dnl Process this file with autoconf to produce a configure script.
AC_INIT(ruby.h)

rb_version=`grep RUBY_VERSION $srcdir/version.h`
MAJOR=`expr "$rb_version" : '#define RUBY_VERSION "\([0-9][0-9]*\)\.[0-9][0-9]*\.[0-9][0-9]*"'`
MINOR=`expr "$rb_version" : '#define RUBY_VERSION "[0-9][0-9]*\.\([0-9][0-9]*\)\.[0-9][0-9]*"'`
TEENY=`expr "$rb_version" : '#define RUBY_VERSION "[0-9][0-9]*\.[0-9][0-9]*\.\([0-9][0-9]*\)"'`
AC_SUBST(MAJOR)
AC_SUBST(MINOR)
AC_SUBST(TEENY)
dnl checks for alternative programs
AC_ARG_WITH(gcc, [--without-gcc             never use gcc], [
	case $withval in
	no)	CC=cc
		without_gcc=yes;;
	yes)	CC=gcc
		without_gcc=no;;
	*)	CC=$withval
		without_gcc=$withval;;
	esac], [without_gcc=no])
dnl If the user switches compilers, we can't believe the cache
if test ! -z "$ac_cv_prog_CC" -a ! -z "$CC" -a "$CC" != "$ac_cv_prog_CC"
then
  AC_ERROR(cached CC is different -- throw away $cache_file
(it is also a good idea to do 'make clean' before compiling))
fi

AC_CANONICAL_HOST
AC_CANONICAL_TARGET

dnl checks for fat-binary
fat_binary=no
AC_ARG_ENABLE(fat-binary,
       [--enable-fat-binary       build a NeXT/Apple Multi Architecture Binary. ],
       [fat_binary=$enableval])
 if test "$fat_binary" = yes ; then

    AC_MSG_CHECKING(target architecture)

    case "$target_os" in
    rhapsody*)
        echo -n "MacOS X Server: "
	  	if test "$TARGET_ARCHS" = "" ; then
   	        TARGET_ARCHS="ppc i386"
  		fi
	;;
    macos*)
        echo -n "MacOS X : "
	  	if test "$TARGET_ARCHS" = "" ; then
   	        TARGET_ARCHS="ppc i386"
  		fi
	;;
    nextstep*|openstep*)
  	    echo -n "NeXTSTEP/OPENSTEP: "
	    if test "$TARGET_ARCHS" = "" ; then
	       if test `/usr/bin/arch` = "m68k" ; then
		   TARGET_ARCHS="m68k i486"
	       else # Black and Native one
		   TARGET_ARCHS="m68k `/usr/bin/arch`"
	       fi
	    fi
        ;;
    esac
    # /usr/lib/arch_tool -archify_list $TARGET_ARCHS
    for archs in $TARGET_ARCHS 
    do
        ARCH_FLAG="$ARCH_FLAG -arch $archs "
        echo -n " $archs"
    done
    AC_DEFINE(NEXT_FAT_BINARY)
    echo "."
fi 

AC_ARG_PROGRAM

dnl Checks for programs.

if test x"${build}" != x"${host}"; then
  AC_CHECK_TOOL(CC, gcc)
fi
AC_PROG_CC
AC_PROG_GCC_TRADITIONAL

AC_PROG_YACC
AC_CHECK_TOOL(RANLIB, ranlib, :)
AC_CHECK_TOOL(AR, ar)
AC_CHECK_PROGS(AR, ar aal, ar)

case "$target_os" in
    cygwin*|mingw*)
	AC_CHECK_TOOL(NM, nm)
	AC_CHECK_TOOL(DLLWRAP, dllwrap)
	AC_CHECK_TOOL(AS, as)
	AC_CHECK_TOOL(DLLTOOL, dlltool)
	;;
esac

AC_PROG_LN_S
AC_PROG_MAKE_SET

# checks for UNIX variants that set C preprocessor variables
AC_MINIX

AC_EXEEXT
AC_OBJEXT

AC_CHECK_SIZEOF(int, 4)
AC_CHECK_SIZEOF(short, 2)
AC_CHECK_SIZEOF(long, 4)
AC_CHECK_SIZEOF(void*, 4)
AC_CHECK_SIZEOF(float, 4)
AC_CHECK_SIZEOF(double, 8)

AC_CACHE_CHECK(for prototypes, rb_cv_have_prototypes,
  [AC_TRY_COMPILE([int foo(int x) { return 0; }], [return foo(10);],
	rb_cv_have_prototypes=yes,
	rb_cv_have_prototypes=no)])
if test "$rb_cv_have_prototypes" = yes; then
  AC_DEFINE(HAVE_PROTOTYPES)
fi

