configure

# Check whether --enable-best-link was given.
if test "${enable_best_link+set}" = set; then
  enableval=$enable_best_link; use_best="yes"
	{ $as_echo "$as_me:$LINENO: result: yes" >&5
$as_echo "yes" >&6; }
else
  use_best="no"
	{ $as_echo "$as_me:$LINENO: result: no" >&5
$as_echo "no" >&6; }
fi


################# Actions to complete in case of multhreading ################

cat >>confdefs.h <<_ACEOF
#define THREADS_NMAX $n_pthreads
_ACEOF

if test "$use_pthreads" = "yes"; then
  { $as_echo "$as_me:$LINENO: checking for multithreading" >&5
$as_echo_n "checking for multithreading... " >&6; }
  { $as_echo "$as_me:$LINENO: result: maximum of $n_pthreads thread(s)" >&5
$as_echo "maximum of $n_pthreads thread(s)" >&6; }

cat >>confdefs.h <<\_ACEOF
#define USE_THREADS 1
_ACEOF

# CC, CFLAGS and LIBS are system and compiler-dependent


acx_pthread_ok=no

# First, check if the POSIX threads header, pthread.h, is available.
# If it isn't, don't bother looking for the threads libraries.
# AC_CHECK_HEADER(pthread.h, , acx_pthread_ok=noheader)
if test "${ac_cv_header_pthread_h+set}" = set; then
  { $as_echo "$as_me:$LINENO: checking for pthread.h" >&5
$as_echo_n "checking for pthread.h... " >&6; }
if test "${ac_cv_header_pthread_h+set}" = set; then
  $as_echo_n "(cached) " >&6
fi
{ $as_echo "$as_me:$LINENO: result: $ac_cv_header_pthread_h" >&5
$as_echo "$ac_cv_header_pthread_h" >&6; }
else
  # Is the header compilable?
{ $as_echo "$as_me:$LINENO: checking pthread.h usability" >&5
$as_echo_n "checking pthread.h usability... " >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
$ac_includes_default
#include <pthread.h>
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_compile") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } && {
	 test -z "$ac_c_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest.$ac_objext; then
  ac_header_compiler=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

	ac_header_compiler=no
fi

rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
{ $as_echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
$as_echo "$ac_header_compiler" >&6; }

# Is the header present?
{ $as_echo "$as_me:$LINENO: checking pthread.h presence" >&5
$as_echo_n "checking pthread.h presence... " >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
#include <pthread.h>
_ACEOF
if { (ac_try="$ac_cpp conftest.$ac_ext"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } >/dev/null && {
	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
	 test ! -s conftest.err
       }; then
  ac_header_preproc=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

  ac_header_preproc=no
fi

rm -f conftest.err conftest.$ac_ext
{ $as_echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
$as_echo "$ac_header_preproc" >&6; }

# So?  What about this header?
case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
  yes:no: )
    { $as_echo "$as_me:$LINENO: WARNING: pthread.h: accepted by the compiler, rejected by the preprocessor!" >&5
$as_echo "$as_me: WARNING: pthread.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: pthread.h: proceeding with the compiler's result" >&5
$as_echo "$as_me: WARNING: pthread.h: proceeding with the compiler's result" >&2;}
    ac_header_preproc=yes
    ;;
  no:yes:* )
    { $as_echo "$as_me:$LINENO: WARNING: pthread.h: present but cannot be compiled" >&5
$as_echo "$as_me: WARNING: pthread.h: present but cannot be compiled" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: pthread.h:     check for missing prerequisite headers?" >&5
$as_echo "$as_me: WARNING: pthread.h:     check for missing prerequisite headers?" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: pthread.h: see the Autoconf documentation" >&5
$as_echo "$as_me: WARNING: pthread.h: see the Autoconf documentation" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: pthread.h:     section \"Present But Cannot Be Compiled\"" >&5
$as_echo "$as_me: WARNING: pthread.h:     section \"Present But Cannot Be Compiled\"" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: pthread.h: proceeding with the preprocessor's result" >&5
$as_echo "$as_me: WARNING: pthread.h: proceeding with the preprocessor's result" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: pthread.h: in the future, the compiler will take precedence" >&5
$as_echo "$as_me: WARNING: pthread.h: in the future, the compiler will take precedence" >&2;}
    ( cat <<\_ASBOX
## ---------------------------- ##
## Report this to bertin@iap.fr ##
## ---------------------------- ##
_ASBOX
     ) | sed "s/^/$as_me: WARNING:     /" >&2
    ;;
esac
{ $as_echo "$as_me:$LINENO: checking for pthread.h" >&5
$as_echo_n "checking for pthread.h... " >&6; }
if test "${ac_cv_header_pthread_h+set}" = set; then
  $as_echo_n "(cached) " >&6
else
  ac_cv_header_pthread_h=$ac_header_preproc
fi
{ $as_echo "$as_me:$LINENO: result: $ac_cv_header_pthread_h" >&5
$as_echo "$ac_cv_header_pthread_h" >&6; }

