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
AC_CANONICAL_BUILD

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
	;;
    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
	# to ensure AC_HEADER_SYS_WAIT works
	AC_DEFINE(_POSIX_SOURCE)
        ;;
    darwin*)
        echo -n "MacOS X (Darwin): "
   	        TARGET_ARCHS="ppc"
	;;
    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)
	AC_CHECK_TOOL(WINDRES, windres)
	;;
esac

AC_PROG_LN_S
AC_PROG_MAKE_SET

# checks for UNIX variants that set C preprocessor variables
AC_AIX
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*)	;;
darwin*)	;;
human*)		ac_cv_func_getpgrp_void=yes;;
beos*)		;;
cygwin*)	rb_cv_have_daylight=no;;
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
		ac_cv_func_times=yes;;
os2_emx*)	LIBS="-lm $LIBS"
		ac_cv_lib_dir_opendir=no;;
freebsd*)	LIBS="-lm $LIBS"
		AC_CACHE_CHECK([whether -lxpg4 has to be linked],
		  rb_cv_lib_xpg4_needed,
		  [AC_TRY_CPP([
#include <osreldate.h>
#if __FreeBSD_version < 400020 || \
   (__FreeBSD_version >= 500000 && __FreeBSD_version < 500005)
#error needs libxpg4
#endif
		   ],
		   rb_cv_lib_xpg4_needed=no,
		   rb_cv_lib_xpg4_needed=yes,
		   rb_cv_lib_xpg4_needed=yes)])
		if test "$rb_cv_lib_xpg4_needed" = yes; then
			AC_CHECK_LIB(xpg4, setlocale)
		fi
		;;
*) 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

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 crypt flock vsnprintf\
		 isinf isnan finite)
AC_CHECK_FUNCS(fmod killpg drand48 random wait4 waitpid syscall getcwd chroot\
	      truncate chsize times utimes fcntl lockf setitimer pause\
	      setruid seteuid setreuid setrgid setegid setregid\
	      getpgrp setpgrp getpgid setpgid getgroups getpriority\
	      dlopen sigprocmask sigaction _setjmp setsid getrlimit)
AC_STRUCT_TIMEZONE
AC_CACHE_CHECK(for external int daylight, rb_cv_have_daylight,
  [AC_TRY_LINK([#include <time.h>
  int i;],
  	[i = daylight;],
	rb_cv_have_daylight=yes,
	rb_cv_have_daylight=no)])
if test "$rb_cv_have_daylight" = yes; then
  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 "$target_os" in
    nextstep*)	;;
    openstep*)	;;
    rhapsody*)	;;
    darwin*)	;;
    human*)	;;
    bsdi*)	;;
    beos*)	;;
    cygwin*)	;;
    mingw*)	;;
    netbsd*) CCDLFLAGS=-fpic
     case "$target_cpu" in
     mips*) CCDLFLAGS=-fPIC ;;
     sparc) CCDLFLAGS=-fPIC ;;
     *) ;;
     esac ;;
    *) CCDLFLAGS=-fPIC;;
    esac
  else
    case "$target_os" in
	hpux*)		CCDLFLAGS='+z';;
	solaris*|irix*)	CCDLFLAGS='-KPIC' ;;
	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 -shared'
			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 ;;
	darwin*)	LDSHARED='cc -dynamic -bundle -undefined suppress'
			LDFLAGS=""
			DLDFLAGS="$ARCH_FLAG"
			rb_cv_dlopen=yes ;;
	aix*)		LDSHARED='/usr/ccs/bin/ld'
			XLDFLAGS='-Wl,-bE:ruby.imp'
			DLDFLAGS='-brtl -eInit_$(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 "$target_cpu" in
			  powerpc*)
			    LDSHARED="ld -xms"
			    DLDFLAGS='-export Init_$(TARGET) -lbe -lroot glue-noinit.a init_term_dyn.o start_dyn.o'
                            ;;
			  i586*)
			    LDSHARED="ld -shared"
			    DLDFLAGS="-L/boot/develop/lib/x86 -lbe -lroot"
			    ;;
			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");;
    darwin*)	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';;
  darwin*)
	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=

case "$target_os" in
  cygwin*|mingw*|beos*|openstep*|nextstep*|rhapsody*|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'
ENABLE_SHARED=no