AC_CACHE_CHECK(token paste string, rb_cv_tokenpaste,
  [AC_TRY_COMPILE([#define paste(a,b) a##b],
		  [int xy = 1; return paste(x,y);],
		  rb_cv_tokenpaste=ansi,
		  rb_cv_tokenpaste=knr)])
if test "$rb_cv_tokenpaste" = ansi; then
  AC_DEFINE(TOKEN_PASTE(x,y),[x##y])
else
  AC_DEFINE(TOKEN_PASTE(x,y),[x/**/y])
fi

AC_CACHE_CHECK(for variable length prototypes and stdarg.h, rb_cv_stdarg,
  [AC_TRY_COMPILE([
#include <stdarg.h>
int foo(int x, ...) {
	va_list va;
	va_start(va, x);
	va_arg(va, int);
	va_arg(va, char *);
	va_arg(va, double);
	return 0;
}
], [return foo(10, "", 3.14);],
	rb_cv_stdarg=yes,
	rb_cv_stdarg=no)])
if test "$rb_cv_stdarg" = yes; then
  AC_DEFINE(HAVE_STDARG_PROTOTYPES)
fi

AC_CACHE_CHECK(for gcc attribute noreturn, rb_cv_have_attr_noreturn,
  [AC_TRY_COMPILE([void exit(int x) __attribute__ ((noreturn));], [],
	rb_cv_have_attr_noreturn=yes,
	rb_cv_have_attr_noreturn=no)])
if test "$rb_cv_have_attr_noreturn" = yes; then
  AC_DEFINE(HAVE_ATTR_NORETURN)
fi

dnl Checks for libraries.
case "$target_os" in
nextstep*)	;;
openstep*)	;;
rhapsody*)	;;
macos*)	;;
human*)		ac_cv_func_getpgrp_void=yes;;
beos*)		;;
cygwin*)	;;
mingw*)		LIBS="-lwsock32 -lmsvcrt $LIBS"
		ac_cv_header_a_out_h=no
		ac_cv_header_pwd_h=no
		ac_cv_header_utime_h=no
		ac_cv_header_sys_ioctl_h=no
		ac_cv_header_sys_param_h=no
		ac_cv_header_sys_resource_h=no
		ac_cv_header_sys_select_h=no
		ac_cv_header_sys_times_h=no;;
os2_emx*)	LIBS="-lm $LIBS"
		ac_cv_lib_xpg4_setlocale=no
		ac_cv_lib_dir_opendir=no;;
*) LIBS="-lm $LIBS";;
esac
AC_CHECK_LIB(crypt, crypt)
AC_CHECK_LIB(dl, dlopen)	# Dynamic linking for SunOS/Solaris and SYSV
AC_CHECK_LIB(dld, shl_load)	# Dynamic linking for HP-UX
AC_CHECK_LIB(xpg4, setlocale)	# FreeBSD needs this

dnl Checks for header files.
AC_HEADER_DIRENT
AC_HEADER_STDC
AC_HEADER_SYS_WAIT
AC_CHECK_HEADERS(stdlib.h string.h unistd.h limits.h sys/file.h sys/ioctl.h\
		 fcntl.h sys/fcntl.h sys/select.h sys/time.h sys/times.h sys/param.h\
		 syscall.h pwd.h a.out.h utime.h memory.h direct.h sys/resource.h)

dnl Checks for typedefs, structures, and compiler characteristics.
AC_TYPE_UID_T
AC_TYPE_SIZE_T
AC_STRUCT_ST_BLKSIZE
save_LIBOJBS="$LIBOBJS"
AC_STRUCT_ST_BLOCKS
LIBOBJS="$save_LIBOBJS"
AC_STRUCT_ST_RDEV

dnl Checks for library functions.
AC_TYPE_GETGROUPS
AC_TYPE_SIGNAL
AC_FUNC_ALLOCA
AC_FUNC_VFORK
AC_FUNC_MEMCMP
AC_REPLACE_FUNCS(dup2 memmove mkdir strcasecmp strncasecmp strerror strftime\
		 strchr strstr strtoul strdup crypt flock vsnprintf\
		 isinf isnan finite)
AC_CHECK_FUNCS(fmod killpg drand48 random wait4 waitpid syscall getcwd\
	      truncate chsize times utimes fcntl lockf setitimer\
	      setruid seteuid setreuid setrgid setegid setregid\
	      getpgrp setpgrp getpgid setpgid getgroups getpriority\
	      dlopen sigprocmask sigaction _setjmp setsid getrlimit)
AC_STRUCT_TIMEZONE
if test "$ac_cv_func_strftime" = no; then
    AC_TRY_LINK([],
	 [extern int daylight; int i = daylight;], AC_DEFINE(HAVE_DAYLIGHT))
fi