fi
if test "x$ac_cv_header_pthread_h" = x""yes; then
  :
else
  acx_pthread_ok=no
fi



# We must check for the threads library under a number of different
# names; the ordering is very important because some systems
# (e.g. DEC) have both -lpthread and -lpthreads, where one of the
# libraries is broken (non-POSIX).

# First of all, check if the user has set any of the PTHREAD_LIBS,
# etcetera environment variables, and if threads linking works using
# them:
if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
        save_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
        save_LIBS="$LIBS"
        LIBS="$PTHREAD_LIBS $LIBS"
        { $as_echo "$as_me:$LINENO: checking for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS" >&5
$as_echo_n "checking for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS... " >&6; }
        cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */

/* Override any GCC internal prototype to avoid an error.
   Use char because int might match the return type of a GCC
   builtin and then its argument prototype would still apply.  */
#ifdef __cplusplus
extern "C"
#endif
char pthread_join ();
int
main ()
{
return pthread_join ();
  ;
  return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_link") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } && {
	 test -z "$ac_c_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest$ac_exeext && {
	 test "$cross_compiling" = yes ||
	 $as_test_x conftest$ac_exeext
       }; then
  acx_pthread_ok=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5


fi

rm -rf conftest.dSYM
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
      conftest$ac_exeext conftest.$ac_ext
        { $as_echo "$as_me:$LINENO: result: $acx_pthread_ok" >&5
$as_echo "$acx_pthread_ok" >&6; }
        if test x"$acx_pthread_ok" = xno; then
                PTHREAD_LIBS=""
                PTHREAD_CFLAGS=""
        fi
        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"
fi

# Create a list of thread flags to try.  Items starting with a "-" are
# C compiler flags, and other items are library names, except for "none"
# which indicates that we try without any flags at all.

acx_pthread_flags="pthreads none -Kthread -kthread lthread pthread -pthread -pthreads -mthreads --thread-safe -mt"

# The ordering *is* (sometimes) important.  Some notes on the
# individual items follow:

# pthreads: AIX (must check this before -lpthread)
# none: in case threads are in libc; should be tried before -Kthread and
#       other compiler flags to prevent continual compiler warnings
# -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
# -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
# lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
# -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
# -pthreads: Solaris/gcc
# -mthreads: Mingw32/gcc, Lynx/gcc
# -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
#      doesn't hurt to check since this sometimes defines pthreads too;
#      also defines -D_REENTRANT)
# pthread: Linux, etcetera
# --thread-safe: KAI C++

case "${host_cpu}-${host_os}" in
        *solaris*)

