configure.ac - git - Git at Google

 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.

 AC_PREREQ(2.59)
 AC_INIT([git], [@@GIT_VERSION@@], [git@vger.kernel.org])

 AC_CONFIG_SRCDIR([git.c])

 config_file=config.mak.autogen
 config_append=config.mak.append
 config_in=config.mak.in

 echo "# ${config_append}.  Generated by configure." > "${config_append}"


 ## Definitions of macros
 # GIT_CONF_APPEND_LINE(LINE)
 # --------------------------
 # Append LINE to file ${config_append}
 AC_DEFUN([GIT_CONF_APPEND_LINE],
 [echo "$1" >> "${config_append}"])# GIT_CONF_APPEND_LINE
 #
 # GIT_ARG_SET_PATH(PROGRAM)
 # -------------------------
 # Provide --with-PROGRAM=PATH option to set PATH to PROGRAM
 AC_DEFUN([GIT_ARG_SET_PATH],
 [AC_ARG_WITH([$1],
  [AS_HELP_STRING([--with-$1=PATH],
                  [provide PATH to $1])],
  [GIT_CONF_APPEND_PATH($1)],[])
 ])# GIT_ARG_SET_PATH
 #
 # GIT_CONF_APPEND_PATH(PROGRAM)
 # ------------------------------
 # Parse --with-PROGRAM=PATH option to set PROGRAM_PATH=PATH
 # Used by GIT_ARG_SET_PATH(PROGRAM)
 AC_DEFUN([GIT_CONF_APPEND_PATH],
 [PROGRAM=m4_toupper($1); \
 if test "$withval" = "no"; then \
 	AC_MSG_ERROR([You cannot use git without $1]); \
 else \
 	if test "$withval" = "yes"; then \
 		AC_MSG_WARN([You should provide path for --with-$1=PATH]); \
 	else \
 		GIT_CONF_APPEND_LINE(${PROGRAM}_PATH=$withval); \
 	fi; \
 fi; \
 ]) # GIT_CONF_APPEND_PATH
 #
 # GIT_PARSE_WITH(PACKAGE)
 # -----------------------
 # For use in AC_ARG_WITH action-if-found, for packages default ON.
 # * Set NO_PACKAGE=YesPlease for --without-PACKAGE
 # * Set PACKAGEDIR=PATH for --with-PACKAGE=PATH
 # * Unset NO_PACKAGE for --with-PACKAGE without ARG
 AC_DEFUN([GIT_PARSE_WITH],
 [PACKAGE=m4_toupper($1); \
 if test "$withval" = "no"; then \
 	m4_toupper(NO_$1)=YesPlease; \
 elif test "$withval" = "yes"; then \
 	m4_toupper(NO_$1)=; \
 else \
 	m4_toupper(NO_$1)=; \
 	GIT_CONF_APPEND_LINE(${PACKAGE}DIR=$withval); \
 fi \
 ])# GIT_PARSE_WITH


 ## Site configuration related to programs (before tests)
 ## --with-PACKAGE[=ARG] and --without-PACKAGE
 #
 # Set lib to alternative name of lib directory (e.g. lib64)
 AC_ARG_WITH([lib],
  [AS_HELP_STRING([--with-lib=ARG],
                  [ARG specifies alternative name for lib directory])],
  [if test "$withval" = "no" -o "$withval" = "yes"; then \
 	AC_MSG_WARN([You should provide name for --with-lib=ARG]); \
 else \
 	GIT_CONF_APPEND_LINE(lib=$withval); \
 fi; \
 ],[])
 #
 # Define SHELL_PATH to provide path to shell.
 GIT_ARG_SET_PATH(shell)
 #
 # Define PERL_PATH to provide path to Perl.
 GIT_ARG_SET_PATH(perl)
 #
 # Define ZLIB_PATH to provide path to zlib.
 GIT_ARG_SET_PATH(zlib)
 #
 # Declare the with-tcltk/without-tcltk options.
 AC_ARG_WITH(tcltk,
 AS_HELP_STRING([--with-tcltk],[use Tcl/Tk GUI (default is YES)])
 AS_HELP_STRING([],[ARG is the full path to the Tcl/Tk interpreter.])
 AS_HELP_STRING([],[Bare --with-tcltk will make the GUI part only if])
 AS_HELP_STRING([],[Tcl/Tk interpreter will be found in a system.]),\
 GIT_PARSE_WITH(tcltk))
 #