if test "$ac_cv_func_sigprocmask" = yes && test "$ac_cv_func_sigaction" = yes; then
   AC_DEFINE(POSIX_SIGNAL)
else
  AC_CACHE_CHECK(for BSD signal semantics, rb_cv_bsd_signal,
    [AC_TRY_RUN([
#include <stdio.h>
#include <signal.h>

void
sig_handler(dummy)
     int dummy;
{
}

int
main()
{
  signal(SIGINT, sig_handler);
  kill(getpid(), SIGINT);
  kill(getpid(), SIGINT);
  return 0;
}
],
	rb_cv_bsd_signal=yes,
	rb_cv_bsd_signal=no,
	rb_cv_bsd_signal=no)])
  if test "$rb_cv_bsd_signal" = yes; then
    AC_DEFINE(BSD_SIGNAL)
  fi
fi

AC_FUNC_GETPGRP
AC_FUNC_SETPGRP  

AC_CACHE_CHECK(for working strtod, rb_cv_func_strtod,
[AC_TRY_RUN([
double strtod ();
int
main()
{
  {
    /* Some versions of Linux strtod mis-parse strings with leading '+'.  */
    char *string = " +69";
    char *term;
    double value;
    value = strtod(string, &term);
    if (value != 69 || term != (string + 4))
      exit(1);
  }

  {
    /* Under Solaris 2.4, strtod returns the wrong value for the
       terminating character under some conditions.  */
    char *string = "NaN";
    char *term;
    strtod(string, &term);
    if (term != string && *(term - 1) == 0)
      exit(1);
  }
  exit(0);
}
], rb_cv_func_strtod=yes, rb_cv_func_strtod=no, rb_cv_func_strtod=no)])
test $rb_cv_func_strtod = no && LIBOBJS="$LIBOBJS strtod.o"

AC_C_BIGENDIAN
AC_C_CONST
AC_C_CHAR_UNSIGNED

AC_CACHE_CHECK(whether right shift preserve sign bit, rb_cv_rshift_sign,
    [AC_TRY_RUN([
int
main()
{
  if (-1==(-1>>1))
    return 0;
  return 1;
}
],
	rb_cv_rshift_sign=yes,
	rb_cv_rshift_sign=no,
	rb_cv_rshift_sign=yes)])
if test "$rb_cv_rshift_sign" = yes; then
  AC_DEFINE(RSHIFT(x,y), ((x)>>(int)y))
else
  AC_DEFINE(RSHIFT(x,y), (((x)<0) ? ~((~(x))>>y) : (x)>>y))
fi

AC_MSG_CHECKING(count field in FILE structures)
AC_CACHE_VAL(rb_cv_fcnt,
[AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->_cnt = 0;], rb_cv_fcnt="_cnt", )
if test "$rb_cv_fcnt" = ""; then
    AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->__cnt = 0;], rb_cv_fcnt="__cnt", )
fi
if test "$rb_cv_fcnt" = ""; then
    AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->_r = 0;], rb_cv_fcnt="_r", )
fi
if test "$rb_cv_fcnt" = ""; then
    AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->readCount = 0;],
	rb_cv_fcnt="readCount", )
fi
dnl for emx0.9c
if test "$rb_cv_fcnt" = ""; then
    AC_TRY_COMPILE([#include <stdio.h>],
	[FILE *f = stdin; f->_rcount = 0;],
	rb_cv_fcnt="_rcount", rb_cv_fcnt="not found")
fi])
if test "$rb_cv_fcnt" = "not found"; then
  AC_MSG_RESULT([not found(OK if using GNU libc)])
else
  AC_MSG_RESULT($rb_cv_fcnt)
  AC_DEFINE_UNQUOTED(FILE_COUNT, $rb_cv_fcnt)
fi

dnl default value for $KANJI
DEFAULT_KCODE="KCODE_NONE"

AC_ARG_WITH(default-kcode, 
	[--with-default-kcode=CODE specify default value for \$KCODE (utf8|euc|sjis|none)], 
	[case $withval in
	utf8) DEFAULT_KCODE="KCODE_UTF8";;
	euc)  DEFAULT_KCODE="KCODE_EUC";;
	sjis) DEFAULT_KCODE="KCODE_SJIS";;
	none) DEFAULT_KCODE="KCODE_NONE";;
        *)    AC_MSG_WARN($withval is not valid kcode; ignored);;
	esac])
AC_DEFINE_UNQUOTED(DEFAULT_KCODE, $DEFAULT_KCODE)

dnl wheather use dln_a_out ot not
AC_ARG_WITH(dln-a-out, 
	[--with-dln-a-out          use dln_a_out if possible], [
	case $withval in
	yes) with_dln_a_out=yes;;
	*)   with_dln_a_out=no;;
	esac], [with_dln_a_out=no])

