AC_INIT(ESPRESSO, 2.1, , espresso)

# -----------------------------
# application-specific settings

# default choices
# set each variable to 0 (false) or 1 (true)
use_parallel=1
use_shared=1

# -----------------------------

# store variables from the environment (may be set or not)
topdir=$TOPDIR
arch=$ARCH
cc=$CC
cpp=$CPP
cflags=$CFLAGS
cppflags=$CPPFLAGS
dflags=$DFLAGS
f77=$F77
f90=$F90
fflags=$FFLAGS
f90flags=$F90FLAGS
ld=$LD
ldflags=$LDFLAGS
blas_libs=$BLAS_LIBS
lapack_libs=$LAPACK_LIBS
fft_libs=$FFT_LIBS
mpi_libs=$MPI_LIBS
mass_libs=$MASS_LIBS
libdirs=$LIBDIRS
ar=$AR
arflags=$ARFLAGS
mylib=$MYLIB
includefftw=$INCLUDEFFTW

# command-line arguments
for arg in $*
do
	if   test "$arg" = "--enable-parallel"  ; then use_parallel=1
	elif test "$arg" = "--disable-parallel" ; then use_parallel=0
	elif test "$arg" = "--enable-shared"    ; then use_shared=1
	elif test "$arg" = "--disable-shared"   ; then use_shared=0
	fi
done

# configure for current directory by default
if test "$topdir" = "" ; then topdir="`pwd`" ; fi

# check system type (no cross-compilation for now)
AC_CANONICAL_BUILD

# many HPC systems are configured so that running parallel programs
# interactively is disabled: on those systems, AC_PROG_F77 and AC_PROG_CC
# would fail because they can't run the compiled executables
# to work around that, let's pretend we are cross-compiling even if we aren't
# !!! this relies on undocumented Autoconf behavior !!! 
if test "$host" = "" ; then host=$build ; fi
cross_compiling=yes

# identify architecture
if test "$arch" = ""
then
	case $host in
		ia64-*-linux-gnu | x86_64-*-linux-gnu ) arch=linux64 ;;
		*-pc-linux-gnu )                        arch=linux32 ;;
		*-ibm-aix* )                            arch=aix     ;;
		mips-sgi-* )                            arch=mips    ;;
		alphaev*-dec-osf* )                     arch=alpha   ;;
		alphaev*-*-linux* )                     arch=alinux  ;;
		sparc-sun-* )                           arch=sparc   ;;
		*cray-unicosmp* )                       arch=crayx1  ;;
		powerpc-apple-darwin* )                 arch=mac     ;;
	esac
fi
echo checking architecture... $arch

# check compiling environment
case $arch in
linux64 )
	try_f90_parallel="mpif90"
	try_f90="ifort ifc efc pgf90 g95 f90"
	try_ar="ar"
	try_arflags="ruv"
	try_dflags="-D__LINUX64"
	;;
linux32 )
	try_f90_parallel="mpif90"
	try_f90="ifort ifc pgf90 g95 f90"
	try_ar="ar"
	try_arflags="ruv"
	try_dflags="-D__LINUX"
	;;
aix )
	try_f90_parallel="mpxlf90_r mpxlf90"
	try_f90="xlf90_r xlf90 f90"
	try_ar="ar"
	try_arflags="-X64 ruv"
	try_dflags="-D__AIX -D__XLF"
	;;
mips )
	try_f90="f90"
	try_ar="ar"
	try_arflags="ruv"
	try_dflags="-D__SGI -D__SGI64 -D__ORIGIN"
	;;
alpha )
	try_f90="f90"
	try_ar="ar"
	try_arflags="ruv"
	try_dflags="-D__ALPHA"
	;;
alinux )
	try_f90_parallel="mpif90"
	try_f90="fort g95 f90"
	try_ar="ar"
	try_arflags="ruv"
	try_dflags="-D__ALPHA -D__LINUX64"
	;;
sparc )
	try_f90_parallel="mpf90"
	try_f90="f90"
	try_ar="ar"
	try_arflags="ruv"
	try_dflags="-D__SUN"
	;;
crayx1 )
	try_f90="ftn"
	try_ar="ar"
	try_arflags="ruv"
	try_dflags="-D__X1"
	;;
mac )
	try_f90_parallel="mpxlf90 mpf90"
	try_f90="xlf90 f90"
	try_ar="ar"
	try_arflags="ruv"
	try_dflags="-D__MAC -D__XLF"
	ranlib="ranlib"
	;;
* )
	AC_MSG_WARN(unsupported architecture)
	try_f90="f90"
	try_ar="ar"
	try_arflags="ruv"
	;;
esac
if test "$use_parallel" -ne 0 ; then try_f90="$try_f90_parallel $try_f90" ; fi

# check Fortran 90 compiler
if test "$f90" = "" ; then f90="$try_f90" ; fi
unset F77 # otherwise it may interfere with the check
AC_PROG_F77($f90)
f90=$F77
f90_id=$f90 # this should be the compiler's brand name

case "$arch:$f90" in
linux* )
	# double-check compiler
	# because on GNU/Linux systems they often have nonstandard names
	echo $ECHO_N "checking version of $f90... $ECHO_C"
	ifort_version=`$f90 -V 2>&1 | grep "Intel(R)"`
	pgf_version=`$f90 -V 2>&1 | grep "^pgf"`
	g95_version=`$f90 -v 2>&1 | grep "g95"`
	if test "$ifort_version" != ""
	then
		version=`$f90 -V 2>&1 | grep Version |
			 sed 's/.*Version//' | awk '{print $1}'`
		if test `echo $version | sed 's/\..*//'` -lt 8
		then
			f90_id=ifc
		else
			f90_id=ifort
		fi
		echo "${ECHO_T}$f90_id $version"