 ## Checks for programs.
 AC_MSG_NOTICE([CHECKS for programs])
 #
 AC_PROG_CC([cc gcc])
 #AC_PROG_INSTALL		# needs install-sh or install.sh in sources
 AC_CHECK_TOOL(AR, ar, :)
 AC_CHECK_PROGS(TAR, [gtar tar])
 # TCLTK_PATH will be set to some value if we want Tcl/Tk
 # or will be empty otherwise.
 if test -z "$NO_TCLTK"; then
   if test "$with_tcltk" = ""; then
   # No Tcl/Tk switches given. Do not check for Tcl/Tk, use bare 'wish'.
     TCLTK_PATH=wish
     AC_SUBST(TCLTK_PATH)
   elif test "$with_tcltk" = "yes"; then
   # Tcl/Tk check requested.
     AC_CHECK_PROGS(TCLTK_PATH, [wish], )
   else
     AC_MSG_RESULT([Using Tcl/Tk interpreter $with_tcltk])
     TCLTK_PATH="$with_tcltk"
     AC_SUBST(TCLTK_PATH)
   fi
 fi

 ## Checks for libraries.
 AC_MSG_NOTICE([CHECKS for libraries])
 #
 # Define NO_OPENSSL environment variable if you do not have OpenSSL.
 # Define NEEDS_SSL_WITH_CRYPTO if you need -lcrypto with -lssl (Darwin).
 AC_CHECK_LIB([crypto], [SHA1_Init],
 [NEEDS_SSL_WITH_CRYPTO=],
 [AC_CHECK_LIB([ssl], [SHA1_Init],
  [NEEDS_SSL_WITH_CRYPTO=YesPlease
   NEEDS_SSL_WITH_CRYPTO=],
  [NO_OPENSSL=YesPlease])])
 AC_SUBST(NEEDS_SSL_WITH_CRYPTO)
 AC_SUBST(NO_OPENSSL)
 #
 # Define NO_CURL if you do not have curl installed.  git-http-pull and
 # git-http-push are not built, and you cannot use http:// and https://
 # transports.
 AC_CHECK_LIB([curl], [curl_global_init],
 [NO_CURL=],
 [NO_CURL=YesPlease])
 AC_SUBST(NO_CURL)
 #
 # Define NO_EXPAT if you do not have expat installed.  git-http-push is
 # not built, and you cannot push using http:// and https:// transports.
 AC_CHECK_LIB([expat], [XML_ParserCreate],
 [NO_EXPAT=],
 [NO_EXPAT=YesPlease])
 AC_SUBST(NO_EXPAT)
 #
 # Define NEEDS_LIBICONV if linking with libc is not enough (Darwin and
 # some Solaris installations).
 # Define NO_ICONV if neither libc nor libiconv support iconv.
 AC_DEFUN([ICONVTEST_SRC], [
 #include <iconv.h>

 int main(void)
 {
 	iconv_open("", "");
 	return 0;
 }
 ])
 AC_MSG_CHECKING([for iconv in -lc])
 AC_LINK_IFELSE(ICONVTEST_SRC,
 	[AC_MSG_RESULT([yes])
 	NEEDS_LIBICONV=],
 	[AC_MSG_RESULT([no])
 	old_LIBS="$LIBS"
 	LIBS="$LIBS -liconv"
 	AC_MSG_CHECKING([for iconv in -liconv])
 	AC_LINK_IFELSE(ICONVTEST_SRC,
 		[AC_MSG_RESULT([yes])
 		NEEDS_LIBICONV=YesPlease],
 		[AC_MSG_RESULT([no])
 		NO_ICONV=YesPlease])
 	LIBS="$old_LIBS"])
 AC_SUBST(NEEDS_LIBICONV)
 AC_SUBST(NO_ICONV)
 test -n "$NEEDS_LIBICONV" && LIBS="$LIBS -liconv"
 #
 # Define NEEDS_SOCKET if linking with libc is not enough (SunOS,
 # Patrick Mauritz).
 AC_CHECK_LIB([c], [socket],
 [NEEDS_SOCKET=],
 [NEEDS_SOCKET=YesPlease])
 AC_SUBST(NEEDS_SOCKET)
 test -n "$NEEDS_SOCKET" && LIBS="$LIBS -lsocket"


