocamllflags) $(ocaml
 
 MLLFILES=$(wildcard */*.mll) $(wildcard *.mll) Utils/math_functions.c
 MLYFILES=$(wildcard */*.mly) $(wildcard *.mly) 
-MLFILES= $(wildcard */*.ml)  $(wildcard *.ml) 
-MLIFILES=$(wildcard */*.mli) $(wildcard *.mli) 
+MLFILES= $(filter-out $(wildcard Parallel_*/*), $(wildcard */*.ml)  $(wildcard *.ml) )
+MLIFILES=$(filter-out $(wildcard Parallel_*/*), $(wildcard */*.mli) $(wildcard *.mli) )
 
 ALL_NATIVE=$(patsubst %.ml,%.native,$(wildcard run_*.ml)) 
 ALL_BYTE=$(patsubst %.ml,%.byte,$(wildcard run_*.ml)) 
diff --git a/configure b/configure
index b0502e6..d8bddaf 100755
--- a/configure
+++ b/configure
@@ -77,7 +77,7 @@ while : ; do
             shift;;
         -mpi|--mpi)
             mpi='-tag "package(mpi)"';;
-        -help|--help)
+        -h|-help|--help)
             help;;
         *)
             echo "Unknown option $1, try -help"
@@ -87,7 +87,7 @@ while : ; do
 done
 
 rm -f Parallel
-if [[ -n $mpi ]] ; then
+if [ "x.$mpi" != "x." ] ; then
   ln -s Parallel_mpi Parallel
 else
   ln -s Parallel_serial Parallel