get_config_options

# Processing Options
dflt_conf_file=pari.cfg
fastread=yes
config_file=
optimization=full
target_host=
which_graphic_lib=auto
thread_engine=single
share_prefix=
prefix=/usr/local
test -n "$GP_INSTALL_PREFIX" && prefix="$GP_INSTALL_PREFIX"

while test $# -gt 0; do
  case "$1" in
  -l|--load) shift; initfile=$1;
     cd "$TOP"
     PATH=.:$PATH; export PATH
     if test -z "$1";then
       tmp_host=`$config_dir/arch-osname`
       arch=`echo "$tmp_host" | sed -e 's/\(.*\)-.*/\1/'`
       osname=`echo "$tmp_host" | sed -e 's/.*-\(.*\)/\1/'`
       objdir=O$osname-$arch;
       initfile=$objdir/$dflt_conf_file;
     fi
     if test -d "$initfile"; then
       initfile="$initfile/pari.cfg"
     fi
     if test -r "$initfile"; then
       . $initfile
       if test ! -d $objdir; then mkdir $objdir; fi
       . $config_dir/get_tests # in case the test set have been changed
       . $config_dir/extract_files
       exit 0
     else
       echo "Cannot read config file \"$initfile\"." >&2
       exit 1
     fi;;
  -p|-prefix)   shift; prefix=$1;;
  --prefix=*|--prefi=*|--pref=*|--pre=*|--pr=*|--p=*)
               prefix=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --share-prefix=*)
               share_prefix=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --bindir=*) dfltbindir=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --datadir=*) dfltdatadir=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --includedir=*) dfltincludedir=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --libdir=*) dfltlibdir=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --mandir=*) dfltmandir=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --sysdatadir=*) dfltsysdatadir=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --time=*) timing_fun=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --host=*) target_host=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --kernel=*) kernel=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --mt=*) thread_engine=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --tune) tune=yes;;
  --builddir) dfltobjdir=auto;;
  --builddir=*) dfltobjdir=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  -a|-ask|--ask)     fastread=no;;
  -g)          optimization=debugging;;
  -pg)         optimization=profiling;;
  -gcov)       optimization=gcov;;
  -h|-help|--help|-\?)error=true;;
  -v|-verbhelp|--verbhelp)error=verb;;
  -s|--static) static=y;;
  -graphic|--graphic) shift; which_graphic_lib=$1;;
  --graphic=*|--graphi=*|--graph=*|--grap=*|--gra=*|--gr=*|--g=*)
	       which_graphic_lib=`echo "$1" | sed -e 's/[-a-z]*=//'`;;
  --with-runtime-perl=*)
      runtime_perl=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --without-readline|--with-readline=no) without_readline=yes ;;
  --with-readline) with_readline=yes ;;
  --with-readline=*)
      with_readline=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --with-readline-lib=*)
      with_readline_lib=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --with-readline-include=*)
      with_readline_include=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;

  --without-gmp|--with-gmp=no) without_gmp=yes ;;
  --with-gmp) with_gmp=yes ;;
  --with-gmp=*)
      with_gmp=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --with-gmp-lib=*)
      with_gmp_lib=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --with-gmp-include=*)
      with_gmp_include=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;

  --with-ncurses-lib=*|--with-ncurses=*)
      with_ncurses_lib=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;

  --with-qt) with_qt=yes ;;
  --with-qt=*)
      with_qt=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --with-qt-lib=*)
      with_qt_lib=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --with-qt-include=*)
      with_qt_include=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;

  --with-fltk) with_fltk=yes ;;
  --with-fltk=*)
      with_fltk=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --enable-tls) enable_tls=yes;;
  --enable-tls=*) enable_tls=`echo "$1" | sed -e 's/[-a-z]*=//'` ;;
  --disable-tls) enable_tls=no;;
  --disable-mmap) enable_mmap=no;;
  *) echo "*** Unrecognized option $1." >&2; error=true;;
  esac
  shift
done
# Convert relative paths to absolute.
# Variables that can be set interactively should not be listed here,
# see get_install.
for i in with_readline with_readline_lib with_readline_include \
         with_gmp with_gmp_lib with_gmp_include \
         with_ncurses_lib with_qt with_fltk ; do
  eval "dflt=\"\$$i\""
  case $dflt in
    ''|yes|/*) ;;
            *) eval "$i='$TOP/$dflt'";;
  esac
done
# The behaviour of $prefix/lib --> '//lib' is implementation-dependent
case "$prefix" in /) prefix=;; esac
case "$share_prefix" in /) prefix=;; esac

case "$error" in
true) cat >&2 <<EOT
Usage: Configure [-ask|-help|-g|-pg] [ --load <filename> ] [ --prefix=<dir> ]