 ## Checks for header files.


 ## Checks for typedefs, structures, and compiler characteristics.
 AC_MSG_NOTICE([CHECKS for typedefs, structures, and compiler characteristics])
 #
 # Define NO_D_INO_IN_DIRENT if you don't have d_ino in your struct dirent.
 AC_CHECK_MEMBER(struct dirent.d_ino,
 [NO_D_INO_IN_DIRENT=],
 [NO_D_INO_IN_DIRENT=YesPlease],
 [#include <dirent.h>])
 AC_SUBST(NO_D_INO_IN_DIRENT)
 #
 # Define NO_D_TYPE_IN_DIRENT if your platform defines DT_UNKNOWN but lacks
 # d_type in struct dirent (latest Cygwin -- will be fixed soonish).
 AC_CHECK_MEMBER(struct dirent.d_type,
 [NO_D_TYPE_IN_DIRENT=],
 [NO_D_TYPE_IN_DIRENT=YesPlease],
 [#include <dirent.h>])
 AC_SUBST(NO_D_TYPE_IN_DIRENT)
 #
 # Define NO_SOCKADDR_STORAGE if your platform does not have struct
 # sockaddr_storage.
 AC_CHECK_TYPE(struct sockaddr_storage,
 [NO_SOCKADDR_STORAGE=],
 [NO_SOCKADDR_STORAGE=YesPlease],[
 #include <sys/types.h>
 #include <sys/socket.h>
 ])
 AC_SUBST(NO_SOCKADDR_STORAGE)
 #
 # Define NO_IPV6 if you lack IPv6 support and getaddrinfo().
 AC_CHECK_TYPE([struct addrinfo],[
  AC_CHECK_FUNC([getaddrinfo],
   [NO_IPV6=],
   [NO_IPV6=YesPlease])
 ],[NO_IPV6=YesPlease],[
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netdb.h>
 ])
 AC_SUBST(NO_IPV6)
 #
 # Define NO_C99_FORMAT if your formatted IO functions (printf/scanf et.al.)
 # do not support the 'size specifiers' introduced by C99, namely ll, hh,
 # j, z, t. (representing long long int, char, intmax_t, size_t, ptrdiff_t).
 # some C compilers supported these specifiers prior to C99 as an extension.
 AC_CACHE_CHECK([whether formatted IO functions support C99 size specifiers],
  [ac_cv_c_c99_format],
 [# Actually git uses only %z (%zu) in alloc.c, and %t (%td) in mktag.c
 AC_RUN_IFELSE(
 	[AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
 		[[char buf[64];
 		if (sprintf(buf, "%lld%hhd%jd%zd%td", (long long int)1, (char)2, (intmax_t)3, (size_t)4, (ptrdiff_t)5) != 5)
 		  exit(1);
 		else if (strcmp(buf, "12345"))
 		  exit(2);]])],
 	[ac_cv_c_c99_format=yes],
 	[ac_cv_c_c99_format=no])
 ])
 if test $ac_cv_c_c99_format = no; then
 	NO_C99_FORMAT=YesPlease
 else
 	NO_C99_FORMAT=
 fi
 AC_SUBST(NO_C99_FORMAT)


 ## Checks for library functions.
 ## (in default C library and libraries checked by AC_CHECK_LIB)
 AC_MSG_NOTICE([CHECKS for library functions])
 #
 # Define NO_STRCASESTR if you don't have strcasestr.
 AC_CHECK_FUNC(strcasestr,
 [NO_STRCASESTR=],
 [NO_STRCASESTR=YesPlease])
 AC_SUBST(NO_STRCASESTR)
 #
 # Define NO_STRLCPY if you don't have strlcpy.
 AC_CHECK_FUNC(strlcpy,
 [NO_STRLCPY=],
 [NO_STRLCPY=YesPlease])
 AC_SUBST(NO_STRLCPY)
 #
 # Define NO_SETENV if you don't have setenv in the C library.
 AC_CHECK_FUNC(setenv,
 [NO_SETENV=],
 [NO_SETENV=YesPlease])
 AC_SUBST(NO_SETENV)
 #
 # Define NO_MMAP if you want to avoid mmap.
 #
 # Define NO_ICONV if your libc does not properly support iconv.


 ## Other checks.
 # Define USE_PIC if you need the main git objects to be built with -fPIC
 # in order to build and link perl/Git.so.  x86-64 seems to need this.
 #
 # Define NO_SYMLINK_HEAD if you never want .git/HEAD to be a symbolic link.
 # Enable it on Windows.  By default, symrefs are still used.