		try_cc="icc ecc gcc cc"
		try_f77="ifort ifc efc $f90"
	elif test "$pgf_version" != ""
	then
		f90_id=`echo $pgf_version | awk '{print $1}'`
		version=`echo $pgf_version | awk '{print $2}'`
		echo "${ECHO_T}$f90_id $version"

		try_cc="pgcc gcc cc"
		try_f77="pgf77 $f90"
	elif test "$g95_version" != ""
	then
		f90_id=g95
		version=`echo $g95_version | awk '{print $3}'`
		echo "${ECHO_T}g95 $version"

		try_cc="gcc cc"
		try_f77="$f90"
	else
		echo "${ECHO_T}unknown"
		try_cc="gcc cc"
		try_f77="f77 $f90"
	fi
	;;
aix:*xlf*_r )
	try_cc="xlc_r cc gcc"
	try_f77="xlf_r f77 $f90"
	;;
aix:*xlf* )
	try_cc="xlc cc gcc"
	try_f77="xlf f77 $f90"
	;;
mips:* )
	try_cc="cc gcc"
	try_f77="f77 $f90"
	;;
alpha:* )
	try_cc="cc gcc"
	try_f77="f77 $f90"
	;;
alinux:* )
	try_cc="ccc gcc"
	try_f77="fort g77 f77 $f90"
	;;
sparc:* )
	try_cc="cc gcc"
	try_f77="f77 $f90"
	;;
crayx1:ftn )
	try_cc="cc"
	try_f77="$f90"
	;;
mac:xlf90 )
	try_cc="gcc"
	try_f77="xlf f77 $f90"
	;;
mac:* )
	try_cc="gcc"
	try_f77="f77 $f90"
	;;
* )
	# unknown, try these
	try_cc="cc gcc"
	try_f77="f77 $f90"
	;;
esac

case "$arch:$f90" in
*:mpif90 )
	try_cc_parallel="mpicc"
	try_f77_parallel="mpif77"
	;;
*:mpf90 )
	try_cc_parallel="mpcc"
	try_f77_parallel="mpf77"
	;;
aix:mpxlf*_r )
	try_cc_parallel="mpcc_r"
	try_f77_parallel="mpxlf_r"
	;;
aix:mpxlf* )
	try_cc_parallel="mpcc"
	try_f77_parallel="mpxlf"
	;;
mac:mpxlf* )
	try_cc_parallel="mpcc"
	try_f77_parallel="mpxlf mpf77"
	;;
esac
if test "$use_parallel" -ne 0
then
	try_f77="$try_f77_parallel $try_f77"
	try_cc="$try_cc_parallel $try_cc"
fi

# clear cached values
unset F77 ac_cv_prog_ac_ct_F77 ac_cv_f77_compiler_gnu ac_cv_prog_f77_g

# Fortran 77 compiler
if test "$f77" = "" ; then f77="$try_f77" ; fi
AC_PROG_F77($f77)
f77=$F77

# C compiler
if test "$cc" = "" ; then cc="$try_cc" ; fi
AC_PROG_CC($cc)
cc=$CC
cc_id=$cc # this should be the compiler's brand name

case "$arch:$cc" in
linux* )
	# double-check compiler
	# because on GNU/Linux systems they often have nonstandard names
	echo $ECHO_N "checking version of $cc... $ECHO_C"
	icc_version=`$cc -V 2>&1 | grep "Intel(R)"`
	pgcc_version=`$cc -V 2>&1 | grep "^pgcc"`
	gcc_version=`$cc -v 2>&1 | grep "gcc version"`
	if test "$icc_version" != ""
	then
		cc_id=icc
		cversion=`$cc -V 2>&1 | grep Version |
			  sed 's/.*Version//' | awk '{print $1}'`
		echo "${ECHO_T}icc $cversion"
	elif test "$pgcc_version" != ""
	then
		cc_id=`echo $pgcc_version | awk '{print $1}'`
		cversion=`echo $pgcc_version | awk '{print $2}'`
		echo "${ECHO_T}$cc_id $cversion"
	elif test "$gcc_version" != ""
	then
		cc_id=gcc
		cversion=`echo $gcc_version | awk '{print $3}'`
		echo "${ECHO_T}gcc $cversion"
	else
		echo "${ECHO_T}unknown"
	fi
	;;
esac

# check whether the C and Fortran compilers are compatible
case "$arch:$cc_id:$f90_id" in
	# list supported combinations here
linux*:icc:ifort | linux*:icc:ifc ) ;;
linux*:gcc:ifort | linux*:gcc:ifc ) ;;
linux*:pgcc:pgf90 )                 ;;
linux*:gcc:g95 )                    ;;
aix:mpcc*:mpxlf* )                  ;;
aix:xlc*:*xlf* | aix:cc:*xlf* )     ;;
mips:cc:f90 )                       ;;
alinux:ccc:fort | alinux:gcc:fort ) ;;
alpha:cc:f90 )                      ;;
mac:mpcc:mpf90 )                    ;;
mac:gcc:xlf90 )                     ;;
crayx1:cc:ftn )                     ;;
sparc:cc:f90 )                      ;;

