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AC_INIT(nix, m4_esyscmd([echo -n $(cat ./version)$VERSION_SUFFIX]))
AC_CONFIG_SRCDIR(README)
AC_CONFIG_AUX_DIR(config)
AM_INIT_AUTOMAKE([dist-bzip2 foreign])

AC_DEFINE_UNQUOTED(NIX_VERSION, ["$VERSION"], [Nix version.])

AC_CANONICAL_HOST


# Construct a Nix system name (like "i686-linux").
AC_MSG_CHECKING([for the canonical Nix system name])
cpu_name=$(uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ ' 'abcdefghijklmnopqrstuvwxyz_')
machine_name=$(uname -m | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ ' 'abcdefghijklmnopqrstuvwxyz_')

case $machine_name in
    i*86)
        machine_name=i686
        ;;
    x86_64)
        machine_name=x86_64
        ;;
    ppc)
        machine_name=powerpc
        ;;
    *)
        if test "$cpu_name" != "unknown"; then
            machine_name=$cpu_name
        fi
        ;;
esac

sys_name=$(uname -s | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ ' 'abcdefghijklmnopqrstuvwxyz_')

case $sys_name in
    cygwin*)
        sys_name=cygwin
        ;;
esac

AC_ARG_WITH(system, AC_HELP_STRING([--with-system=SYSTEM],
  [Platform identifier (e.g., `i686-linux').]),
  system=$withval, system="${machine_name}-${sys_name}")
AC_MSG_RESULT($system)
AC_SUBST(system)
AC_DEFINE_UNQUOTED(SYSTEM, ["$system"], [platform identifier (`cpu-os')])


# State should be stored in /nix/var, unless the user overrides it explicitly.
test "$localstatedir" = '${prefix}/var' && localstatedir=/nix/var


# Windows-specific stuff.  On Cygwin, dynamically linking against the
# ATerm DLL works, except that it requires the ATerm "lib" directory
# to be in $PATH, as Windows doesn't have anything like an RPATH
# embedded in executable.  Since this is kind of annoying, we use
# static libraries for now.
if test "$sys_name" = "cygwin"; then
    AC_DISABLE_SHARED
    AC_ENABLE_STATIC
fi


# Solaris-specific stuff.
if test "$sys_name" = "sunos"; then
    # Solaris requires -lsocket -lnsl for network functions
    LIBS="-lsocket -lnsl $LIBS"
fi


AC_PROG_CC
AC_PROG_CXX

# To build programs to be run in the build machine
if test "$CC_FOR_BUILD" = ""; then
    if test "$cross_compiling" = "yes"; then
        AC_CHECK_PROGS(CC_FOR_BUILD, gcc cc)
    else
        CC_FOR_BUILD="$CC"
    fi
fi
AC_SUBST([CC_FOR_BUILD])

# We are going to use libtool.
AC_DISABLE_STATIC
AC_ENABLE_SHARED
AC_PROG_LIBTOOL

if test "$enable_shared" = yes; then
   SUB_CONFIGURE_FLAGS="--enable-shared --disable-static"
else
   SUB_CONFIGURE_FLAGS="--enable-static --disable-shared"
fi
AC_SUBST(SUB_CONFIGURE_FLAGS)


# Use 64-bit file system calls so that we can support files > 2 GiB.
AC_SYS_LARGEFILE


# Check for pubsetbuf.
AC_MSG_CHECKING([for pubsetbuf])
AC_LANG_PUSH(C++)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <iostream>
using namespace std;
static char buf[1024];]],
    [[cerr.rdbuf()->pubsetbuf(buf, sizeof(buf));]])],
    [AC_MSG_RESULT(yes) AC_DEFINE(HAVE_PUBSETBUF, 1, [Whether pubsetbuf is available.])],
    AC_MSG_RESULT(no))
AC_LANG_POP(C++)


# Check for chroot support (requires chroot() and bind mounts).
AC_CHECK_FUNCS([chroot])
AC_CHECK_FUNCS([unshare])
AC_CHECK_HEADERS([sched.h], [], [], [])
AC_CHECK_HEADERS([sys/param.h], [], [], [])
AC_CHECK_HEADERS([sys/mount.h], [], [],
[#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
])


# Check for <locale>.
AC_LANG_PUSH(C++)
AC_CHECK_HEADERS([locale], [], [], [])
AC_LANG_POP(C++)


# Check for <err.h>.
AC_CHECK_HEADER([err.h], [], [bsddiff_compat_include="-Icompat-include"])
AC_SUBST([bsddiff_compat_include])