AC_SUBST(XLDFLAGS)dnl

AC_CACHE_CHECK(whether ELF binaries are produced, rb_cv_binary_elf,
[AC_TRY_RUN([
/* Test for whether ELF binaries are produced */
#include <fcntl.h>
#include <stdlib.h>
main() {
	char buffer[4];
	int i=open("conftest",O_RDONLY);
	if(i==-1)
		exit(1); /* fail */
	if(read(i,&buffer[0],4)<4)
		exit(1); /* fail */
	if(buffer[0] != 127 || buffer[1] != 'E' ||
           buffer[2] != 'L' || buffer[3] != 'F')
		exit(1); /* fail */
	exit(0); /* succeed (yes, it's ELF) */
}
],
rb_cv_binary_elf=yes,
rb_cv_binary_elf=no,
rb_cv_binary_elf=yes)])

if test "$rb_cv_binary_elf" = yes; then
  AC_DEFINE(USE_ELF)
fi

case "$target_os" in
    linux*)
  if test "$rb_cv_binary_elf" = no; then
    with_dln_a_out=yes
    target_os=${target_os}-a_out
  else
    LDFLAGS="-rdynamic"
  fi;;
netbsd*)
    if [[ "`$CC -dM -E - </dev/null | grep __ELF__`" != "" ]]
    then
	netbsd_elf=yes
    else
	netbsd_elf=no
    fi
    ;;
esac

AC_SUBST(DLDFLAGS)dnl

AC_SUBST(STATIC)dnl
AC_SUBST(CCDLFLAGS)dnl
AC_SUBST(LDSHARED)dnl
AC_SUBST(DLEXT)dnl
AC_SUBST(DLEXT2)dnl

STATIC=

if test "$with_dln_a_out" != yes; then
  rb_cv_dlopen=unknown
  AC_MSG_CHECKING(whether OS depend dynamic link works)
  if test "$GCC" = yes; then
    case "$target_os" in
    nextstep*)	;;
    openstep*)	;;
    rhapsody*)	;;
    macos*)	;;
    human*)	;;
    bsdi*)	;;
    cygwin*)	;;
    mingw*)	;;
    netbsd*) CCDLFLAGS=-fpic
     case "$target_cpu" in
     mips*) CCDLFLAGS=-fPIC ;;
     *) ;;
     esac ;;
    *) CCDLFLAGS=-fPIC;;
    esac
  else
    case "$target_os" in
	hpux*)		CCDLFLAGS='+z';;
	solaris*|irix*)	CCDLFLAGS='-K PIC' ;;
	sunos*)		CCDLFLAGS='-PIC' ;;
	esix*|uxpds*)   CCDLFLAGS='-KPIC' ;;
	*)		CCDLFLAGS='' ;;
    esac
  fi