* )
	AC_MSG_WARN(unsupported C/Fortran compilers combination)
	;;
esac

# check Fortran compiler flags
have_cpp=0
xlf_flags=0

case "$arch:$f90_id" in
linux64:ifort )
	try_fflags="-O2 -assume byterecl"
	try_f90flags="\$(FFLAGS) -nomodule"
	try_fflags_noopt="-O0 -assume byterecl"
	try_f90flags_noopt="\$(FFLAGS_NOOPT) -nomodule"
	try_ldflags=""
	try_ldflags_static="-static"
	try_dflags="$try_dflags -D__INTEL"
	pre_fdflags="-fpp "
	have_cpp=1
	;;
linux64:ifc )
	try_fflags="-Vaxlib -O2"
	try_f90flags="\$(FFLAGS) -nomodule"
	try_fflags_noopt="-O0"
	try_f90flags_noopt="\$(FFLAGS_NOOPT) -nomodule"
	try_ldflags="-Vaxlib"
	try_ldflags_static="-static"
	try_dflags="$try_dflags -D__INTEL"
	pre_fdflags="-fpp "
	have_cpp=1
	;;
linux64:pgf* )
	try_fflags="-fast -r8"
	try_f90flags="\$(FFLAGS)"
	try_fflags_noopt="-O0"
	try_f90flags_noopt="\$(FFLAGS_NOOPT)"
	try_ldflags=""
	try_ldflags_static="-Bstatic"
	try_dflags="$try_dflags -D__PGI"
	;;
linux32:ifort )
        try_fflags="-O2 -tpp6 -assume byterecl"
	try_f90flags="\$(FFLAGS) -nomodule"
	try_fflags_noopt="-O0 -assume byterecl"
	try_f90flags_noopt="\$(FFLAGS_NOOPT) -nomodule"
	try_ldflags=""
	try_ldflags_static="-static"
	try_dflags="$try_dflags -D__INTEL"
	pre_fdflags="-fpp "
	have_cpp=1
	;;
linux32:ifc )
        try_fflags="-Vaxlib -O2 -tpp6"
	try_f90flags="\$(FFLAGS) -nomodule"
	try_fflags_noopt="-O0"
	try_f90flags_noopt="\$(FFLAGS_NOOPT) -nomodule"
	try_ldflags="-Vaxlib"
	try_ldflags_static="-static"
	try_dflags="$try_dflags -D__INTEL"
	pre_fdflags="-fpp "
	have_cpp=1

	if test `echo $version | sed 's/\..*//'` -lt 7
	then
		# old versions of ifc require this stuff
		echo $ECHO_N "setting up ifc environment... $ECHO_C"
		try_f90flags="\$(FFLAGS) -cl,./intel.pcl"
		try_f90flags_noopt="\$(FFLAGS_NOOPT) -cl,./intel.pcl"
		pcl_ph="D3 Raman"
		pcl_pw="PH PP Gamma PWCOND pwtools $pcl_ph"
		pcl_modules="PW CPV flib upftools atomic $pcl_pw"
		pcl_dot=". Modules $pcl_modules"
		for dir in $pcl_dot
		do
			echo work.pc > $topdir/$dir/intel.pcl
		done
		for dir in $pcl_modules
		do
			echo ../Modules/work.pc >> $topdir/$dir/intel.pcl
		done
		for dir in $pcl_pw
		do
			echo ../PW/work.pc >> $topdir/$dir/intel.pcl
		done
		for dir in $pcl_ph
		do
			echo ../PH/work.pc >> $topdir/$dir/intel.pcl
		done
		echo "${ECHO_T}done"
	fi
	;;
linux32:pgf* )
	try_fflags="-fast -r8"
	try_f90flags="\$(FFLAGS)"
	try_fflags_noopt="-O0"
	try_f90flags_noopt="\$(FFLAGS_NOOPT)"
	try_ldflags=""
	try_ldflags_static="-Bstatic"
	try_dflags="$try_dflags -D__PGI"
	;;
linux*:g95 )
	try_fflags="-O3"
	try_f90flags="\$(FFLAGS)"
	try_fflags_noopt="-O0"
	try_f90flags_noopt="\$(FFLAGS_NOOPT)"
	try_ldflags=""
	#try_ldflags_static="-static"
	try_dflags="$try_dflags -D__G95"
	;;
aix:*xlf* )
	try_fflags="-q64 -qalias=noaryovrlp -O3 -qstrict \
-qarch=auto -qtune=auto -qdpc -Q -qalias=nointptr"
	try_f90flags="\$(FFLAGS) -qsuffix=cpp=f90 -qfree=f90"
	try_fflags_noopt="-q64 -O0"
	try_f90flags_noopt="\$(FFLAGS_NOOPT) -qsuffix=cpp=f90 -qfree=f90"
	try_ldflags="-q64"
	# try_ldflags_static="-bstatic"
	pre_fdflags="-WF,"
	xlf_flags=1
	have_cpp=1
	;;
mips:f90 )
	try_fflags="-mips4 -64 -O2 -r10000 -r8"
	try_f90flags="\$(FFLAGS)"
	try_fflags_noopt="-mips4 -64 -O0"
	try_f90flags_noopt="\$(FFLAGS_NOOPT)"
	try_ldflags="-mips4 -64"
	pre_fdflags="-cpp "
	have_cpp=1
	;;
alinux:fort )
	have_cpp=1
	pre_fdflags="-cpp "
	try_fflags="-O -r8 -align dcommons -align records"
	try_f90flags="\$(FFLAGS) -free"
	try_fflags_noopt="-O0 -r8 -align dcommons -align records"
	try_f90flags_noopt="\$(FFLAGS_NOOPT) -free"
        try_ldflags_static="-non_shared"
	;;
alpha:f90 )
	have_cpp=1
	pre_fdflags="-cpp "
	try_fflags="-O -real_size 64 -align dcommons -align records"
	try_f90flags="\$(FFLAGS) -free"
	try_fflags_noopt="-O0 -real_size 64 -align dcommons -align records"
	try_f90flags_noopt="\$(FFLAGS_NOOPT) -free"
	;;
sparc:mpf90 | sparc:f90 )
	try_fflags="-fast -O1 -nodepend -xvector=no -xchip=ultra3 \
-xarch=v8plusb -xlic_lib=sunperf"
	try_f90flags="\$(FFLAGS)"
	try_fflags_noopt="-O0 -xlic_lib=sunperf"
	try_f90flags_noopt="\$(FFLAGS_NOOPT)"
	try_ldflags=""
	imod="-M"
	;;
crayx1:ftn )
        try_fflags="-s default64 -dp -rma -e0 \
-O scalar3,stream3,vector3,nointerchange -Z -O inline5"
        try_f90flags="\$(FFLAGS)"
        try_fflags_noopt="-s default64 -dp -rma -e0 -O0 -Z"
        try_f90flags_noopt="\$(FFLAGS_NOOPT)"
        try_ldflags="-s default64 -f nan64"
        try_dflags="$try_dflags -D__X1_COA"
        pre_fdflags="-e Z -F"
        have_cpp=1
	;;
mac:* )
	try_fflags="-O4 -qarch=auto -qtune=auto -qsuffix=cpp=f90 \
-qdpc -qalias=nointptr"
	try_f90flags="\$(FFLAGS) -qfree=f90"
	try_fflags_noopt="-O0"
	try_f90flags_noopt="\$(FFLAGS_NOOPT) -qfree=f90"
	try_ldflags=""
	pre_fdflags="-WF,"
	xlf_flags=1
	have_cpp=1
	;;
* )
	# unknown, try these
	try_fflags="-O"
	try_f90flags="\$(FFLAGS)"
	try_fflags_noopt="-O0"
	try_f90flags_noopt="$\(FFLAGS_NOOPT)"
	try_ldflags=""
	;;
esac
if test "$use_shared" -eq 0 ; then
try_ldflags="$try_ldflags $try_ldflags_static" ; fi

