dnl Process this file with autoconf to produce a configure script
AC_INIT(Singular/matpol.h)
AC_PREFIX_DEFAULT(`pwd`)

AC_CANONICAL_SYSTEM


dnl lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
dnl those are needed to check for libs and headers, later on
dnl
AC_PROG_CC
AC_PROG_CPP
AC_AIX

dnl and add to -I to CPPFLAGS and and -Lto LDFLAGS, just to be sure
if test "$libdir" = '${exec_prefix}/lib'; then
  if test "x$exec_prefix" = xNONE; then
    if test "x$prefix" = xNONE; then
      LDFLAGS="-L${ac_default_prefix}/lib ${LDFLAGS}"
    else
      LDFLAGS="-L${prefix}/lib ${LDFLAGS}"
    fi
  else
    LDFLAGS="-L${exec_prefix}/lib ${LDFLAGS}"
  fi
else
  LDFLAGS="-L${libdir} ${LDFLAGS}"
fi

if test "$includedir" = '${prefix}/include'; then
  if test "x$prefix" = xNONE; then
    CPPFLAGS="-I${ac_default_prefix}/include ${CPPFLAGS}"
  else
    CPPFLAGS="-I${prefix}/include ${CPPFLAGS}"
  fi
else
  CPPFLAGS="-I${includedir} ${CPPFLAGS}"
fi

dnl pass default prefix on to subdirs, if not explicitely given as an option
if test "x$prefix" = xNONE; then
  ac_configure_args="$ac_configure_args --prefix=$ac_default_prefix"
fi

AC_MSG_CHECKING(whether _AIX is defined)
AC_CACHE_VAL(ac_cv_is_aix,
AC_EGREP_CPP(yes,
[#ifdef _AIX
    yes
#endif
], ac_cv_is_aix=yes, ac_cv_is_aix=no, 1))
if test "$ac_cv_is_aix" = yes; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi


dnl lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
dnl check for various libraries and headers
dnl
AC_CHECK_LIB(m, atof)
AC_CHECK_LIB(gmp, mpz_init)
AC_CHECK_LIB(MP, IMP_PutGmpInt)
AC_CHECK_LIB(MPT, MPT_GetTree)
AC_CHECK_LIB(singcf, atof)
AC_CHECK_LIB(singfac, atof)

AC_CHECK_HEADERS(gmp.h MP.h  MPT.h factory.h factor.h)

if test "$ac_cv_lib_gmp_mpz_init" = yes && \
 test "$ac_cv_header_gmp_h" = yes; then
    ac_gmp_ok=yes
fi

if test "$ac_cv_lib_MP_IMP_PutGmpInt" = yes && \
 test "$ac_cv_lib_MPT_MPT_GetTree" && \
 test "$ac_cv_header_MP_h" = yes && \
 test "$ac_cv_header_MPT_h" = yes; then
  ac_MP_ok=yes
fi

if test "$ac_cv_lib_singcf_initCanonicalForm" = yes && \
 test "$ac_cv_header_factory_h" = yes; then
  ac_factory_ok=yes
fi

if test "$ac_cv_lib_singfac_IrrCharSeries" = yes && \
 test "$ac_cv_header_factor_h" = yes; then
  ac_libfac_ok=yes
fi


  
dnl lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
dnl Check whether or not to built various packages
dnl
AC_ARG_ENABLE(gmp, \
 [ --enable-PACKAGE        configure and build PACKAGE
  --disable-PACKAGE       do not configure and build PACKAGE
  --with-PACKAGE          use PACKAGE, provide dependent functionality
  --without-PACKAGE       do not use PACKAGE, disable dependent functionality
 where PACKAGE can be:
     gmp                  GNU multiple precision library])
AC_ARG_ENABLE(MP, \
 [    MP                   Multi Protocol library])
AC_ARG_ENABLE(factory, \
 [    factory              polynomial factorization library])
AC_ARG_ENABLE(libfac, \
 [    libfac               char set and modp poly factorization library])
AC_ARG_ENABLE(Singular, \
 [    Singular,            CAS for commutative algebra])

