diff --git a/config/pac.m4 b/config/pac.m4
index 46a56b68..ecf8e475 100644
--- a/config/pac.m4
+++ b/config/pac.m4
@@ -363,6 +363,45 @@ fi
 ]
 )
 
+dnl @synopsis PAC_ARG_OPENMP
+dnl
+dnl Test for --enable-openmp
+dnl 
+dnl 
+dnl
+dnl Example use:
+dnl
+dnl
+dnl @author Salvatore Filippone <salvatore.filippone@uniroma2.it>
+dnl
+AC_DEFUN([PAC_ARG_OPENMP],
+[AC_MSG_CHECKING([whether we want openmp ])
+AC_ARG_ENABLE(openmp,
+AC_HELP_STRING([--enable-openmp], 
+[Specify whether to enable openmp. ]),
+[
+pac_cv_openmp="yes";
+]
+dnl ,
+dnl [pac_cv_openmp="no";]
+	     )
+if test x"$pac_cv_openmp" == x"yes" ; then
+   AC_MSG_RESULT([yes.])
+   AC_LANG_PUSH([Fortran])
+   AC_OPENMP() 
+   pac_cv_openmp_fcopt="$OPENMP_FCFLAGS";
+   AC_LANG_POP()
+   AC_LANG_PUSH([C])
+   AC_OPENMP() 
+   pac_cv_openmp_ccopt="$OPENMP_CFLAGS";
+   AC_LANG_POP()
+else
+ pac_cv_openmp="no";
+ AC_MSG_RESULT([no.])
+fi
+]
+)
+
 dnl @synopsis PAC_ARG_LONG_INTEGERS
 dnl
 dnl Test for --enable-long-integers
diff --git a/configure b/configure
index e8688547..4bd53950 100755
--- a/configure
+++ b/configure
@@ -663,6 +663,8 @@ BASEMODNAME
 CDEFINES
 FDEFINES
 LAPACK_LIBS
+OPENMP_CFLAGS
+OPENMP_FCFLAGS
 EGREP
 GREP
 CPP
@@ -771,6 +773,7 @@ enable_dependency_tracking
 enable_silent_rules
 with_ipk
 with_lpk
+enable_openmp
 with_blas
 with_blasdir
 with_lapack
@@ -1420,6 +1423,8 @@ Optional Features:
                           speeds up one-time build
   --enable-silent-rules   less verbose build output (undo: "make V=1")
   --disable-silent-rules  verbose build output (undo: "make V=0")
+  --enable-openmp         Specify whether to enable openmp.
+  --disable-openmp        do not use OpenMP
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -6890,7 +6895,187 @@ FDEFINES="$psblas_cv_define_prepend-DIPK${pac_cv_ipk_size} $FDEFINES";
 FDEFINES="$psblas_cv_define_prepend-DLPK${pac_cv_lpk_size} $FDEFINES";
 CDEFINES="-DIPK${pac_cv_ipk_size} -DLPK${pac_cv_lpk_size} $CDEFINES"
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether we want openmp " >&5
+$as_echo_n "checking whether we want openmp ... " >&6; }
+# Check whether --enable-openmp was given.
+if test "${enable_openmp+set}" = set; then :
+  enableval=$enable_openmp;
+pac_cv_openmp="yes";
 