if test "$fflags" = ""   ; then fflags=$try_fflags     ; fi
if test "$f90flags" = "" ; then f90flags=$try_f90flags ; fi
if test "$fflags_noopt" = ""   ; then fflags_noopt=$try_fflags_noopt     ; fi
if test "$f90flags_noopt" = "" ; then f90flags_noopt=$try_f90flags_noopt ; fi
echo setting FFLAGS... $fflags
echo setting F90FLAGS... $f90flags
echo setting FFLAGS_NOOPT... $fflags_noopt
echo setting F90FLAGS_NOOPT... $f90flags_noopt
if test "$imod" = "" ; then imod="-I" ; fi

case "$arch:$cc_id" in
linux*:icc )
	try_cflags="-O3"
	c_ldflags=""
	;;
linux*:pgcc )
	try_cflags="-fast"
	c_ldflags=""
	try_cpp="cpp"
	;;
linux*:gcc )
	try_cflags="-O3 -fomit-frame-pointer"
	c_ldflags=""
	try_cpp="cpp"
	;;
aix:mpcc* | aix:xlc* | aix:cc )
	try_cflags="-q64 -O2"
	c_ldflags="-q64"
	;;
mips:cc )
	try_cflags="-mips4 -64 -O2 -r10000"
	;;
alpha:cc )
	try_cflags="-O"
	;;
sparc:mpcc | sparc:cc )
	try_cflags="-fast -dalign -xchip=ultra3 -xarch=v8plusb \
-xlic_lib=sunperf"
	try_cpp="fpp"
	;;
crayx1:cc )
        try_cflags=""
        c_ldflags=""
        ;;
mac:gcc )
	try_cflags="-O3 -fomit-frame-pointer -I/usr/include/malloc"
	try_cpp="cpp"
	;;
mac:* )
	try_cflags="-O4"
	;;
*:gcc )
	try_cflags="-O3 -fomit-frame-pointer"
	try_cpp="cpp"
	;;
* )
	try_cflags="-O"
	;;
esac
if test "$cflags" = "" ; then cflags=$try_cflags ; fi
echo setting CFLAGS... $cflags

# preprocessor
AC_PROG_CPP
if test "$cpp" = "" ; then cpp=$try_cpp; fi
if test "$cpp" = "" ; then cpp=$CPP;     fi
echo setting CPP... $cpp

echo $ECHO_N "setting CPPFLAGS... $ECHO_C"
case $cpp in
	cpp) try_cppflags="-P -traditional" ;;
	fpp) try_cppflags="-P"              ;;
	*)   try_cppflags=""                ;;
esac
if test "$cppflags" = "" ; then cppflags=$try_cppflags ; fi
echo "${ECHO_T}$cppflags"

# linker and archiver (no tests)
if test "$ld" = ""       ; then ld="$f90"              ; fi
if test "$ldflags" = ""  ; then ldflags="$try_ldflags" ; fi
if test "$ar" = ""       ; then ar="$try_ar"           ; fi
if test "$arflags" = ""  ; then arflags="$try_arflags" ; fi
echo setting LD... $ld
echo setting LDFLAGS... $ldflags
echo setting AR... $ar
echo setting ARFLAGS... $arflags

# compilation rules
AC_PROG_MAKE_SET
echo $ECHO_N "checking whether Fortran files must be preprocessed... $ECHO_C"
if test "$have_cpp" -ne 0
then
	f90rule="\$(F90) \$(F90FLAGS) -c \$<"
	echo "${ECHO_T}no"
else
	f90rule="\$(CPP) \$(CPPFLAGS) \$< -o \$*.F90 \\
	\$(F90) \$(F90FLAGS) -c \$*.F90 -o \$*.o"
	echo "${ECHO_T}yes"
fi