# Check whether we have the personality() syscall, which allows us to
# do i686-linux builds on x86_64-linux machines.
AC_CHECK_HEADERS([sys/personality.h])


# Check for tr1/unordered_set.
AC_LANG_PUSH(C++)
AC_CHECK_HEADERS([tr1/unordered_set], [], [], [])
AC_LANG_POP(C++)


AC_DEFUN([NEED_PROG],
[
AC_PATH_PROG($1, $2)
if test -z "$$1"; then
    AC_MSG_ERROR([$2 is required])
fi
])

NEED_PROG(curl, curl)
NEED_PROG(bash, bash)
NEED_PROG(patch, patch)
AC_PATH_PROG(xmllint, xmllint, false)
AC_PATH_PROG(xsltproc, xsltproc, false)
AC_PATH_PROG(w3m, w3m, false)
AC_PATH_PROG(flex, flex, false)
AC_PATH_PROG(bison, bison, false)
NEED_PROG(perl, perl)
NEED_PROG(sed, sed)
NEED_PROG(tar, tar)
AC_PATH_PROG(dot, dot)
AC_PATH_PROG(dblatex, dblatex)
AC_PATH_PROG(gzip, gzip)

AC_PATH_PROG(openssl_prog, openssl, openssl) # if not found, call openssl in $PATH
AC_SUBST(openssl_prog)
AC_DEFINE_UNQUOTED(OPENSSL_PATH, ["$openssl_prog"], [Path of the OpenSSL binary])

# Test that Perl has the open/fork feature (Perl 5.8.0 and beyond).
AC_MSG_CHECKING([whether Perl is recent enough])
if ! $perl -e 'open(FOO, "-|", "true"); while (<FOO>) { print; }; close FOO or die;'; then
    AC_MSG_RESULT(no)
    AC_MSG_ERROR([Your Perl version is too old.  Nix requires Perl 5.8.0 or newer.])
fi
AC_MSG_RESULT(yes)

NEED_PROG(cat, cat)
NEED_PROG(tr, tr)
AC_ARG_WITH(coreutils-bin, AC_HELP_STRING([--with-coreutils-bin=PATH],
  [path of cat, mkdir, etc.]),
  coreutils=$withval, coreutils=$(dirname $cat))
AC_SUBST(coreutils)

AC_ARG_WITH(docbook-rng, AC_HELP_STRING([--with-docbook-rng=PATH],
  [path of the DocBook RelaxNG schema]),
  docbookrng=$withval, docbookrng=/docbook-rng-missing)
AC_SUBST(docbookrng)

AC_ARG_WITH(docbook-xsl, AC_HELP_STRING([--with-docbook-xsl=PATH],
  [path of the DocBook XSL stylesheets]),
  docbookxsl=$withval, docbookxsl=/docbook-xsl-missing)
AC_SUBST(docbookxsl)

AC_ARG_WITH(xml-flags, AC_HELP_STRING([--with-xml-flags=FLAGS],
  [extra flags to be passed to xmllint and xsltproc]),
  xmlflags=$withval, xmlflags=)
AC_SUBST(xmlflags)

AC_ARG_WITH(store-dir, AC_HELP_STRING([--with-store-dir=PATH],
  [path of the Nix store]),
  storedir=$withval, storedir='/nix/store')
AC_SUBST(storedir)

AC_ARG_WITH(openssl, AC_HELP_STRING([--with-openssl=PATH],
  [prefix of the OpenSSL library]),
  openssl=$withval, openssl=)
AM_CONDITIONAL(HAVE_OPENSSL, test -n "$openssl")
if test -n "$openssl"; then
  LDFLAGS="-L$openssl/lib -lcrypto $LDFLAGS"
  CFLAGS="-I$openssl/include $CFLAGS"
  CXXFLAGS="-I$openssl/include $CXXFLAGS"
  AC_DEFINE(HAVE_OPENSSL, 1, [Whether to use OpenSSL.])
fi