  case "$target_os" in
	hpux*)		DLDFLAGS="-E"
			LDSHARED='ld -b'
			LDFLAGS="-Wl,-E"
			rb_cv_dlopen=yes;;
	solaris*) 	if test "$GCC" = yes; then
			   LDSHARED='$(CC) -Wl,-G'
			   `$CC --print-prog-name=ld` -v 2>&1 | grep "GNU ld" > /dev/null && LDFLAGS="-Wl,-E"
			else
			   LDSHARED='ld -G'
			fi
			rb_cv_dlopen=yes;;
	sunos*) 	LDSHARED='ld -assert nodefinitions'
			rb_cv_dlopen=yes;;
	irix*) 	 	LDSHARED='ld -ignore_unresolved'
			rb_cv_dlopen=yes;;
	sysv4*) 	LDSHARED='ld -G'
			rb_cv_dlopen=yes;;
	esix*|uxpds*) 	LDSHARED="ld -G"
			rb_cv_dlopen=yes ;;
	osf*) 		LDSHARED="$CC -shared"
			rb_cv_dlopen=yes ;;
	linux*) 	LDSHARED="$CC -shared"
			rb_cv_dlopen=yes ;;
	freebsd*)       LDSHARED="$CC -shared"
			if test "$rb_cv_binary_elf" = yes; then
			    LDFLAGS="-rdynamic"
			    DLDFLAGS='-Wl,-soname,$(.TARGET)'
			else
			  test "$GCC" = yes && `$CC --print-prog-name=ld` -v 2>&1 | grep "GNU ld" > /dev/null || LDSHARED="ld -Bshareable"
			fi
			rb_cv_dlopen=yes ;;
	netbsd*)	LDSHARED="ld -shared"
			if test "$rb_cv_binary_elf" = yes; then
                          LDFLAGS="-export-dynamic"
			fi
			rb_cv_dlopen=yes ;;
	openbsd*) 	LDSHARED="ld -Bforcearchive -Bshareable"
			rb_cv_dlopen=yes ;;
	bsdi3*) 	case "$CC" in
			*shlicc*)	LDSHARED="$CC -r"
					rb_cv_dlopen=yes ;;
			esac ;;
	bsdi*)		LDSHARED="ld -shared"
			LDFLAGS='-rdynamic -Wl,-rpath,$(prefix)/lib/ruby/$(MAJOR).$(MINOR)/i386-bsdi4.0'
			rb_cv_dlopen=yes ;;
	nextstep*)	LDSHARED='cc -r -nostdlib'
			LDFLAGS="-u libsys_s"
			DLDFLAGS="$ARCH_FLAG" 
			rb_cv_dlopen=yes ;;
	openstep*)	LDSHARED='cc -dynamic -bundle -undefined suppress'
			LDFLAGS=""
			DLDFLAGS="$ARCH_FLAG"
			rb_cv_dlopen=yes ;;
	rhapsody*)	LDSHARED='cc -dynamic -bundle -undefined suppress'
			LDFLAGS=""
			DLDFLAGS="$ARCH_FLAG"
			rb_cv_dlopen=yes ;;
	macos*)		LDSHARED='cc -dynamic -bundle -undefined suppress'
			LDFLAGS=""
			DLDFLAGS="$ARCH_FLAG"
			rb_cv_dlopen=yes ;;
	aix*)		LDSHARED='/usr/ccs/bin/ld'
			XLDFLAGS='-Wl,-bE:ruby.imp'
			DLDFLAGS='-eInit_$(TARGET) -bI:$(topdir)/ruby.imp -bM:SRE -T512 -H512 -lc'
			LDFLAGS="-brtl"
			rb_cv_dlopen=yes ;;

	human*)		DLDFLAGS=''
			LDSHARED=''
			LDFLAGS=''
			rb_cv_dlopen=yes ;;
	beos*) 		case "$target_cpu" in
			  powerpc*)
			    LDSHARED="ld -xms"
			    DLDFLAGS="-f ruby.exp -lbe -lroot glue-noinit.a init_term_dyn.o start_dyn.o"
                            ;;
			  i586*)
			    LDSHARED="ld -shared"
			    DLDFLAGS="-L/boot/develop/lib/x86 -lbe -lroot"
			    ;;
			  *)
			    DLDFLAGS="ruby.def -lbe -lroot glue-noinit.a init_term_dyn.o start_dyn.o"
			esac
			rb_cv_dlopen=yes ;;
	cygwin*|mingw*)	: ${LDSHARED="${DLLWRAP} --target=${target_os} --as=${AS} --dlltool-name=${DLLTOOL} --driver-name=${CC} --export-all -s"}
			rb_cv_dlopen=yes ;;
	*) 		LDSHARED='ld' ;;
  esac
  AC_MSG_RESULT($rb_cv_dlopen)
fi

dln_a_out_works=no
if test "$ac_cv_header_a_out_h" = yes; then
  if test "$with_dln_a_out" = yes || test "$rb_cv_dlopen" = unknown; then
    cat confdefs.h > config.h
    AC_CACHE_CHECK(whether matz's dln works, rb_cv_dln_a_out,
    [AC_TRY_COMPILE([
#define USE_DLN_A_OUT
#include "dln.c"
],
	[], 
	rb_cv_dln_a_out=yes,
	rb_cv_dln_a_out=no)])
    if test "$rb_cv_dln_a_out" = yes; then
      dln_a_out_works=yes
      AC_DEFINE(USE_DLN_A_OUT)
    fi
  fi
fi

if test "$dln_a_out_works" = yes; then
  if test "$GCC" = yes; then
    STATIC=-static
  else
    STATIC=-Bstatic
  fi
  DLEXT=so
  AC_DEFINE(DLEXT, ".so")
  CCDLFLAGS=
else
  case "$target_os" in
    hpux*)	DLEXT=sl
	 	AC_DEFINE(DLEXT, ".sl");;
    nextstep*)	DLEXT=bundle
	 	AC_DEFINE(DLEXT, ".bundle");;
    openstep*)	DLEXT=bundle
	 	AC_DEFINE(DLEXT, ".bundle");;
    rhapsody*)	DLEXT=bundle
	 	AC_DEFINE(DLEXT, ".bundle");;
    macos*)	DLEXT=bundle
	 	AC_DEFINE(DLEXT, ".bundle");;
    os2_emx*)	DLEXT=dll
	 	AC_DEFINE(DLEXT, ".dll");;
    cygwin*|mingw*)	DLEXT=so
	 	AC_DEFINE(DLEXT, ".so")
		DLEXT2=dll
	 	AC_DEFINE(DLEXT2, ".dll");;
    *)		DLEXT=so
    		AC_DEFINE(DLEXT, ".so");;
  esac
fi