# compilation flags for all subsequent tests
# remove all $(...) because at least one compiler doesn't like them
# but if f90flags contains $(FFLAGS), substitute it
test_cflags="`echo $cflags | sed 's/\$([[^)]]*)//g'`"
test_cppflags="$test_cflags"
if test "`echo $f90flags | grep '$(FFLAGS)'`" != ""
then
	test_fflags="`echo $fflags $f90flags | sed 's/\$([[^)]]*)//g'`"
else
	test_fflags="`echo $f90flags | sed 's/\$([[^)]]*)//g'`"
fi
test_ldflags="`echo $ldflags | sed 's/\$([[^)]]*)//g'`"

AC_LANG_PUSH(Fortran 77)
F77=$f90 # use Fortran 90 actually (autoconf only knows Fortran 77!)

# search for libraries
have_blas=0
have_lapack=0
have_essl=0
have_fft=0
have_fftw=0
have_fftw_h=0
have_mpi=0

# check for blas
# supported vendor replacements:
#   mkl on linux
#   essl on aix
#   complib.sgimath on mips
#   cxml on alpha
#   SUNperf on sparc
# atlas is used over blas if available
# internal version is used if none is found
if test "$blas_libs" = ""
then
	# check directories in LD_LIBRARY_PATH too
	# (maybe they are already searched by default, but I'm not sure)
	ld_library_path=`echo $LD_LIBRARY_PATH | sed 's/:/ /g'`

	# build list of directories to search
	case "$arch" in
	mac )    try_libdirs="/usr/local/lib /sw/lib" ;;
	*)       try_libdirs="/usr/local/lib"         ;;
	esac

	# search
	case "$arch:$f90_id" in

	linux64:ifort | linux64:ifc )
		# check for mkl (in several directories)
		try_libdirs="/opt/intel/mkl72/lib/64
			     /opt/intel/mkl701/lib/64
			     /opt/intel/mkl70/lib/64
			     /opt/intel/mkl/mkl61/lib/64
			     /opt/intel/mkl/lib/64
			     /opt/intel/mkl61/lib/64"
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_dgemm # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			FFLAGS="$test_fflags"
			LDFLAGS="$test_ldflags $try_loption"
			LIBS="-lguide"
			AC_SEARCH_LIBS(dgemm, mkl_ipf, have_blas=1
				       blas_libs="$try_loption $LIBS")
			if test "$ac_cv_search_dgemm" != "no"
			then break ; fi
		done
		;;

	linux32:ifort | linux32:ifc )
		# check for mkl (in several directories)
		try_libdirs="/opt/intel/mkl72/lib/32
			     /opt/intel/mkl701/lib/32
			     /opt/intel/mkl70/lib/32
			     /opt/intel/mkl/mkl61/lib/32
			     /opt/intel/mkl/lib/32
			     /opt/intel/mkl61/lib/32
			     /cineca/prod/intel/lib"
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_dgemm # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			FFLAGS="$test_fflags"
			LDFLAGS="$test_ldflags $try_loption"
			LIBS="-lguide -lpthread"
			AC_SEARCH_LIBS(dgemm, mkl_ia32, have_blas=1
				       blas_libs="$try_loption $LIBS")
			if test "$ac_cv_search_dgemm" != "no"
			then break ; fi
		done
		;;

	linux*:pgf* )
		# check for PGI blas
		unset ac_cv_search_dgemm # clear cached value
		FFLAGS="$test_fflags"
		LDFLAGS="$test_ldflags"
		LIBS=""
		AC_SEARCH_LIBS(dgemm, blas, have_blas=1 blas_libs="$LIBS")
		;;

	aix:* )
		# check for essl
		unset ac_cv_search_dgemm # clear cached value
		FFLAGS="$test_fflags"
		LDFLAGS="$test_ldflags"
		LIBS=""
		AC_SEARCH_LIBS(dgemm, essl, have_essl=1 have_blas=1
			       blas_libs="$LIBS")
		;;

	mips:* )
		# check for complib.sgimath
		unset ac_cv_search_dgemm # clear cached value
		FFLAGS="$test_fflags"
		LDFLAGS="$test_ldflags"
		LIBS=""
		AC_SEARCH_LIBS(dgemm, complib.sgimath, have_blas=1
			       blas_libs="$LIBS")
		;;

	alpha:* | alinux:* )
		# check for cxml
		unset ac_cv_search_dgemm # clear cached value
		FFLAGS="$test_fflags"
		LDFLAGS="$test_ldflags"
		LIBS=""
		AC_SEARCH_LIBS(dgemm, cxml, have_blas=1 blas_libs="$LIBS")
		;;

	sparc:* )
		# check for SUNperf library
		unset ac_cv_search_zggev # clear cached value
		FFLAGS="$test_fflags"
		LDFLAGS="$test_ldflags"
		LIBS=""
		AC_SEARCH_LIBS(dgemm, sunperf, have_blas=1
			       blas_libs="-xlic_lib=sunperf $LIBS")
		;;

	esac

	if test "$have_blas" -eq 0
	then
		# check for atlas (in several directories)
		case "$f90_id" in
		ifort | ifc )
			try_libdirs="/usr/local/lib /cineca/prod/intel/lib" ;;
		pgf* )	try_libdirs="/usr/local/lib /cineca/prod/pgi/lib"   ;;
		g95 )	try_libdirs="/usr/local/lib /cineca/prod/gnu/lib"   ;;
		* )	try_libdirs="/usr/local/lib"                        ;;
		esac
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_dgemm # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			FFLAGS="$test_fflags"
			LDFLAGS="$test_ldflags $try_loption"
			LIBS="-latlas -lg2c"
			AC_SEARCH_LIBS(dgemm, f77blas, have_blas=1
				       blas_libs="$try_loption $LIBS")
			if test "$ac_cv_search_dgemm" != "no"
			then break ; fi
		done
	fi