        # On Solaris (at least, for some versions), libc contains stubbed
        # (non-functional) versions of the pthreads routines, so link-based
        # tests will erroneously succeed.  (We need to link with -pthread or
        # -lpthread.)  (The stubs are missing pthread_cleanup_push, or rather
        # a function called by this macro, so we could check for that, but
        # who knows whether they'll stub that too in a future libc.)  So,
        # we'll just look for -pthreads and -lpthread first:

        acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
        ;;
esac

if test x"$acx_pthread_ok" = xno; then
for flag in $acx_pthread_flags; do

        case $flag in
                none)
                { $as_echo "$as_me:$LINENO: checking whether pthreads work without any flags" >&5
$as_echo_n "checking whether pthreads work without any flags... " >&6; }
                ;;

                -*)
                { $as_echo "$as_me:$LINENO: checking whether pthreads work with $flag" >&5
$as_echo_n "checking whether pthreads work with $flag... " >&6; }
                PTHREAD_CFLAGS="$flag"
                ;;

                *)
                { $as_echo "$as_me:$LINENO: checking for the pthreads library -l$flag" >&5
$as_echo_n "checking for the pthreads library -l$flag... " >&6; }
                PTHREAD_LIBS="-l$flag"
                ;;
        esac

        save_LIBS="$LIBS"
        save_CFLAGS="$CFLAGS"
        LIBS="$PTHREAD_LIBS $LIBS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"

        # Check for various functions.  We must include pthread.h,
        # since some functions may be macros.  (On the Sequent, we
        # need a special flag -Kthread to make this header compile.)
        # We check for pthread_join because it is in -lpthread on IRIX
        # while pthread_create is in libc.  We check for pthread_attr_init
        # due to DEC craziness with -lpthreads.  We check for
        # pthread_cleanup_push because it is one of the few pthread
        # functions on Solaris that doesn't have a non-functional libc stub.
        # We try pthread_create on general principles.
        cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
#include <pthread.h>
int
main ()
{
pthread_t th; pthread_join(th, 0);
                     pthread_attr_init(0); pthread_cleanup_push(0, 0);
                     pthread_create(0,0,0,0); pthread_cleanup_pop(0);
  ;
  return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_link") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } && {
	 test -z "$ac_c_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest$ac_exeext && {
	 test "$cross_compiling" = yes ||
	 $as_test_x conftest$ac_exeext
       }; then
  acx_pthread_ok=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5


fi

rm -rf conftest.dSYM
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
      conftest$ac_exeext conftest.$ac_ext

        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"

        { $as_echo "$as_me:$LINENO: result: $acx_pthread_ok" >&5
$as_echo "$acx_pthread_ok" >&6; }
        if test "x$acx_pthread_ok" = xyes; then
                break;
        fi

        PTHREAD_LIBS=""
        PTHREAD_CFLAGS=""
done
fi

# Various other checks:
if test "x$acx_pthread_ok" = xyes; then
        save_LIBS="$LIBS"
        LIBS="$PTHREAD_LIBS $LIBS"
        save_CFLAGS="$CFLAGS"
        CFLAGS="$CFLAGS $PTHREAD_CFLAGS"

        # Detect AIX lossage: threads are created detached by default
        # and the JOINABLE attribute has a nonstandard name (UNDETACHED).
        { $as_echo "$as_me:$LINENO: checking for joinable pthread attribute" >&5
$as_echo_n "checking for joinable pthread attribute... " >&6; }
        cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
#include <pthread.h>
int
main ()
{
int attr=PTHREAD_CREATE_JOINABLE;
  ;
  return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_link") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } && {
	 test -z "$ac_c_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest$ac_exeext && {
	 test "$cross_compiling" = yes ||
	 $as_test_x conftest$ac_exeext
       }; then
  ok=PTHREAD_CREATE_JOINABLE
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

	ok=unknown
fi

rm -rf conftest.dSYM
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
      conftest$ac_exeext conftest.$ac_ext
        if test x"$ok" = xunknown; then
                cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
#include <pthread.h>
int
main ()
{
int attr=PTHREAD_CREATE_UNDETACHED;
  ;
  return 0;
}
_ACEOF
rm -f conftest.$ac_objext conftest$ac_exeext
if { (ac_try="$ac_link"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_link") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } && {
	 test -z "$ac_c_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest$ac_exeext && {
	 test "$cross_compiling" = yes ||
	 $as_test_x conftest$ac_exeext
       }; then
  ok=PTHREAD_CREATE_UNDETACHED
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