AC_SUBST(STRIP)dnl
if test "$with_dln_a_out" = yes; then
  STRIP=true
else
  STRIP=strip
fi

case "$target_os" in
  linux*)
	STRIP='strip -S -x';;
  nextstep*)
	STRIP='strip -A -n';;
  openstep*)
	STRIP='strip -A -n';;
  rhapsody*)
	STRIP='strip -A -n';;
  macos*)
	STRIP='strip -A -n';;
esac

EXTSTATIC=
AC_SUBST(EXTSTATIC)dnl
AC_ARG_WITH(static-linked-ext,
	    [--with-static-linked-ext  link external modules statically],
            [case $withval in
	     yes) STATIC=
		  EXTSTATIC=static;;
	     *)	;;
	     esac])

case "$target_os" in
  human*)
    AC_CHECK_LIB(signal, _harderr)
    AC_CHECK_LIB(hmem, hmemset)
    AC_CHECK_FUNCS(select gettimeofday)
    AC_CACHE_CHECK(whether PD libc _dtos18 fail to convert big number,
		   rb_cv_missing__dtos18,
    [AC_TRY_RUN(
changequote(<<, >>)dnl
<<
#include <stdio.h>
main ()
{
   char buf[256];
   sprintf (buf, "%g", 1e+300);
   exit (strcmp (buf, "1e+300") ? 0 : 1);
}
>>,
changequote([, ])dnl
rb_cv_missing__dtos18=yes, rb_cv_missing__dtos18=no, rb_cv_missing__dtos18=no)])
    if test "$rb_cv_missing__dtos18" = yes; then
      AC_DEFINE(MISSING__DTOS18)
    fi
    AC_CACHE_CHECK(whether PD libc fconvert fail to round,
		   rb_cv_missing_fconvert,
    [AC_TRY_RUN(
changequote(<<, >>)dnl
<<
#include <stdio.h>
#include <math.h>
main ()
{
  char buf[256];
  sprintf (buf, "%f", log(exp(1.0)));
  exit (strcmp (buf, "1.000000") ? 0 : 1);
}
>>,
changequote([, ])dnl
rb_cv_missing_fconvert=yes, rb_cv_missing_fconvert=no, rb_cv_missing_fconvert=no)])
    if test "$rb_cv_missing_fconvert" = yes; then
      AC_DEFINE(MISSING_FCONVERT)
    fi
    LIBOBJS="$LIBOBJS x68.o"
    CFLAGS="$CFLAGS -fansi-only -cc1-stack=262144 -cpp-stack=2694144"
    EXEEXT=.x
    OBJEXT=o
    setup=Setup.x68
    ;;
  dnl OS/2 environment w/ Autoconf 2.1x for EMX
  os2_emx)
    LIBOBJS="$LIBOBJS os2.$OBJEXT"
    setup=Setup.emx
    ;;
  *djgpp*)
    setup=Setup.dj
    ;;
  *)
    setup=Setup
    ;;
esac

AC_SUBST(setup)

if test "$prefix" = NONE; then
  prefix=$ac_default_prefix
fi

if test "$fat_binary" = yes ; then
  CFLAGS="$CFLAGS $ARCH_FLAG"
fi

if test x"$cross_compiling" = xyes; then
  MINIRUBY="ruby -I`pwd` -rfake"
  PREP=fake.rb
else
  MINIRUBY='./miniruby$(EXEEXT)'
  PREP=''
fi
AC_SUBST(MINIRUBY)
AC_SUBST(PREP)

FIRSTMAKEFILE=""
LIBRUBY_A='lib$(RUBY_INSTALL_NAME).a'
LIBRUBY='$(LIBRUBY_A)'
LIBRUBYARG='$(LIBRUBY_A)'
SOLIBS=
if test "$target_os" = "beos"; then
  LIBRUBY='$(LIBRUBY_SO)'
  LIBRUBYARG='-l$(RUBY_INSTALL_NAME)'
  SOLIBS='-lnet'
  echo creating ruby.def
  case "$target_cpu" in
    powerpc*)
      cp beos/ruby.def.in ruby.exp
      CFLAGS="$CFLAGS -relax_pointers"
      ;;
    i586*)
      LDFLAGS="$LDFLAGS -L."
      ;;
    *)
      echo EXPORTS > ruby.def
      cat beos/ruby.def.in >> ruby.def
      ;;
  esac
fi

case "$target_os" in
  cygwin*|mingw*|beos*|openstep*|nextstep*|rhapsody*|macos*|os2_emx*)
    DLDLIBS=""
    ;;
  *)
    DLDLIBS="-lc"
    ;;
esac