AC_ARG_WITH(bzip2, AC_HELP_STRING([--with-bzip2=PATH],
  [prefix of bzip2]),
  bzip2=$withval, bzip2=)
AM_CONDITIONAL(HAVE_BZIP2, test -n "$bzip2")
ATERM_VERSION=2.5
AC_SUBST(ATERM_VERSION)
if test -z "$bzip2"; then
  # Headers and libraries will be used from the temporary installation
  # in externals/inst-bzip2.
  bzip2_lib='-L${top_builddir}/externals/inst-bzip2/lib -lbz2'
  bzip2_include='-I${top_builddir}/externals/inst-bzip2/include'
  # The binary will be copied to $libexecdir.
  bzip2_bin='${libexecdir}/nix'
  # But for testing, we have to use the temporary copy :-(
  bzip2_bin_test='${top_builddir}/externals/inst-bzip2/bin'
else
  bzip2_lib="-L$bzip2/lib -lbz2"
  bzip2_include="-I$bzip2/include"
  bzip2_bin="$bzip2/bin"
  bzip2_bin_test="$bzip2/bin"
fi
AC_SUBST(bzip2_lib)
AC_SUBST(bzip2_include)
AC_SUBST(bzip2_bin)
AC_SUBST(bzip2_bin_test)

AC_ARG_WITH(sqlite, AC_HELP_STRING([--with-sqlite=PATH],
  [prefix of SQLite]),
  sqlite=$withval, sqlite=)
AM_CONDITIONAL(HAVE_SQLITE, test -n "$sqlite")
SQLITE_VERSION=3070400
AC_SUBST(SQLITE_VERSION)
if test -z "$sqlite"; then
  sqlite_lib='${top_builddir}/externals/sqlite-autoconf-$(SQLITE_VERSION)/libsqlite3.la'
  sqlite_include='-I${top_builddir}/externals/sqlite-autoconf-$(SQLITE_VERSION)'
  sqlite_bin='${top_builddir}/externals/sqlite-autoconf-$(SQLITE_VERSION)'
else
  sqlite_lib="-L$sqlite/lib -lsqlite3"
  sqlite_include="-I$sqlite/include"
  sqlite_bin="$sqlite/bin"
fi
AC_SUBST(sqlite_lib)
AC_SUBST(sqlite_include)
AC_SUBST(sqlite_bin)

# Whether to use the Boehm garbage collector.
AC_ARG_ENABLE(gc, AC_HELP_STRING([--enable-gc],
  [enable garbage collection in the Nix expression evaluator (requires Boehm GC)]),
  gc=$enableval, gc=)
if test -n "$gc"; then
  PKG_CHECK_MODULES([BDW_GC], [bdw-gc])
  boehmgc_lib="-L$boehmgc/lib -lgc"
  CXXFLAGS="$BDW_GC_CFLAGS $CXXFLAGS"
  AC_DEFINE(HAVE_BOEHMGC, 1, [Whether to use the Boehm garbage collector.])
fi
AC_SUBST(boehmgc_lib)


AC_ARG_ENABLE(init-state, AC_HELP_STRING([--disable-init-state],
  [do not initialise DB etc. in `make install']),
  init_state=$enableval, init_state=yes)
AM_CONDITIONAL(INIT_STATE, test "$init_state" = "yes")


# Setuid installations.
AC_CHECK_FUNCS([setresuid setreuid lchown])


# Nice to have, but not essential.
AC_CHECK_FUNCS([strsignal posix_fallocate nanosleep])


# This is needed if ATerm or bzip2 are static libraries,
# and the Nix libraries are dynamic.
if test "$(uname)" = "Darwin"; then
    LDFLAGS="-all_load $LDFLAGS"
fi


AM_CONFIG_HEADER([config.h])
AC_CONFIG_FILES([Makefile
   externals/Makefile
   src/Makefile
   src/bin2c/Makefile
   src/boost/Makefile
   src/boost/format/Makefile
   src/libutil/Makefile
   src/libstore/Makefile
   src/libmain/Makefile
   src/nix-store/Makefile
   src/nix-hash/Makefile
   src/libexpr/Makefile
   src/nix-instantiate/Makefile
   src/nix-env/Makefile
   src/nix-worker/Makefile
   src/nix-setuid-helper/Makefile
   src/nix-log2xml/Makefile
   src/bsdiff-4.3/Makefile
   scripts/Makefile
   corepkgs/Makefile
   corepkgs/nar/Makefile
   corepkgs/buildenv/Makefile
   corepkgs/channels/Makefile
   doc/Makefile
   doc/manual/Makefile
   misc/Makefile
   misc/emacs/Makefile
   tests/Makefile
  ])
AC_OUTPUT