 ## Site configuration (override autodetection)
 ## --with-PACKAGE[=ARG] and --without-PACKAGE
 AC_MSG_NOTICE([CHECKS for site configuration])
 #
 # Define NO_SVN_TESTS if you want to skip time-consuming SVN interoperability
 # tests.  These tests take up a significant amount of the total test time
 # but are not needed unless you plan to talk to SVN repos.
 #
 # Define MOZILLA_SHA1 environment variable when running make to make use of
 # a bundled SHA1 routine coming from Mozilla. It is GPL'd and should be fast
 # on non-x86 architectures (e.g. PowerPC), while the OpenSSL version (default
 # choice) has very fast version optimized for i586.
 #
 # Define PPC_SHA1 environment variable when running make to make use of
 # a bundled SHA1 routine optimized for PowerPC.
 #
 # Define ARM_SHA1 environment variable when running make to make use of
 # a bundled SHA1 routine optimized for ARM.
 #
 # Define NO_OPENSSL environment variable if you do not have OpenSSL.
 # This also implies MOZILLA_SHA1.
 #
 # Define OPENSSLDIR=/foo/bar if your openssl header and library files are in
 # /foo/bar/include and /foo/bar/lib directories.
 AC_ARG_WITH(openssl,
 AS_HELP_STRING([--with-openssl],[use OpenSSL library (default is YES)])
 AS_HELP_STRING([],              [ARG can be prefix for openssl library and headers]),\
 GIT_PARSE_WITH(openssl))
 #
 # Define NO_CURL if you do not have curl installed.  git-http-pull and
 # git-http-push are not built, and you cannot use http:// and https://
 # transports.
 #
 # Define CURLDIR=/foo/bar if your curl header and library files are in
 # /foo/bar/include and /foo/bar/lib directories.
 AC_ARG_WITH(curl,
 AS_HELP_STRING([--with-curl],[support http(s):// transports (default is YES)])
 AS_HELP_STRING([],           [ARG can be also prefix for curl library and headers]),
 GIT_PARSE_WITH(curl))
 #
 # Define NO_EXPAT if you do not have expat installed.  git-http-push is
 # not built, and you cannot push using http:// and https:// transports.
 #
 # Define EXPATDIR=/foo/bar if your expat header and library files are in
 # /foo/bar/include and /foo/bar/lib directories.
 AC_ARG_WITH(expat,
 AS_HELP_STRING([--with-expat],
 [support git-push using http:// and https:// transports via WebDAV (default is YES)])
 AS_HELP_STRING([],            [ARG can be also prefix for expat library and headers]),
 GIT_PARSE_WITH(expat))
 #
 # Define NO_FINK if you are building on Darwin/Mac OS X, have Fink
 # installed in /sw, but don't want GIT to link against any libraries
 # installed there.  If defined you may specify your own (or Fink's)
 # include directories and library directories by defining CFLAGS
 # and LDFLAGS appropriately.
 #
 # Define NO_DARWIN_PORTS if you are building on Darwin/Mac OS X,
 # have DarwinPorts installed in /opt/local, but don't want GIT to
 # link against any libraries installed there.  If defined you may
 # specify your own (or DarwinPort's) include directories and
 # library directories by defining CFLAGS and LDFLAGS appropriately.
 #
 # Define NO_MMAP if you want to avoid mmap.
 #
 # Define NO_ICONV if your libc does not properly support iconv.
 AC_ARG_WITH(iconv,
 AS_HELP_STRING([--without-iconv],
 [if your architecture doesn't properly support iconv])
 AS_HELP_STRING([--with-iconv=PATH],
 [PATH is prefix for libiconv library and headers])
 AS_HELP_STRING([],
 [used only if you need linking with libiconv]),
 GIT_PARSE_WITH(iconv))

 ## --enable-FEATURE[=ARG] and --disable-FEATURE
 #
 # Define USE_NSEC below if you want git to care about sub-second file mtimes
 # and ctimes. Note that you need recent glibc (at least 2.2.4) for this, and
 # it will BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely
 # randomly break unless your underlying filesystem supports those sub-second
 # times (my ext3 doesn't).
 #
 # Define USE_STDEV below if you want git to care about the underlying device
 # change being considered an inode change from the update-cache perspective.