LIBRUBY_LDSHARED=$LDSHARED
LIBRUBY_DLDFLAGS=$DLDFLAGS
LIBRUBY_SO='lib$(RUBY_INSTALL_NAME).so.$(MAJOR).$(MINOR).$(TEENY)'
LIBRUBY_ALIASES='lib$(RUBY_INSTALL_NAME).so'
AC_ARG_ENABLE(enable-shared,
       [--enable-shared           build a shared library for Ruby. ],
       [enable_shared=$enableval])
if test "$enable_shared" = 'yes'; then
  LIBRUBY='$(LIBRUBY_SO)'
  LIBRUBYARG='-L. -l$(RUBY_INSTALL_NAME)'
  CFLAGS="$CFLAGS $CCDLFLAGS"
  case "$target_os" in
    sunos4*)
	LIBRUBY_ALIASES='lib$(RUBY_INSTALL_NAME).so.$(MAJOR).$(MINOR) lib$(RUBY_INSTALL_NAME).so'
	;;
    linux*)
	LIBRUBY_DLDFLAGS='-Wl,-soname,lib$(RUBY_INSTALL_NAME).so.$(MAJOR).$(MINOR)'
	LIBRUBY_ALIASES='lib$(RUBY_INSTALL_NAME).so.$(MAJOR).$(MINOR) lib$(RUBY_INSTALL_NAME).so'
	;;
    freebsd*)
	LIBRUBY_SO='lib$(RUBY_INSTALL_NAME).so.$(MAJOR)$(MINOR)'
	if test "$rb_cv_binary_elf" != "yes" ; then
	    LIBRUBY_SO="$LIBRUBY_SO.\$(TEENY)"
	    LIBRUBY_ALIASES=''
	fi
	;;
    netbsd*)
	LIBRUBY_SO='lib$(RUBY_INSTALL_NAME).so.$(MAJOR).$(MINOR)'
	if test "$rb_cv_binary_elf" = yes; then # ELF platforms
	   LIBRUBY_ALIASES='lib$(RUBY_INSTALL_NAME).so.$(MAJOR) lib$(RUBY_INSTALL_NAME).so'
	else
	   LIBRUBY_ALIASES=  # a.out platforms
	fi
 	;;
    solaris*)
	XLDFLAGS='-R${prefix}/lib'
 	;;
    hpux*)
	XLDFLAGS='-Wl,+s,+b,$(prefix)/lib'
	LIBRUBY_SO='lib$(RUBY_INSTALL_NAME).sl.$(MAJOR).$(MINOR).$(TEENY)'
	LIBRUBY_ALIASES='lib$(RUBY_INSTALL_NAME).sl.$(MAJOR).$(MINOR) lib$(RUBY_INSTALL_NAME).sl'
	;;
    aix*)
	if test "$GCC" = yes; then
	    LIBRUBY_LDSHARED='$(CC) -shared'
	    LIBRUBY_DLDFLAGS='-Wl,-bE:ruby.imp'
	else
	    LIBRUBY_LDSHARED='/usr/ccs/bin/ld'
	    LIBRUBY_DLDFLAGS='-bE:ruby.imp -bM:SRE -bnoentry'
	fi
	LIBRUBYARG='-L${prefix}/lib -Wl,lib$(RUBY_INSTALL_NAME).so'
	SOLIBS='-lm -lc'
	;;
    cygwin*|mingw*)
	LIBRUBY_SO='lib$(RUBY_INSTALL_NAME).a'
	LIBRUBY_ALIASES=''
	LIBRUBY_A='lib$(RUBY_INSTALL_NAME)s.a'
	LIBRUBYARG='-L. -l$(RUBY_INSTALL_NAME)'
	FIRSTMAKEFILE=GNUmakefile:cygwin/GNUmakefile.in
	case "$target_os" in
	cygwin*)
	    CCDLFLAGS=-DUSEIMPORTLIB ;;
	mingw*)
	    CCDLFLAGS=-DIMPORT
	    SOLIBS='-lwsock32 -lmsvcrt' ;;
	esac
	;;
    *)
	;;
  esac
fi