	if test "$have_blas" -eq 0
	then
		# check for blas (in several directories)
		case "$f90_id" in
		ifort | ifc )
			try_libdirs="/usr/local/lib /cineca/prod/intel/lib" ;;
		pgf* )	try_libdirs="/usr/local/lib /cineca/prod/pgi/lib"   ;;
		g95 )	try_libdirs="/usr/local/lib /cineca/prod/gnu/lib"   ;;
		* )	try_libdirs="/usr/local/lib"                        ;;
		esac
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_dgemm # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			FFLAGS="$test_fflags"
			LDFLAGS="$test_ldflags $try_loption"
			LIBS=""
			AC_SEARCH_LIBS(dgemm, blas, have_blas=1
				       blas_libs="$try_loption $LIBS")
			if test "$ac_cv_search_dgemm" != "no"
			then break ; fi
		done
	fi
fi
echo setting BLAS_LIBS... $blas_libs

# check for lapack
# supported vendor replacements:
#   mkl on linux
#   SUNperf on sparc
# internal version is used if none is found
if test "$lapack_libs" = ""
then
	# check directories in LD_LIBRARY_PATH too
	# (maybe they are already searched by default, but I'm not sure)
	ld_library_path=`echo $LD_LIBRARY_PATH | sed 's/:/ /g'`

	# build list of directories to search
	case "$arch" in
	mac )    try_libdirs="/usr/local/lib /sw/lib" ;;
	*)       try_libdirs="/usr/local/lib"         ;;
	esac

	# search
	case "$arch:$f90_id" in

	linux64:ifort | linux64:ifc )
		# check for mkl (in several directories)
		try_libdirs="/opt/intel/mkl72/lib/64
			     /opt/intel/mkl701/lib/64
			     /opt/intel/mkl70/lib/64
			     /opt/intel/mkl/mkl61/lib/64
			     /opt/intel/mkl/lib/64
			     /opt/intel/mkl61/lib/64"
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_zggev # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			FFLAGS="$test_fflags"
			LDFLAGS="$test_ldflags $try_loption"
			LIBS="$blas_libs"
			AC_SEARCH_LIBS(zggev, mkl_lapack, have_lapack=1
				       lapack_libs="$try_loption -lmkl_lapack")
			if test "$ac_cv_search_zggev" != "no"
			then break ; fi
		done
		;;

	linux32:ifort | linux32:ifc )
		# check for mkl (in several directories)
		try_libdirs="/opt/intel/mkl72/lib/32
			     /opt/intel/mkl701/lib/32
			     /opt/intel/mkl70/lib/32
			     /opt/intel/mkl/mkl61/lib/32
			     /opt/intel/mkl/lib/32
			     /opt/intel/mkl61/lib/32
			     /cineca/prod/intel/lib"
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_zggev # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			FFLAGS="$test_fflags"
			LDFLAGS="$test_ldflags $try_loption"
			LIBS="$blas_libs"
			AC_SEARCH_LIBS(zggev, mkl_lapack, have_lapack=1
				       lapack_libs="$try_loption -lmkl_lapack")
			if test "$ac_cv_search_zggev" != "no"
			then break ; fi
		done
		;;

	sparc:* )
		# check for SUNperf library
		unset ac_cv_search_zggev # clear cached value
		FFLAGS="$test_fflags"
		LDFLAGS="$test_ldflags"
		LIBS="$blas_libs"
		AC_SEARCH_LIBS(zggev, sunperf, have_lapack=1
			       lapack_libs="-xlic_lib=sunperf $LIBS")
		;;

	esac

	if test "$have_lapack" -eq 0
	then
		# check for lapack (in several directories)
		case "$f90_id" in
		ifort | ifc )
			try_libdirs="/usr/local/lib /cineca/prod/intel/lib" ;;
		pgf* )	try_libdirs="/usr/local/lib /cineca/prod/pgi/lib"   ;;
		g95 )	try_libdirs="/usr/local/lib /cineca/prod/gnu/lib"   ;;
		*xlf* ) try_libdirs="/usr/local/lib /cineca/lib"            ;;
		* )	try_libdirs="/usr/local/lib"                        ;;
		esac
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_zggev # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			FFLAGS="$test_fflags"
			LDFLAGS="$test_ldflags $try_loption"
			LIBS="$blas_libs"
			AC_SEARCH_LIBS(zggev, lapack, have_lapack=1
				       lapack_libs="$try_loption -llapack")
			if test "$ac_cv_search_zggev" != "no"
			then break ; fi
		done
	fi
	# essl must precede lapack (if present)
	if test "$have_essl" -ne 0 && test "$have_lapack" -ne 0
	then lapack_libs="-lessl $lapack_libs" ; fi
fi
echo setting LAPACK_LIBS... $lapack_libs

# check for fftw
# supported vendor replacements:
#   essl on aix
#   SUNperf on sparc
# internal version is used if none is found
if test "$fft_libs" = ""
then
	# check directories in LD_LIBRARY_PATH too
	# (maybe they are already searched by default, but I'm not sure)
	ld_library_path=`echo $LD_LIBRARY_PATH | sed 's/:/ /g'`

	# build list of directories to search
	case "$arch" in
	mac )    try_libdirs="/usr/local/lib /sw/lib" ;;
	*)       try_libdirs="/usr/local/lib"         ;;
	esac