+
+fi
+
+if test x"$pac_cv_openmp" == x"yes" ; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: yes." >&5
+$as_echo "yes." >&6; }
+   ac_ext=${ac_fc_srcext-f}
+ac_compile='$FC -c $FCFLAGS $ac_fcflags_srcext conftest.$ac_ext >&5'
+ac_link='$FC -o conftest$ac_exeext $FCFLAGS $LDFLAGS $ac_fcflags_srcext conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_fc_compiler_gnu
+
+
+  OPENMP_FCFLAGS=
+  # Check whether --enable-openmp was given.
+if test "${enable_openmp+set}" = set; then :
+  enableval=$enable_openmp;
+fi
+
+  if test "$enable_openmp" != no; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $FC option to support OpenMP" >&5
+$as_echo_n "checking for $FC option to support OpenMP... " >&6; }
+if ${ac_cv_prog_fc_openmp+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat > conftest.$ac_ext <<_ACEOF
+
+      program main
+      implicit none
+!$    integer tid
+      tid = 42
+      call omp_set_num_threads(2)
+      end
+
+_ACEOF
+if ac_fn_fc_try_link "$LINENO"; then :
+  ac_cv_prog_fc_openmp='none needed'
+else
+  ac_cv_prog_fc_openmp='unsupported'
+	  	  	  	  	  	  	                                	  	  	  	  	  	  for ac_option in -fopenmp -xopenmp -openmp -mp -omp -qsmp=omp -homp \
+                           -Popenmp --openmp; do
+	    ac_save_FCFLAGS=$FCFLAGS
+	    FCFLAGS="$FCFLAGS $ac_option"
+	    cat > conftest.$ac_ext <<_ACEOF
+
+      program main
+      implicit none
+!$    integer tid
+      tid = 42
+      call omp_set_num_threads(2)
+      end
+
+_ACEOF
+if ac_fn_fc_try_link "$LINENO"; then :
+  ac_cv_prog_fc_openmp=$ac_option
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+	    FCFLAGS=$ac_save_FCFLAGS
+	    if test "$ac_cv_prog_fc_openmp" != unsupported; then
+	      break
+	    fi
+	  done
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_fc_openmp" >&5
+$as_echo "$ac_cv_prog_fc_openmp" >&6; }
+    case $ac_cv_prog_fc_openmp in #(
+      "none needed" | unsupported)
+	;; #(
+      *)
+	OPENMP_FCFLAGS=$ac_cv_prog_fc_openmp ;;
+    esac
+  fi
+
+
+   pac_cv_openmp_fcopt="$OPENMP_FCFLAGS";
+   ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+   ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+  OPENMP_CFLAGS=
+  # Check whether --enable-openmp was given.
+if test "${enable_openmp+set}" = set; then :
+  enableval=$enable_openmp;
+fi
+
+  if test "$enable_openmp" != no; then
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $CC option to support OpenMP" >&5
+$as_echo_n "checking for $CC option to support OpenMP... " >&6; }
+if ${ac_cv_prog_c_openmp+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#ifndef _OPENMP
+ choke me
+#endif
+#include <omp.h>
+int main () { return omp_get_num_threads (); }
+
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_prog_c_openmp='none needed'
+else
+  ac_cv_prog_c_openmp='unsupported'
+	  	  	  	  	  	  	                                	  	  	  	  	  	  for ac_option in -fopenmp -xopenmp -openmp -mp -omp -qsmp=omp -homp \
+                           -Popenmp --openmp; do
+	    ac_save_CFLAGS=$CFLAGS
+	    CFLAGS="$CFLAGS $ac_option"
+	    cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+#ifndef _OPENMP
+ choke me
+#endif
+#include <omp.h>
+int main () { return omp_get_num_threads (); }
+
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_prog_c_openmp=$ac_option
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+	    CFLAGS=$ac_save_CFLAGS
+	    if test "$ac_cv_prog_c_openmp" != unsupported; then
+	      break
+	    fi
+	  done
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_prog_c_openmp" >&5
+$as_echo "$ac_cv_prog_c_openmp" >&6; }
+    case $ac_cv_prog_c_openmp in #(
+      "none needed" | unsupported)
+	;; #(
+      *)
+	OPENMP_CFLAGS=$ac_cv_prog_c_openmp ;;
+    esac
+  fi
+
+
+   pac_cv_openmp_ccopt="$OPENMP_CFLAGS";
+   ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+else
+ pac_cv_openmp="no";
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: no." >&5
+$as_echo "no." >&6; }
+fi
+
+
+FCOPT="$FCOPT $pac_cv_openmp_fcopt";
+CCOPT="$CCOPT $pac_cv_openmp_ccopt";
+{ $as_echo "$as_me:${as_lineno-$LINENO}: \"FLAGS: $FCOPT $OPENMP_FFLAGS\"" >&5
+$as_echo "$as_me: \"FLAGS: $FCOPT $OPENMP_FFLAGS\"" >&6;}
 #
 # Tests for support of various Fortran features; some of them are critical,
 # some optional
diff --git a/configure.ac b/configure.ac
index a2650489..27d62789 100755
--- a/configure.ac
+++ b/configure.ac
@@ -498,7 +498,10 @@ FDEFINES="$psblas_cv_define_prepend-DIPK${pac_cv_ipk_size} $FDEFINES";
 FDEFINES="$psblas_cv_define_prepend-DLPK${pac_cv_lpk_size} $FDEFINES";	
 CDEFINES="-DIPK${pac_cv_ipk_size} -DLPK${pac_cv_lpk_size} $CDEFINES"
 
-
+PAC_ARG_OPENMP()
+FCOPT="$FCOPT $pac_cv_openmp_fcopt";
+CCOPT="$CCOPT $pac_cv_openmp_ccopt";
+AC_MSG_NOTICE(["FLAGS: $FCOPT $OPENMP_FFLAGS"])
 #
 # Tests for support of various Fortran features; some of them are critical,
 # some optional