	ok=unknown
fi

rm -rf conftest.dSYM
rm -f core conftest.err conftest.$ac_objext conftest_ipa8_conftest.oo \
      conftest$ac_exeext conftest.$ac_ext
        fi
        if test x"$ok" != xPTHREAD_CREATE_JOINABLE; then

cat >>confdefs.h <<\_ACEOF
#define PTHREAD_CREATE_JOINABLE $ok
_ACEOF

        fi
        { $as_echo "$as_me:$LINENO: result: ${ok}" >&5
$as_echo "${ok}" >&6; }
        if test x"$ok" = xunknown; then
                { $as_echo "$as_me:$LINENO: WARNING: we do not know how to create joinable pthreads" >&5
$as_echo "$as_me: WARNING: we do not know how to create joinable pthreads" >&2;}
        fi

        { $as_echo "$as_me:$LINENO: checking if more special flags are required for pthreads" >&5
$as_echo_n "checking if more special flags are required for pthreads... " >&6; }
        flag=no
        case "${host_cpu}-${host_os}" in
                *-aix* | *-freebsd*)     flag="-D_THREAD_SAFE";;
                *solaris* | alpha*-osf*) flag="-D_REENTRANT";;
        esac
        { $as_echo "$as_me:$LINENO: result: ${flag}" >&5
$as_echo "${flag}" >&6; }
        if test "x$flag" != xno; then
                PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
        fi

        LIBS="$save_LIBS"
        CFLAGS="$save_CFLAGS"

        # More AIX lossage: must compile with cc_r
        # Extract the first word of "cc_r", so it can be a program name with args.
set dummy cc_r; ac_word=$2
{ $as_echo "$as_me:$LINENO: checking for $ac_word" >&5
$as_echo_n "checking for $ac_word... " >&6; }
if test "${ac_cv_prog_PTHREAD_CC+set}" = set; then
  $as_echo_n "(cached) " >&6
else
  if test -n "$PTHREAD_CC"; then
  ac_cv_prog_PTHREAD_CC="$PTHREAD_CC" # Let the user override the test.
else
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH
do
  IFS=$as_save_IFS
  test -z "$as_dir" && as_dir=.
  for ac_exec_ext in '' $ac_executable_extensions; do
  if { test -f "$as_dir/$ac_word$ac_exec_ext" && $as_test_x "$as_dir/$ac_word$ac_exec_ext"; }; then
    ac_cv_prog_PTHREAD_CC="cc_r"
    $as_echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
    break 2
  fi
done
done
IFS=$as_save_IFS

  test -z "$ac_cv_prog_PTHREAD_CC" && ac_cv_prog_PTHREAD_CC="${CC}"
fi
fi
PTHREAD_CC=$ac_cv_prog_PTHREAD_CC
if test -n "$PTHREAD_CC"; then
  { $as_echo "$as_me:$LINENO: result: $PTHREAD_CC" >&5
$as_echo "$PTHREAD_CC" >&6; }
else
  { $as_echo "$as_me:$LINENO: result: no" >&5
$as_echo "no" >&6; }
fi


else
        PTHREAD_CC="$CC"
fi





# Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
if test x"$acx_pthread_ok" = xyes; then

cat >>confdefs.h <<\_ACEOF
#define HAVE_PTHREAD 1
_ACEOF

        :
else
        acx_pthread_ok=no

fi


  CC="$PTHREAD_CC"
  AM_CFLAGS="$AM_CFLAGS $PTHREAD_CFLAGS -D_REENTRANT"
  LIBS="$PTHREAD_LIBS $LIBS"
fi
 if test $use_pthreads = "yes"; then
  USE_THREADS_TRUE=
  USE_THREADS_FALSE='#'
else
  USE_THREADS_TRUE='#'
  USE_THREADS_FALSE=
fi