AC_MSG_CHECKING(whether to configure and build gmp lib)
if test "$enable_gmp" != yes && test "$enable_gmp" != no; then
  if test "$with_gmp" != no && test "$ac_gmp_ok" != yes; then
    enable_gmp=yes
  else
    enable_gmp=no
  fi
fi
if test "$enable_gmp" = yes && test -d gmp; then
  if test "$ac_cv_is_aix" = yes && test "$GCC" = yes; then
    AC_MSG_RESULT(no)
    AC_MSG_WARN(Building gmp v2 with gcc results in a gmp lib with bugs)
    AC_MSG_WARN(Install gmp v2 with another compiler first or use gmp v1.3)
    AC_MSG_WARN(For the time being gmp is neither configured/built nor used) 
    enable_gmp=no
    ac_configure_args="$ac_configure_args --disable-gmp"
  else
    AC_MSG_RESULT(yes)
    CONFIG_SUBDIRS="gmp"
    ac_configure_args="$ac_configure_args --enable-gmp"
  fi
else
  AC_MSG_RESULT(no)
  if  test "$enable_gmp" = yes && test ! -d gmp; then
    AC_MSG_WARN(Did not find gmp subdirectory)
  fi
  enable_gmp=no
  ac_configure_args="$ac_configure_args --disable-gmp"
fi

AC_MSG_CHECKING(whether to configure and build MP lib)
if test "$enable_MP" != yes && test "$enable_MP" != no; then
  if test "$with_MP" != no && test "$ac_MP_ok" != yes; then
    enable_MP=yes
  else
    enable_MP=no
  fi
fi
if test "$enable_MP" = yes && test -d MP; then
  if test "$ac_gmp_ok" = yes || test "$enable_gmp" = yes; then
    AC_MSG_RESULT(yes)
    CONFIG_SUBDIRS="$CONFIG_SUBDIRS MP"
    ac_configure_args="$ac_configure_args --enable-MP"
  else
    AC_MSG_RESULT(no)
    AC_MSG_WARN(Can not build MP for Singular without having gmp)
    enable_MP=no
    ac_configure_args="$ac_configure_args --disable-MP"
  fi
else
  AC_MSG_RESULT(no)
  if  test "$enable_MP" = yes && test ! -d MP; then
    AC_MSG_WARN(Did not find MP subdirectory)
  fi
  enable_MP=no
  ac_configure_args="$ac_configure_args --disable-MP"
fi

if test "$with_builtingmp" = yes; then
  enable_gmp=yes
  ac_configure_args="$ac_configure_args --enable-gmp"
fi

AC_MSG_CHECKING(whether to configure and build factory lib)
if test "$enable_factory" != yes && test "$enable_factory" != no; then
  if test "$with_factory" != no && test "$ac_factory_ok" != yes; then
    enable_factory=yes
  else
    enable_factory=no
  fi
fi
if test "$enable_factory" = yes && test -d factory; then
  if test "$ac_gmp_ok" = yes || test "$enable_gmp" = yes; then
  AC_MSG_RESULT(yes)
  CONFIG_SUBDIRS="$CONFIG_SUBDIRS factory"
  ac_configure_args="$ac_configure_args --enable-factory"
  else
    AC_MSG_RESULT(no)
    AC_MSG_WARN(Can not build factory without having gmp)
    enable_factory=no
    ac_configure_args="$ac_configure_args --disable-factory"
  fi
else
  AC_MSG_RESULT(no)
  if  test "$enable_factory" = yes && test ! -d factory; then
    AC_MSG_WARN(Did not find factory subdirectory)
  fi
  enable_factory=no
  ac_configure_args="$ac_configure_args --disable-factory"
fi

AC_MSG_CHECKING(whether to configure and build libfac lib)
if test "$enable_libfac" != yes && test "$enable_libfac" != no; then
  if test "$with_libfac" != no && test "$ac_libfac_ok" != yes; then
    enable_libfac=yes
  else
    enable_libfac=no
  fi
fi
if test "$enable_libfac" = yes && test -d libfac; then
  if test "$ac_factory_ok" = yes || test "$enable_factory" = yes; then
  AC_MSG_RESULT(yes)
  CONFIG_SUBDIRS="$CONFIG_SUBDIRS libfac"
  ac_configure_args="$ac_configure_args --enable-libfac"
  else
    AC_MSG_RESULT(no)
    AC_MSG_WARN(Can not build libfac without factory)
    enable_libfac=no
    ac_configure_args="$ac_configure_args --disable-libfac"
  fi
else
  AC_MSG_RESULT(no)
  if  test "$enable_libfac" = yes && test ! -d libfac; then
    AC_MSG_WARN(Did not find libfac subdirectory)
  fi
  enable_libfac=no
  ac_configure_args="$ac_configure_args --disable-libfac"
fi