	# search
	case "$arch" in
	aix )
		# check for essl
		unset ac_cv_search_dcft # clear cached value
		FFLAGS="$test_fflags"
		LDFLAGS="$test_ldflags"
		LIBS="$fft_libs"
		AC_SEARCH_LIBS(dcft, essl, have_fft=1 fft_libs="$LIBS")
		;;
	sparc )
		# check for SUNperf library
		unset ac_cv_search_zfft3i # clear cached value
		FFLAGS="$test_fflags"
		LDFLAGS="$test_ldflags"
		LIBS="$libs"
		AC_SEARCH_LIBS(zfft3i, sunperf, have_fft=1
			       fft_libs="-xlic_lib=sunperf $LIBS")
		;;
	esac

	if test "$have_fft" -eq 0
	then
		AC_LANG_PUSH(C)

		# check for fftw (in several directories)
		case "$f90_id" in
		ifort | ifc )
			try_libdirs="/usr/local/lib /cineca/prod/intel/lib" ;;
		pgf* )	try_libdirs="/usr/local/lib /cineca/prod/pgi/lib"   ;;
		* )	try_libdirs="/usr/local/lib /cineca/prod/gnu/lib"   ;;
		esac
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_fftwnd # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			CFLAGS="$test_cflags"
			CPPFLAGS="$test_cppflags"
			LDFLAGS="$c_ldflags $try_loption"
			LIBS="$fft_libs"
			AC_SEARCH_LIBS(fftwnd, fftw, have_fftw=1
				       fft_libs="$try_loption $LIBS", , -lm)
			if test "$ac_cv_search_fftwnd" != "no"
			then break ; fi
		done

		AC_LANG_POP(C)
	fi
fi
echo setting FFT_LIBS... $fft_libs

# check for mpi
# some architectures require to link mpi libraries explicitly
if test "$mpi_libs" = ""
then
	# check directories in LD_LIBRARY_PATH too
	# (maybe they are already searched by default, but I'm not sure)
	ld_library_path=`echo $LD_LIBRARY_PATH | sed 's/:/ /g'`

	# build list of directories to search
	case "$arch" in
	mac )    try_libdirs="/usr/local/lib /sw/lib" ;;
	*)       try_libdirs="/usr/local/lib"         ;;
	esac

	# search
	if test "$use_parallel" -ne 0
	then
		case "$arch" in
		alpha )
			AC_LANG_PUSH(C)
			CFLAGS="$test_cflags"
			CPPFLAGS="$test_cppflags"
			LDFLAGS="$c_ldflags"
			LIBS=""
			AC_SEARCH_LIBS(elan_baseInit, elan, mpi_libs="$LIBS")
			LIBS="-lmpi $mpi_libs"
			AC_SEARCH_LIBS(mpi_waitany_, fmpi, have_mpi=1
				       mpi_libs="$LIBS")
			AC_LANG_POP(C)

			LIBS="$mpi_libs"
			AC_SEARCH_LIBS(pmpi_init, pmpi, mpi_libs="$LIBS")
			;;
		esac

		if test "$have_mpi" -eq 0
		then
			# check for mpi
			unset ac_cv_search_mpi_init # clear cached value
			LDFLAGS="$test_ldflags"
			LIBS="$mpi_libs"
			AC_SEARCH_LIBS(mpi_init, mpi,
				       have_mpi=1 mpi_libs="$LIBS")
		fi
	fi
fi
echo setting MPI_LIBS... $mpi_libs

# check for mass on aix
if test "$mass_libs" = ""
then
	# check directories in LD_LIBRARY_PATH too
	# (maybe they are already searched by default, but I'm not sure)
	ld_library_path=`echo $LD_LIBRARY_PATH | sed 's/:/ /g'`

	# build list of directories to search
	case "$arch" in
	mac )    try_libdirs="/usr/local/lib /sw/lib" ;;
	*)       try_libdirs="/usr/local/lib"         ;;
	esac

	# search
	case "$arch" in
	aix )
		# check for mass (in several directories)
		try_libdirs="/usr/local/lib /cineca/lib /cineca/lib/mass"
		try_libdirs="$libdirs $try_libdirs $ld_library_path"

		for dir in none $try_libdirs
		do
			unset ac_cv_search_vexp # clear cached value
			if test "$dir" = "none"
			then
				try_loption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_loption="-L$dir"
			fi
			FFLAGS="$test_fflags"
			LDFLAGS="$test_ldflags $try_loption"
			LIBS=""
			AC_SEARCH_LIBS(vexp, massvp4 massv, , , -lmass)
			if test "$ac_cv_search_vexp" = "-lmassvp4" \
				-or "$ac_cv_search_vexp" = "-lmassv"
			then mass_libs="$try_loption $ac_cv_search_vexp -lmass"
			fi
			if test "$ac_cv_search_vexp" != "no" ; then break ; fi
		done
		;;
	esac
fi
echo setting MASS_LIBS... $mass_libs

# final checks on available libraries
FFLAGS="$test_fflags"
LDFLAGS="$test_ldflags"
parallel=0

if test "`echo $lapack_libs | grep mkl`" != ""
then
	mylib="lapack_mkl"
else
	LIBS="$lapack_libs $blas_libs"
	AC_SEARCH_LIBS(zggev, "", , mylib="lapack")
	AC_SEARCH_LIBS(dgemm, "", , mylib="blas_and_lapack")
fi