################ handle the FFTW library (Fourier transforms) ################




acx_fftw_ok=no
if test x$fftw_incdir = x; then
  if test x$fftw_libdir = x; then
    if test "${ac_cv_header_fftw3_h+set}" = set; then
  { $as_echo "$as_me:$LINENO: checking for fftw3.h" >&5
$as_echo_n "checking for fftw3.h... " >&6; }
if test "${ac_cv_header_fftw3_h+set}" = set; then
  $as_echo_n "(cached) " >&6
fi
{ $as_echo "$as_me:$LINENO: result: $ac_cv_header_fftw3_h" >&5
$as_echo "$ac_cv_header_fftw3_h" >&6; }
else
  # Is the header compilable?
{ $as_echo "$as_me:$LINENO: checking fftw3.h usability" >&5
$as_echo_n "checking fftw3.h usability... " >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
$ac_includes_default
#include <fftw3.h>
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_compile") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } && {
	 test -z "$ac_c_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest.$ac_objext; then
  ac_header_compiler=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

	ac_header_compiler=no
fi

rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
{ $as_echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
$as_echo "$ac_header_compiler" >&6; }

# Is the header present?
{ $as_echo "$as_me:$LINENO: checking fftw3.h presence" >&5
$as_echo_n "checking fftw3.h presence... " >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
#include <fftw3.h>
_ACEOF
if { (ac_try="$ac_cpp conftest.$ac_ext"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } >/dev/null && {
	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
	 test ! -s conftest.err
       }; then
  ac_header_preproc=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

  ac_header_preproc=no
fi

rm -f conftest.err conftest.$ac_ext
{ $as_echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
$as_echo "$ac_header_preproc" >&6; }

# So?  What about this header?
case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
  yes:no: )
    { $as_echo "$as_me:$LINENO: WARNING: fftw3.h: accepted by the compiler, rejected by the preprocessor!" >&5
$as_echo "$as_me: WARNING: fftw3.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw3.h: proceeding with the compiler's result" >&5
$as_echo "$as_me: WARNING: fftw3.h: proceeding with the compiler's result" >&2;}
    ac_header_preproc=yes
    ;;
  no:yes:* )
    { $as_echo "$as_me:$LINENO: WARNING: fftw3.h: present but cannot be compiled" >&5
$as_echo "$as_me: WARNING: fftw3.h: present but cannot be compiled" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw3.h:     check for missing prerequisite headers?" >&5
$as_echo "$as_me: WARNING: fftw3.h:     check for missing prerequisite headers?" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw3.h: see the Autoconf documentation" >&5
$as_echo "$as_me: WARNING: fftw3.h: see the Autoconf documentation" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw3.h:     section \"Present But Cannot Be Compiled\"" >&5
$as_echo "$as_me: WARNING: fftw3.h:     section \"Present But Cannot Be Compiled\"" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw3.h: proceeding with the preprocessor's result" >&5
$as_echo "$as_me: WARNING: fftw3.h: proceeding with the preprocessor's result" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw3.h: in the future, the compiler will take precedence" >&5
$as_echo "$as_me: WARNING: fftw3.h: in the future, the compiler will take precedence" >&2;}
    ( cat <<\_ASBOX
## ---------------------------- ##
## Report this to bertin@iap.fr ##
## ---------------------------- ##
_ASBOX
     ) | sed "s/^/$as_me: WARNING:     /" >&2
    ;;
esac
{ $as_echo "$as_me:$LINENO: checking for fftw3.h" >&5
$as_echo_n "checking for fftw3.h... " >&6; }
if test "${ac_cv_header_fftw3_h+set}" = set; then
  $as_echo_n "(cached) " >&6
else
  ac_cv_header_fftw3_h=$ac_header_preproc
fi
{ $as_echo "$as_me:$LINENO: result: $ac_cv_header_fftw3_h" >&5
$as_echo "$ac_cv_header_fftw3_h" >&6; }