 ## Output files
 AC_CONFIG_FILES(["${config_file}":"${config_in}":"${config_append}"])
 AC_OUTPUT


 ## Cleanup
 rm -f "${config_append}"
	# -- Autoconf --
	# Process this file with autoconf to produce a configure script.

	AC_PREREQ(2.59)
	AC_INIT([git], [@@GIT_VERSION@@], [git@vger.kernel.org])

	AC_CONFIG_SRCDIR([git.c])

	config_file=config.mak.autogen
	config_append=config.mak.append
	config_in=config.mak.in

	echo "# ${config_append}. Generated by configure." > "${config_append}"


	## Definitions of macros
	# GIT_CONF_APPEND_LINE(LINE)
	# --------------------------
	# Append LINE to file ${config_append}
	AC_DEFUN([GIT_CONF_APPEND_LINE],
	[echo "$1" >> "${config_append}"])# GIT_CONF_APPEND_LINE
	#
	# GIT_ARG_SET_PATH(PROGRAM)
	# -------------------------
	# Provide --with-PROGRAM=PATH option to set PATH to PROGRAM
	AC_DEFUN([GIT_ARG_SET_PATH],
	[AC_ARG_WITH([$1],
	[AS_HELP_STRING([--with-$1=PATH],
	[provide PATH to $1])],
	[GIT_CONF_APPEND_PATH($1)],[])
	])# GIT_ARG_SET_PATH
	#
	# GIT_CONF_APPEND_PATH(PROGRAM)
	# ------------------------------
	# Parse --with-PROGRAM=PATH option to set PROGRAM_PATH=PATH
	# Used by GIT_ARG_SET_PATH(PROGRAM)
	AC_DEFUN([GIT_CONF_APPEND_PATH],
	[PROGRAM=m4_toupper($1); \
	if test "$withval" = "no"; then \
	AC_MSG_ERROR([You cannot use git without $1]); \
	else \
	if test "$withval" = "yes"; then \
	AC_MSG_WARN([You should provide path for --with-$1=PATH]); \
	else \
	GIT_CONF_APPEND_LINE(${PROGRAM}_PATH=$withval); \
	fi; \
	fi; \
	]) # GIT_CONF_APPEND_PATH
	#
	# GIT_PARSE_WITH(PACKAGE)
	# -----------------------
	# For use in AC_ARG_WITH action-if-found, for packages default ON.
	# * Set NO_PACKAGE=YesPlease for --without-PACKAGE
	# * Set PACKAGEDIR=PATH for --with-PACKAGE=PATH
	# * Unset NO_PACKAGE for --with-PACKAGE without ARG
	AC_DEFUN([GIT_PARSE_WITH],
	[PACKAGE=m4_toupper($1); \
	if test "$withval" = "no"; then \
	m4_toupper(NO_$1)=YesPlease; \
	elif test "$withval" = "yes"; then \
	m4_toupper(NO_$1)=; \
	else \
	m4_toupper(NO_$1)=; \
	GIT_CONF_APPEND_LINE(${PACKAGE}DIR=$withval); \
	fi \
	])# GIT_PARSE_WITH


	## Site configuration related to programs (before tests)
	## --with-PACKAGE[=ARG] and --without-PACKAGE
	#
	# Set lib to alternative name of lib directory (e.g. lib64)
	AC_ARG_WITH([lib],
	[AS_HELP_STRING([--with-lib=ARG],
	[ARG specifies alternative name for lib directory])],
	[if test "$withval" = "no" -o "$withval" = "yes"; then \
	AC_MSG_WARN([You should provide name for --with-lib=ARG]); \
	else \
	GIT_CONF_APPEND_LINE(lib=$withval); \
	fi; \
	],[])
	#
	# Define SHELL_PATH to provide path to shell.
	GIT_ARG_SET_PATH(shell)
	#
	# Define PERL_PATH to provide path to Perl.
	GIT_ARG_SET_PATH(perl)
	#
	# Define ZLIB_PATH to provide path to zlib.
	GIT_ARG_SET_PATH(zlib)
	#
	# Declare the with-tcltk/without-tcltk options.
	AC_ARG_WITH(tcltk,
	AS_HELP_STRING([--with-tcltk],[use Tcl/Tk GUI (default is YES)])
	AS_HELP_STRING([],[ARG is the full path to the Tcl/Tk interpreter.])
	AS_HELP_STRING([],[Bare --with-tcltk will make the GUI part only if])
	AS_HELP_STRING([],[Tcl/Tk interpreter will be found in a system.]),\
	GIT_PARSE_WITH(tcltk))
	#