LIBS="$mass_libs"
AC_SEARCH_LIBS(vexp, "", try_dflags="$try_dflags -D__MASS")

if test "$arch" = "aix"
then
	LIBS="$fft_libs"
	AC_SEARCH_LIBS(dcft, "", have_fft=1)
fi

if test "$have_fft" -eq 0
then
	AC_LANG_PUSH(C)

	if test "$have_fft" -eq 0
	then
		try_dflags="$try_dflags -D__FFTW"

		CFLAGS="$test_cflags"
		LDFLAGS="$c_ldflags"
		LIBS="$fft_libs"
		AC_SEARCH_LIBS(fftwnd, "", have_fft=1 have_fftw=1)
	fi

	# find location of fftw.h (if needed)
	if test "$have_fftw" -ne 0
	then
		if test "$includefftw" = ""
		then
			# if libfftw is in /some/path/lib, then fftw.h is
			# probably in /some/path/include
			includefftw=`echo $fft_libs |
				sed 's/.*-L\([[^ ]]*\)  *-lfftw.*/\1/
				     s/lib/include/'`
		fi
		try_includedirs="$includefftw /usr/local/include \
				 /cineca/lib/fftw-2.1.3/fftw"
		for dir in none $try_includedirs
		do
			unset ac_cv_header_fftw_h # clear cached value
			if test "$dir" = "none"
			then
				try_ioption=
			else
				echo $ECHO_N "in $dir: " $ECHO_C
				try_ioption="-I$dir"
			fi
			CFLAGS="$test_cflags $try_ioption"
			CPPFLAGS="$test_cppflags $try_ioption"
			LDFLAGS="$c_ldflags"
			LIBS="$fft_libs"
			AC_CHECK_HEADER(fftw.h, have_fftw_h=1
					ifftw="$try_ioption")
			if test "$ac_cv_header_fftw_h" != "no"
			then break ; fi
		done
	fi

	# if no valid FFT library was found, use our implementation
	if test "$have_fft" -eq 0
	then
		try_dflags="$try_dflags -D__USE_INTERNAL_FFTW"
	fi

	if test "$have_fftw" -ne 0 && test "$have_fftw_h" -eq 0
	then
		try_dflags="$try_dflags -D__USE_INTERNAL_FFTW"
		AC_MSG_WARN([fftw library detected, but fftw.h not found])
	fi

	AC_LANG_POP(C)
fi

if test "$use_parallel" -ne 0
then
	LIBS="$mpi_libs"
	AC_SEARCH_LIBS(mpi_init, "", parallel=1
		       try_dflags="$try_dflags -D__MPI -D__PARA")
fi

AC_LANG_POP(Fortran 77)

if test "$dflags" = "" ; then dflags="$try_dflags" ; fi
echo setting DFLAGS... $dflags

# xlf compilers (AIX and powerpc) want comma-separated -D directives
if test "$xlf_flags" -ne 0
then
	fdflags="`echo $dflags | sed 's/  */,/g'`"
else
	fdflags="\$(DFLAGS)"
fi
echo setting FDFLAGS... $fdflags

if test "$ranlib" = "" ; then ranlib=echo ; fi
echo setting RANLIB... $ranlib
echo setting MYLIB... $mylib

# generate dependencies
if test -x $topdir/makedeps.sh
then
	echo checking dependencies...
	( cd $topdir ; ./makedeps.sh )
fi

# export settings to generated files
AC_SUBST(cc)
AC_SUBST(cflags)
AC_SUBST(dflags)
AC_SUBST(fdflags)
AC_SUBST(cpp)
AC_SUBST(cppflags)
AC_SUBST(f77)
AC_SUBST(f90)
AC_SUBST(fflags)
AC_SUBST(f90flags)
AC_SUBST(fflags_noopt)
AC_SUBST(f90flags_noopt)
AC_SUBST(pre_fdflags)
AC_SUBST(imod)
AC_SUBST(ifftw)
AC_SUBST(ld)
AC_SUBST(ldflags)
AC_SUBST(blas_libs)
AC_SUBST(lapack_libs)
AC_SUBST(fft_libs)
AC_SUBST(mpi_libs)
AC_SUBST(mass_libs)
AC_SUBST(mylib)
AC_SUBST(ar)
AC_SUBST(arflags)
AC_SUBST(ranlib)
AC_SUBST(f90rule)

AC_CONFIG_FILES(make.sys)

AC_OUTPUT

# final warnings
echo --------------------------------------------------------------------
echo ESPRESSO can take advantage of several optimized numerical libraries
echo \(essl, fftw, mkl...\).  This configure script attempts to find them,
echo but may fail if they have been installed in non-standard locations.
echo
echo The following libraries have been found:

echo "  BLAS_LIBS=$blas_libs"
echo "  LAPACK_LIBS=$lapack_libs"
echo "  FFT_LIBS=$fft_libs"
if test "$have_fft" -ne 0 && test "$have_fftw" -ne 0 &&
	test "$have_fftw_h" -eq 0
then
	echo "  WARNING: fftw library detected, but fftw.h not found"
fi
if test "$mpi_libs" != "" ; then echo "  MPI_LIBS=$mpi_libs" ; fi
if test "$arch" = "aix" ; then echo "  MASS_LIBS=$mass_libs" ; fi

echo
echo If any libraries are missing, you may specify a list of directories
echo to search and retry, as follows:
echo "  ./configure LIBDIRS=\"list of directories, separated by spaces\""
echo
echo For more information, read the ESPRESSO User\'s Guide \
\(Doc/users-guide.tex\).
echo --------------------------------------------------------------------

if test "$use_parallel" -ne 0 && test "$parallel" -eq 0
then
	echo ----------------------------------------------
	echo parallel environment not detected
	echo this program will run in single-processor mode
	echo ----------------------------------------------
fi