fi
if test "x$ac_cv_header_fftw3_h" = x""yes; then
  acx_fftw_ok=yes
fi


    if test x$acx_fftw_ok = xyes; then

cat >>confdefs.h <<\_ACEOF
#define FFTW_H "fftw.h"
_ACEOF

    else
      if test "${ac_cv_header_fftw_fftw3_h+set}" = set; then
  { $as_echo "$as_me:$LINENO: checking for fftw/fftw3.h" >&5
$as_echo_n "checking for fftw/fftw3.h... " >&6; }
if test "${ac_cv_header_fftw_fftw3_h+set}" = set; then
  $as_echo_n "(cached) " >&6
fi
{ $as_echo "$as_me:$LINENO: result: $ac_cv_header_fftw_fftw3_h" >&5
$as_echo "$ac_cv_header_fftw_fftw3_h" >&6; }
else
  # Is the header compilable?
{ $as_echo "$as_me:$LINENO: checking fftw/fftw3.h usability" >&5
$as_echo_n "checking fftw/fftw3.h usability... " >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
$ac_includes_default
#include <fftw/fftw3.h>
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_compile") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } && {
	 test -z "$ac_c_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest.$ac_objext; then
  ac_header_compiler=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

	ac_header_compiler=no
fi

rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
{ $as_echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
$as_echo "$ac_header_compiler" >&6; }

# Is the header present?
{ $as_echo "$as_me:$LINENO: checking fftw/fftw3.h presence" >&5
$as_echo_n "checking fftw/fftw3.h presence... " >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
#include <fftw/fftw3.h>
_ACEOF
if { (ac_try="$ac_cpp conftest.$ac_ext"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } >/dev/null && {
	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
	 test ! -s conftest.err
       }; then
  ac_header_preproc=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

  ac_header_preproc=no
fi

rm -f conftest.err conftest.$ac_ext
{ $as_echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
$as_echo "$ac_header_preproc" >&6; }

# So?  What about this header?
case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
  yes:no: )
    { $as_echo "$as_me:$LINENO: WARNING: fftw/fftw3.h: accepted by the compiler, rejected by the preprocessor!" >&5
$as_echo "$as_me: WARNING: fftw/fftw3.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw/fftw3.h: proceeding with the compiler's result" >&5
$as_echo "$as_me: WARNING: fftw/fftw3.h: proceeding with the compiler's result" >&2;}
    ac_header_preproc=yes
    ;;
  no:yes:* )
    { $as_echo "$as_me:$LINENO: WARNING: fftw/fftw3.h: present but cannot be compiled" >&5
$as_echo "$as_me: WARNING: fftw/fftw3.h: present but cannot be compiled" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw/fftw3.h:     check for missing prerequisite headers?" >&5
$as_echo "$as_me: WARNING: fftw/fftw3.h:     check for missing prerequisite headers?" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw/fftw3.h: see the Autoconf documentation" >&5
$as_echo "$as_me: WARNING: fftw/fftw3.h: see the Autoconf documentation" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw/fftw3.h:     section \"Present But Cannot Be Compiled\"" >&5
$as_echo "$as_me: WARNING: fftw/fftw3.h:     section \"Present But Cannot Be Compiled\"" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw/fftw3.h: proceeding with the preprocessor's result" >&5
$as_echo "$as_me: WARNING: fftw/fftw3.h: proceeding with the preprocessor's result" >&2;}
    { $as_echo "$as_me:$LINENO: WARNING: fftw/fftw3.h: in the future, the compiler will take precedence" >&5
$as_echo "$as_me: WARNING: fftw/fftw3.h: in the future, the compiler will take precedence" >&2;}
    ( cat <<\_ASBOX
## ---------------------------- ##
## Report this to bertin@iap.fr ##
## ---------------------------- ##
_ASBOX
     ) | sed "s/^/$as_me: WARNING:     /" >&2
    ;;
esac
{ $as_echo "$as_me:$LINENO: checking for fftw/fftw3.h" >&5
$as_echo_n "checking for fftw/fftw3.h... " >&6; }
if test "${ac_cv_header_fftw_fftw3_h+set}" = set; then
  $as_echo_n "(cached) " >&6
else
  ac_cv_header_fftw_fftw3_h=$ac_header_preproc
fi
{ $as_echo "$as_me:$LINENO: result: $ac_cv_header_fftw_fftw3_h" >&5
$as_echo "$ac_cv_header_fftw_fftw3_h" >&6; }