case "$target_os" in
    nextstep*)
    	CFLAGS="$CFLAGS -pipe"
	;;
    openstep*)
    	CFLAGS="$CFLAGS -pipe"
	;;
    rhasody*)
    	CFLAGS="$CFLAGS -pipe -no-precomp"
	;;
    osf*)
	if test "$without_gcc" = "no" ; then
	  CFLAGS="$CFLAGS -ansi"
	else
	  # compile something small: taint.c is fine for this.
	  # the main point is the '-v' flag of 'cc'.
	  case "`cc -v -I. -c main.c -o /tmp/main.o 2>&1`" in
	  */gemc_cc*)   # we have the new DEC GEM CC
                        CFLAGS="$CFLAGS -oldc"
                        ;;
          *)            # we have the old MIPS CC
                        ;;
          esac
	  # cleanup
	  rm -f /tmp/main.o
	  CFLAGS="$CFLAGS -std"
	fi
		;;
    cygwin*)
	LIBOBJS="$LIBOBJS strftime.o"
	;;
    mingw*)
	LIBOBJS="$LIBOBJS win32.o"
	CFLAGS="-DNT -D__MSVCRT__ $CFLAGS"
	;;
    *)
	;;	
esac

AC_SUBST(LIBRUBY_LDSHARED)
AC_SUBST(LIBRUBY_DLDFLAGS)
AC_SUBST(RUBY_INSTALL_NAME)
AC_SUBST(LIBRUBY_A)
AC_SUBST(LIBRUBY_SO)
AC_SUBST(LIBRUBY_ALIASES)
AC_SUBST(LIBRUBY)
AC_SUBST(LIBRUBYARG)
AC_SUBST(SOLIBS)
AC_SUBST(DLDLIBS)

ri_prefix=
test "$program_prefix" != NONE &&
  ri_prefix=$program_prefix

ri_suffix=
test "$program_suffix" != NONE &&
  ri_suffix=$program_suffix

RUBY_INSTALL_NAME="${ri_prefix}ruby${ri_suffix}"
RUBY_LIB_PREFIX="${prefix}/lib/ruby"
RUBY_LIB_PATH="${RUBY_LIB_PREFIX}/${MAJOR}.${MINOR}"
sitedir="${prefix}/lib/ruby/site_ruby"
AC_ARG_WITH(sitedir,
	    [--with-sitedir=DIR        site libraries in DIR [PREFIX/lib/ruby/site_ruby]],
            [sitedir=$withval])
RUBY_SITE_LIB_PATH="${sitedir}"
RUBY_SITE_LIB_PATH2="${sitedir}/${MAJOR}.${MINOR}"

AC_DEFINE_UNQUOTED(RUBY_LIB, "${RUBY_LIB_PATH}")
AC_DEFINE_UNQUOTED(RUBY_SITE_LIB, "${RUBY_SITE_LIB_PATH}")
AC_DEFINE_UNQUOTED(RUBY_SITE_LIB2, "${RUBY_SITE_LIB_PATH2}")

AC_SUBST(arch)dnl
AC_SUBST(sitedir)dnl

configure_args=$ac_configure_args
AC_SUBST(configure_args)dnl

if test "$fat_binary" = yes ; then
    arch="fat-${target_os}"

    AC_DEFINE_UNQUOTED(RUBY_THIN_ARCHLIB,
                 "${RUBY_LIB_PATH}/" __ARCHITECTURE__ "-${target_os}")

    AC_DEFINE_UNQUOTED(RUBY_SITE_THIN_ARCHLIB,
                 "${RUBY_SITE_LIB_PATH}/" __ARCHITECTURE__ "-${target_os}")
    AC_DEFINE_UNQUOTED(RUBY_PLATFORM, __ARCHITECTURE__ "-${target_os}")
else
    arch="${target_cpu}-${target_os}"
    AC_DEFINE_UNQUOTED(RUBY_PLATFORM, "${arch}")
fi

AC_DEFINE_UNQUOTED(RUBY_ARCHLIB, "${RUBY_LIB_PATH}/${arch}")
AC_DEFINE_UNQUOTED(RUBY_SITE_ARCHLIB, "${RUBY_SITE_LIB_PATH2}/${arch}")

AC_ARG_WITH(search-path,
		[--with-search-path	  specify the additional search path],
		[search_path=$withval])
if test "$search_path" != ""; then
    AC_DEFINE_UNQUOTED(RUBY_SEARCH_PATH,"$search_path")
fi

echo "creating config.h"
tr -d '\015' < confdefs.h > config.h

AC_OUTPUT($FIRSTMAKEFILE Makefile ext/extmk.rb)