Options: some names can be abbreviated to one character (e.g -h = -help)
-a, --ask        interactive configuration
-h, --help       this message
-l, --load       skip Configure and specify a default config file
-s, --static     build static GP binary only
-v, --verbhelp   a longer help message
Build Options:
  --host=<arch-osname>  target achitecture
  --kernel=<kern>       kernel used
  --graphic=<gr>        graphic library used (none, X11, Qt, fltk, ps, svg,
                          win32)
  --time=<fun>          timing function to use (getrusage, clock_gettime,
                          times, ftime)
  --builddir=<dir>      directory where the object files will be created
  --tune                tune the binary for compiling host (slow)
  --mt=pthread	        enable pthread thread engine
  --mt=mpi	        enable MPI thread engine
Additional developer options:
  -g              creates debugging version (in Oxxx.dbg)
  -pg             creates profiling version (in Oxxx.prf)
  -gcov           creates gcov version (in Oxxx.gcov)
  --enable-tls	  enable thread-local stack
  --disable-mmap  (*troubleshooting*) disable mmap usage

Installation directories:
  --prefix=<dir>        install files in <dir> (default $prefix)
  --share-prefix=<dir>  as 'prefix', for architecture independent files
  --bindir=<dir>        for binaries
  --includedir=<dir>    for C header files
  --libdir=<dir>        for libraries
  --mandir=<dir>        for manual pages
  --sysdatadir=<dir>    for architecture-dependent data
  --datadir=<dir>       for architecture-independent data

Optional libraries:
  --without-readline          do not link with GNU readline
  --with-readline[=DIR]       use GNU readline [prefix for readline files]
  --with-readline-include=DIR specify location of readline headers
  --with-readline-lib=DIR     specify location of readline libs
  --with-ncurses-lib=DIR      specify location of ncurses lib (for readline)

  --without-gmp               use the native kernel instead of GNU MP
  --with-gmp[=DIR]            use the GMP kernel [prefix for gmp files]
  --with-gmp-include=DIR      specify location of gmp headers
  --with-gmp-lib=DIR          specify location of gmp libs

  --with-qt[=DIR]            use the Qt graphical library [prefix for Qt dir.]
  --with-qt-include=DIR      specify location of Qt headers
  --with-qt-lib=DIR          specify location of Qt libs

  --with-fltk                use the FLTK graphical library [need fltk-config]

Miscellaneous
  --with-runtime-perl[=path-to-perl-binary] for gphelp / tex2mail

Environment variables affecting the build:
  CC                     C compiler
  CFLAGS                 additional flags to the C compiler
  LD                     linker
  LDFLAGS                additional linker flags
  DLLDFLAGS              additional linker flags for linking the shared lib
  C_INCLUDE_PATH         directories to search for include files (separate by :)
  LIBRARY_PATH           directories to search for libraries (separate by :)

EOT
exit 1
;;
verb) cat >&2 <<EOT
Architecture, operating system and asm kernel.
  Configure tries to detect what is the architecture of the machine (CPU type)
  and what operating system it is running. Then, it decides whether an asm
  kernel exists and should be used. You can override this with Configure -ask.
Which compiler will be used ?
  Depending on the machine (architecture and operating system) and on what is
  found in the path, a compiler is automatically chosen. If you set the
  environment variable CC before typing Configure, it will be used instead.
  Typeset the installation help ('tex doc/INSTALL.tex') for more details.
EOT
exit 1
;;
esac

test "$fastread" = yes || cat <<EOT
==========================================================================
             Beginning configuration questions for GP/PARI.

You will be asked some questions about your system. Most of the time, a list
of acceptable answers will be supplied as well as a default between brackets.
Type a carriage return ('Enter') to accept these defaults.

Though the present script strives to prevent any fatal mistake on your part,
there is currently no easy way out if you make one. Your best bet is to press
Ctrl-C, then start again.  Another possibility is to wait till the questions
end, edit the file "Oxxx/$dflt_conf_file", then run

      Configure --load Oxxx/$dflt_conf_file

(which can be abbreviated to simply "Configure -l", provided your architecture
is correctly detected)
==========================================================================
EOT