fi
if test "x$ac_cv_header_fftw_fftw3_h" = x""yes; then
  acx_fftw_ok=yes
fi


      if test x$acx_fftw_ok = xyes; then

cat >>confdefs.h <<\_ACEOF
#define FFTW_H "fftw/fftw3.h"
_ACEOF

      else
        FFTW_ERROR="FFTW include files not found in default location!"
      fi
    fi
  else
    as_ac_Header=`$as_echo "ac_cv_header_$fftw_libdir/include/fftw3.h" | $as_tr_sh`
if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
  { $as_echo "$as_me:$LINENO: checking for $fftw_libdir/include/fftw3.h" >&5
$as_echo_n "checking for $fftw_libdir/include/fftw3.h... " >&6; }
if { as_var=$as_ac_Header; eval "test \"\${$as_var+set}\" = set"; }; then
  $as_echo_n "(cached) " >&6
fi
ac_res=`eval 'as_val=${'$as_ac_Header'}
		 $as_echo "$as_val"'`
	       { $as_echo "$as_me:$LINENO: result: $ac_res" >&5
$as_echo "$ac_res" >&6; }
else
  # Is the header compilable?
{ $as_echo "$as_me:$LINENO: checking $fftw_libdir/include/fftw3.h usability" >&5
$as_echo_n "checking $fftw_libdir/include/fftw3.h usability... " >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
$ac_includes_default
#include <$fftw_libdir/include/fftw3.h>
_ACEOF
rm -f conftest.$ac_objext
if { (ac_try="$ac_compile"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_compile") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } && {
	 test -z "$ac_c_werror_flag" ||
	 test ! -s conftest.err
       } && test -s conftest.$ac_objext; then
  ac_header_compiler=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

	ac_header_compiler=no
fi

rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
{ $as_echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
$as_echo "$ac_header_compiler" >&6; }

# Is the header present?
{ $as_echo "$as_me:$LINENO: checking $fftw_libdir/include/fftw3.h presence" >&5
$as_echo_n "checking $fftw_libdir/include/fftw3.h presence... " >&6; }
cat >conftest.$ac_ext <<_ACEOF
/* confdefs.h.  */
_ACEOF
cat confdefs.h >>conftest.$ac_ext
cat >>conftest.$ac_ext <<_ACEOF
/* end confdefs.h.  */
#include <$fftw_libdir/include/fftw3.h>
_ACEOF
if { (ac_try="$ac_cpp conftest.$ac_ext"
case "(($ac_try" in
  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
  *) ac_try_echo=$ac_try;;
esac
eval ac_try_echo="\"\$as_me:$LINENO: $ac_try_echo\""
$as_echo "$ac_try_echo") >&5
  (eval "$ac_cpp conftest.$ac_ext") 2>conftest.er1
  ac_status=$?
  grep -v '^ *+' conftest.er1 >conftest.err
  rm -f conftest.er1
  cat conftest.err >&5
  $as_echo "$as_me:$LINENO: \$? = $ac_status" >&5
  (exit $ac_status); } >/dev/null && {
	 test -z "$ac_c_preproc_warn_flag$ac_c_werror_flag" ||
	 test ! -s conftest.err
       }; then
  ac_header_preproc=yes
else
  $as_echo "$as_me: failed program was:" >&5
sed 's/^/| /' conftest.$ac_ext >&5

  ac_header_preproc=no
fi

rm -f conftest.err conftest.$ac_ext
{ $as_echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
$as_echo "$ac_header_preproc" >&6; }

# So?  What about this header?