	## Checks for programs.
	AC_MSG_NOTICE([CHECKS for programs])
	#
	AC_PROG_CC([cc gcc])
	#AC_PROG_INSTALL # needs install-sh or install.sh in sources
	AC_CHECK_TOOL(AR, ar, :)
	AC_CHECK_PROGS(TAR, [gtar tar])
	# TCLTK_PATH will be set to some value if we want Tcl/Tk
	# or will be empty otherwise.
	if test -z "$NO_TCLTK"; then
	if test "$with_tcltk" = ""; then
	# No Tcl/Tk switches given. Do not check for Tcl/Tk, use bare 'wish'.
	TCLTK_PATH=wish
	AC_SUBST(TCLTK_PATH)
	elif test "$with_tcltk" = "yes"; then
	# Tcl/Tk check requested.
	AC_CHECK_PROGS(TCLTK_PATH, [wish], )
	else
	AC_MSG_RESULT([Using Tcl/Tk interpreter $with_tcltk])
	TCLTK_PATH="$with_tcltk"
	AC_SUBST(TCLTK_PATH)
	fi
	fi

	## Checks for libraries.
	AC_MSG_NOTICE([CHECKS for libraries])
	#
	# Define NO_OPENSSL environment variable if you do not have OpenSSL.
	# Define NEEDS_SSL_WITH_CRYPTO if you need -lcrypto with -lssl (Darwin).
	AC_CHECK_LIB([crypto], [SHA1_Init],
	[NEEDS_SSL_WITH_CRYPTO=],
	[AC_CHECK_LIB([ssl], [SHA1_Init],
	[NEEDS_SSL_WITH_CRYPTO=YesPlease
	NEEDS_SSL_WITH_CRYPTO=],
	[NO_OPENSSL=YesPlease])])
	AC_SUBST(NEEDS_SSL_WITH_CRYPTO)
	AC_SUBST(NO_OPENSSL)
	#
	# Define NO_CURL if you do not have curl installed. git-http-pull and
	# git-http-push are not built, and you cannot use http:// and https://
	# transports.
	AC_CHECK_LIB([curl], [curl_global_init],
	[NO_CURL=],
	[NO_CURL=YesPlease])
	AC_SUBST(NO_CURL)
	#
	# Define NO_EXPAT if you do not have expat installed. git-http-push is
	# not built, and you cannot push using http:// and https:// transports.
	AC_CHECK_LIB([expat], [XML_ParserCreate],
	[NO_EXPAT=],
	[NO_EXPAT=YesPlease])
	AC_SUBST(NO_EXPAT)
	#
	# Define NEEDS_LIBICONV if linking with libc is not enough (Darwin and
	# some Solaris installations).
	# Define NO_ICONV if neither libc nor libiconv support iconv.
	AC_DEFUN([ICONVTEST_SRC], [
	#include <iconv.h>

	int main(void)
	{
	iconv_open("", "");
	return 0;
	}
	])
	AC_MSG_CHECKING([for iconv in -lc])
	AC_LINK_IFELSE(ICONVTEST_SRC,
	[AC_MSG_RESULT([yes])
	NEEDS_LIBICONV=],
	[AC_MSG_RESULT([no])
	old_LIBS="$LIBS"
	LIBS="$LIBS -liconv"
	AC_MSG_CHECKING([for iconv in -liconv])
	AC_LINK_IFELSE(ICONVTEST_SRC,
	[AC_MSG_RESULT([yes])
	NEEDS_LIBICONV=YesPlease],
	[AC_MSG_RESULT([no])
	NO_ICONV=YesPlease])
	LIBS="$old_LIBS"])
	AC_SUBST(NEEDS_LIBICONV)
	AC_SUBST(NO_ICONV)
	test -n "$NEEDS_LIBICONV" && LIBS="$LIBS -liconv"
	#
	# Define NEEDS_SOCKET if linking with libc is not enough (SunOS,
	# Patrick Mauritz).
	AC_CHECK_LIB([c], [socket],
	[NEEDS_SOCKET=],
	[NEEDS_SOCKET=YesPlease])
	AC_SUBST(NEEDS_SOCKET)
	test -n "$NEEDS_SOCKET" && LIBS="$LIBS -lsocket"