AC_MSG_CHECKING(whether to configure and build Singular)
if test "$enable_Singular" != yes && test "$enable_Singular" != no; then
  if test "$with_Singular" != no; then
    enable_Singular=yes
  else
    enable_Singular=no
  fi
fi
if test "$enable_Singular" = yes && test -d Singular; then
  AC_MSG_RESULT(yes)
  CONFIG_SUBDIRS="$CONFIG_SUBDIRS Singular"
  ac_configure_args="$ac_configure_args --enable-Singular"
else
  AC_MSG_RESULT(no)
  if  test "$enable_Singular" = yes && test ! -d Singular; then
    AC_MSG_WARN(Did not find Singular subdirectory)
  fi
  enable_Singular=no
  ac_configure_args="$ac_configure_args --disable-Singular"
fi


dnl lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
dnl Check whether or not to use various packages
dnl
AC_MSG_CHECKING(whether to use with gmp)
if test "$with_gmp" != no && test "$with_gmp" != yes; then
  if test "$ac_gmp_ok" = yes || test "$enable_gmp" = yes; then
    with_gmp=yes
  else
    with_gmp=no
  fi
  ac_configure_args="$ac_configure_args --with-gmp=$with_gmp"
fi
if test "$with_gmp" = yes; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(whether to use with MP)
if test "$with_MP" != no && test "$with_MP" != yes; then
  if test "$ac_MP_ok" = yes || test "$enable_MP" = yes; then
    with_MP=yes
  else
    with_MP=no
  fi
  ac_configure_args="$ac_configure_args --with-MP=$with_MP"
fi
if test "$with_MP" = yes; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(whether to use with factory)
if test "$with_factory" != no && test "$with_factory" != yes; then
  if test "$ac_factory_ok" = yes || test "$enable_factory" = yes; then
    with_factory=yes
  else
    with_factory=no
  fi
  ac_configure_args="$ac_configure_args --with-factory=$with_factory"
fi
if test "$with_factory" = yes; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(whether to use with libfac)
if test "$with_libfac" != no && test "$with_libfac" != yes; then
  if test "$ac_libfac_ok" = yes || test "$enable_libfac" = yes; then
    with_libfac=yes
  else
    with_libfac=no
  fi
  ac_configure_args="$ac_configure_args --with-libfac=$with_libfac"
fi
if test "$with_libfac" = yes; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

AC_MSG_CHECKING(whether to use with Singular)
if test "$with_Singular" != no && test "$with_Singular" != yes; then
  if test "$enable_Singular" = yes; then
    with_Singular=yes
  else
    with_Singular=no
  fi
  ac_configure_args="$ac_configure_args --with-Singular=$with_Singular"
fi

if test "$with_Singular" != no; then
  AC_MSG_RESULT(yes)
else
  AC_MSG_RESULT(no)
fi

dnl lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
dnl Check for known subdirs
dnl
if test -d gmp; then
  SUBDIRS="gmp"
fi
if test -d MP; then
  SUBDIRS="$SUBDIRS MP"
fi
if test -d factory; then
  SUBDIRS="$SUBDIRS factory"
fi
if test -d libfac; then
  SUBDIRS="$SUBDIRS libfac"
fi
if test -d Singular; then
  SUBDIRS="$SUBDIRS Singular"
fi
  

dnl lllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll
dnl Enough --wrap it up
dnl
AC_PROG_MAKE_SET
AC_SUBST(SUBDIRS)
AC_SUBST(CONFIG_SUBDIRS)
AC_CONFIG_SUBDIRS($CONFIG_SUBDIRS) 

AC_OUTPUT(Makefile)