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 $CCDLFLAGS"
  ENABLE_SHARED=yes
  case "$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$(RUBY_INSTALL_NAME).so'
	SOLIBS='-lm -lc'
	;;
    beos*)
	case "$target_cpu" in
	powerpc*)
	    LIBRUBY_DLDFLAGS='-f ruby.exp -lnet -lbe -lroot glue-noinit.a init_term_dyn.o start_dyn.o'
	    ;;
	esac
	;;
    *)
	;;
  esac
fi

case "$target_os" in
    nextstep*)
    	CFLAGS="$CFLAGS -pipe"
	;;
    openstep*)
    	CFLAGS="$CFLAGS -pipe"
	;;
    rhapsody*)
    	CFLAGS="$CFLAGS -pipe -no-precomp"
	;;
    darwin*)
    	CFLAGS="$CFLAGS -pipe -no-precomp"
	;;
    os2_emx)
    	CFLAGS="$CFLAGS -DOS2"
	;;
    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
		;;
    beos*)
	case "$target_cpu" in
	powerpc*)
	    CFLAGS="$CFLAGS -relax_pointers"
	    ;;
	esac
	;;
    cygwin*|mingw*)
	if test x"$enable_shared" = xyes; then
	    LIBRUBY_SO='$(RUBY_INSTALL_NAME).'$target_os.dll
	    LIBRUBY_DLDFLAGS='--dllname=$@ --output-lib=$(LIBRUBY) --add-stdcall-alias --def=$(RUBYDEF)'
	else
	    LIBRUBY_SO=dummy
	    LIBRUBY_DLDFLAGS='--output-exp=$(RUBY_INSTALL_NAME).exp --dllname=$(RUBY_INSTALL_NAME)$(EXEEXT) --output-lib=$(LIBRUBY) --add-stdcall-alias --def=$(RUBYDEF)'
	fi
	LIBRUBY_ALIASES=''
	LIBRUBY_A='lib$(RUBY_INSTALL_NAME)s.a'
	LIBRUBY='lib$(RUBY_INSTALL_NAME).a'
	LIBRUBYARG='-L. -l$(RUBY_INSTALL_NAME)'
	FIRSTMAKEFILE=GNUmakefile:cygwin/GNUmakefile.in
	SOLIBS='$(LIBS)'
	case "$target_os" in
	cygwin*)
	    LIBOBJS="$LIBOBJS strftime.o"
	    CCDLFLAGS=-DUSEIMPORTLIB ;;
	mingw*)
	    LIBOBJS="$LIBOBJS win32.o"
	    CFLAGS="-DNT -D__MSVCRT__ $CFLAGS"
	    CCDLFLAGS=-DIMPORT ;;
	esac
	;;
    *)
	;;	
esac

AC_SUBST(LIBRUBY_LDSHARED)
AC_SUBST(LIBRUBY_DLDFLAGS)
AC_SUBST(RUBY_INSTALL_NAME)
AC_SUBST(RUBY_SO_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)
AC_SUBST(ENABLE_SHARED)

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}"
case "$target_os" in
  cygwin*|mingw*|*djgpp*)
    RUBY_LIB_PREFIX="/lib/ruby"
    SITEDIR='/lib/ruby/site_ruby'
    ;;
  *)
    RUBY_LIB_PREFIX="${prefix}/lib/ruby"
    SITEDIR='${prefix}/lib/ruby/site_ruby'
    ;;
esac
RUBY_LIB_PATH="${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=`eval "echo ${SITEDIR}"`
RUBY_SITE_LIB_PATH2="${RUBY_SITE_LIB_PATH}/${MAJOR}.${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)