	## Checks for header files.


	## Checks for typedefs, structures, and compiler characteristics.
	AC_MSG_NOTICE([CHECKS for typedefs, structures, and compiler characteristics])
	#
	# Define NO_D_INO_IN_DIRENT if you don't have d_ino in your struct dirent.
	AC_CHECK_MEMBER(struct dirent.d_ino,
	[NO_D_INO_IN_DIRENT=],
	[NO_D_INO_IN_DIRENT=YesPlease],
	[#include <dirent.h>])
	AC_SUBST(NO_D_INO_IN_DIRENT)
	#
	# Define NO_D_TYPE_IN_DIRENT if your platform defines DT_UNKNOWN but lacks
	# d_type in struct dirent (latest Cygwin -- will be fixed soonish).
	AC_CHECK_MEMBER(struct dirent.d_type,
	[NO_D_TYPE_IN_DIRENT=],
	[NO_D_TYPE_IN_DIRENT=YesPlease],
	[#include <dirent.h>])
	AC_SUBST(NO_D_TYPE_IN_DIRENT)
	#
	# Define NO_SOCKADDR_STORAGE if your platform does not have struct
	# sockaddr_storage.
	AC_CHECK_TYPE(struct sockaddr_storage,
	[NO_SOCKADDR_STORAGE=],
	[NO_SOCKADDR_STORAGE=YesPlease],[
	#include <sys/types.h>
	#include <sys/socket.h>
	])
	AC_SUBST(NO_SOCKADDR_STORAGE)
	#
	# Define NO_IPV6 if you lack IPv6 support and getaddrinfo().
	AC_CHECK_TYPE([struct addrinfo],[
	AC_CHECK_FUNC([getaddrinfo],
	[NO_IPV6=],
	[NO_IPV6=YesPlease])
	],[NO_IPV6=YesPlease],[
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netdb.h>
	])
	AC_SUBST(NO_IPV6)
	#
	# Define NO_C99_FORMAT if your formatted IO functions (printf/scanf et.al.)
	# do not support the 'size specifiers' introduced by C99, namely ll, hh,
	# j, z, t. (representing long long int, char, intmax_t, size_t, ptrdiff_t).
	# some C compilers supported these specifiers prior to C99 as an extension.
	AC_CACHE_CHECK([whether formatted IO functions support C99 size specifiers],
	[ac_cv_c_c99_format],
	[# Actually git uses only %z (%zu) in alloc.c, and %t (%td) in mktag.c
	AC_RUN_IFELSE(
	[AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
	[[char buf[64];
	if (sprintf(buf, "%lld%hhd%jd%zd%td", (long long int)1, (char)2, (intmax_t)3, (size_t)4, (ptrdiff_t)5) != 5)
	exit(1);
	else if (strcmp(buf, "12345"))
	exit(2);]])],
	[ac_cv_c_c99_format=yes],
	[ac_cv_c_c99_format=no])
	])
	if test $ac_cv_c_c99_format = no; then
	NO_C99_FORMAT=YesPlease
	else
	NO_C99_FORMAT=
	fi
	AC_SUBST(NO_C99_FORMAT)


	## Checks for library functions.
	## (in default C library and libraries checked by AC_CHECK_LIB)
	AC_MSG_NOTICE([CHECKS for library functions])
	#
	# Define NO_STRCASESTR if you don't have strcasestr.
	AC_CHECK_FUNC(strcasestr,
	[NO_STRCASESTR=],
	[NO_STRCASESTR=YesPlease])
	AC_SUBST(NO_STRCASESTR)
	#
	# Define NO_STRLCPY if you don't have strlcpy.
	AC_CHECK_FUNC(strlcpy,
	[NO_STRLCPY=],
	[NO_STRLCPY=YesPlease])
	AC_SUBST(NO_STRLCPY)
	#
	# Define NO_SETENV if you don't have setenv in the C library.
	AC_CHECK_FUNC(setenv,
	[NO_SETENV=],
	[NO_SETENV=YesPlease])
	AC_SUBST(NO_SETENV)
	#
	# Define NO_MMAP if you want to avoid mmap.
	#
	# Define NO_ICONV if your libc does not properly support iconv.


	## Other checks.
	# Define USE_PIC if you need the main git objects to be built with -fPIC
	# in order to build and link perl/Git.so. x86-64 seems to need this.
	#
	# Define NO_SYMLINK_HEAD if you never want .git/HEAD to be a symbolic link.
	# Enable it on Windows. By default, symrefs are still used.

	## Site configuration (override autodetection)
	## --with-PACKAGE[=ARG] and --without-PACKAGE
	AC_MSG_NOTICE([CHECKS for site configuration])
	#
	# Define NO_SVN_TESTS if you want to skip time-consuming SVN interoperability
	# tests. These tests take up a significant amount of the total test time
	# but are not needed unless you plan to talk to SVN repos.
	#
	# Define MOZILLA_SHA1 environment variable when running make to make use of
	# a bundled SHA1 routine coming from Mozilla. It is GPL'd and should be fast
	# on non-x86 architectures (e.g. PowerPC), while the OpenSSL version (default
	# choice) has very fast version optimized for i586.
	#
	# Define PPC_SHA1 environment variable when running make to make use of
	# a bundled SHA1 routine optimized for PowerPC.
	#
	# Define ARM_SHA1 environment variable when running make to make use of
	# a bundled SHA1 routine optimized for ARM.
	#
	# Define NO_OPENSSL environment variable if you do not have OpenSSL.
	# This also implies MOZILLA_SHA1.
	#
	# Define OPENSSLDIR=/foo/bar if your openssl header and library files are in
	# /foo/bar/include and /foo/bar/lib directories.
	AC_ARG_WITH(openssl,
	AS_HELP_STRING([--with-openssl],[use OpenSSL library (default is YES)])
	AS_HELP_STRING([], [ARG can be prefix for openssl library and headers]),\
	GIT_PARSE_WITH(openssl))
	#
	# Define NO_CURL if you do not have curl installed. git-http-pull and
	# git-http-push are not built, and you cannot use http:// and https://
	# transports.
	#
	# Define CURLDIR=/foo/bar if your curl header and library files are in
	# /foo/bar/include and /foo/bar/lib directories.
	AC_ARG_WITH(curl,
	AS_HELP_STRING([--with-curl],[support http(s):// transports (default is YES)])
	AS_HELP_STRING([], [ARG can be also prefix for curl library and headers]),
	GIT_PARSE_WITH(curl))
	#
	# Define NO_EXPAT if you do not have expat installed. git-http-push is
	# not built, and you cannot push using http:// and https:// transports.
	#
	# Define EXPATDIR=/foo/bar if your expat header and library files are in
	# /foo/bar/include and /foo/bar/lib directories.
	AC_ARG_WITH(expat,
	AS_HELP_STRING([--with-expat],
	[support git-push using http:// and https:// transports via WebDAV (default is YES)])
	AS_HELP_STRING([], [ARG can be also prefix for expat library and headers]),
	GIT_PARSE_WITH(expat))
	#
	# Define NO_FINK if you are building on Darwin/Mac OS X, have Fink
	# installed in /sw, but don't want GIT to link against any libraries
	# installed there. If defined you may specify your own (or Fink's)
	# include directories and library directories by defining CFLAGS
	# and LDFLAGS appropriately.
	#
	# Define NO_DARWIN_PORTS if you are building on Darwin/Mac OS X,
	# have DarwinPorts installed in /opt/local, but don't want GIT to
	# link against any libraries installed there. If defined you may
	# specify your own (or DarwinPort's) include directories and
	# library directories by defining CFLAGS and LDFLAGS appropriately.
	#
	# Define NO_MMAP if you want to avoid mmap.
	#
	# Define NO_ICONV if your libc does not properly support iconv.
	AC_ARG_WITH(iconv,
	AS_HELP_STRING([--without-iconv],
	[if your architecture doesn't properly support iconv])
	AS_HELP_STRING([--with-iconv=PATH],
	[PATH is prefix for libiconv library and headers])
	AS_HELP_STRING([],
	[used only if you need linking with libiconv]),
	GIT_PARSE_WITH(iconv))

	## --enable-FEATURE[=ARG] and --disable-FEATURE
	#
	# Define USE_NSEC below if you want git to care about sub-second file mtimes
	# and ctimes. Note that you need recent glibc (at least 2.2.4) for this, and
	# it will BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely
	# randomly break unless your underlying filesystem supports those sub-second
	# times (my ext3 doesn't).
	#
	# Define USE_STDEV below if you want git to care about the underlying device
	# change being considered an inode change from the update-cache perspective.


	## Output files
	AC_CONFIG_FILES(["${config_file}":"${config_in}":"${config_append}"])
	AC_OUTPUT


	## Cleanup
	rm -f "${config_append}"