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configure.ac
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	-- Autoconf --
	# Process this file with autoconf to produce a configure script.
	# Order is largely irrevellant, although it must start with AC_INIT and end with AC_OUTPUT
	# See http://autotoolset.sourceforge.net/tutorial.html
	# and http://www.openismus.com/documents/linux/automake/automake.shtml

	AC_INIT([AFFLIB],[3.7.0],[bugs@afflib.org])
	AM_INIT_AUTOMAKE
	AM_MAINTAINER_MODE

	AC_CONFIG_FILES([Makefile lib/Makefile tools/Makefile lzma443/Makefile
	tests/Makefile doc/Makefile pyaff/Makefile man/Makefile lib/version.h])
	AC_CONFIG_FILES([afflib.spec])
	AM_CONFIG_HEADER([affconfig.h])

	# Where we get installed
	AC_PREFIX_PROGRAM

	# Programs that we will be using
	AC_PROG_CC
	AC_PROG_CXX
	AC_PROG_INSTALL

	# Turn off shared libraries during beta-testing, since they
	# make the build process take too long.
	AC_PROG_LIBTOOL
	AC_CONFIG_MACRO_DIR([m4])

	# We are now threading
	m4_include([m4/acx_pthread.m4])
	m4_include([m4/acinclude.m4])
	ACX_PTHREAD()

	if test x"${cross_compiling}" = "xno" ; then
	# Bring additional directories where things might be found into our
	# search path. I don't know why autoconf doesn't do this by default
	for spfx in /usr/local /opt/local /sw ${prefix} ; do
	AC_MSG_NOTICE([checking ${spfx}/include])
	if test -d ${spfx}/include; then
	CPPFLAGS="-I${spfx}/include $CPPFLAGS"
	LDFLAGS="-L${spfx}/lib $LDFLAGS"
	AC_MSG_NOTICE([ * ADDING ${spfx}/include to CPPFLAGS * ])
	AC_MSG_NOTICE([ * ADDING ${spfx}/lib to LDFLAGS * ])
	fi
	done
	AC_MSG_NOTICE([ CPPFLAGS = ${CPPFLAGS} ])
	AC_MSG_NOTICE([ LDFLAGS = ${LDFLAGS} ])
	else
	AC_MSG_NOTICE([Cross Compiling --- will not update CPPFALGS or LDFLAGS with /usr/local, /opt/local or /sw])
	LIBS="$LIBS -lws2_32 -lgdi32"
	fi

	if test -r /bin/uname.exe ; then
	if test `uname -o` == "Msys" ; then
	AC_MSG_NOTICE([Compiling with Msys. Setting flags appropriately.])
	enable_qemu="no"
	#CPPFLAGS="$CPPFLAGS -D__USE_MINGW_ANSI_STDIO"
	LIBS="$LIBS -lws2_32 -lgdi32"
	#LDFLAGS="$LDFLAGS -Wl,--enable-auto-import"
	fi
	fi

	# Special features that I use
	AC_FUNC_ALLOCA
	AC_FUNC_FSEEKO
	AC_HEADER_DIRENT
	AC_HEADER_STDC
	AC_SYS_LARGEFILE


	# Checks for typedefs, structures, and compiler characteristics.
	AC_HEADER_STDBOOL
	AC_C_CONST
	AC_C_INLINE
	AC_TYPE_MODE_T
	AC_TYPE_OFF_T
	AC_TYPE_SIZE_T
	AC_STRUCT_TM
	AC_STRUCT_ST_BLOCKS
	AC_STRUCT_ST_RDEV


	# Specific headers that I plan to use
	AC_CHECK_HEADERS([arpa/inet.h assert.h ctype.h dmalloc.h err.h errno.h fcntl.h getopt.h inttypes.h linux/fs.h malloc.h ncurses/term.h netinet/in.h regex.h signal.h stdint.h stdio.h stdlib.h string.h sys/cdefs.h sys/disk.h sys/file.h sys/ioctl.h sys/ioctl.h sys/param.h sys/param.h sys/socket.h sys/signal.h sys/stat.h sys/time.h sys/types.h sys/vfs.h sysexits.h term.h time.h unistd.h zlib.h _mingw.h])

	AC_CHECK_LIB([regex],[regcomp]) # see if we need -lregex

	AC_CHECK_MEMBER([struct sockaddr_in.sin_len],
	[ AC_DEFINE(HAVE_SOCKADDR_SIN_LEN, 1, [Do we have sockaddr.sin_len?]) ],
	[],
	[
	#include <sys/types.h>
	#include <sys/socket.h>
	#include <netinet/in.h>
	])


	# Specific functions that we want to know about
	AC_CHECK_FUNCS([getprogname strlcpy strlcat err_set_exit srandom srandomdev flock fstatfs valloc isdigit isalnum isalphanum isatty popen ftruncate memset mkdir putenv regcomp srandomdev strcasecmp strchr strdup strerror strrchr err errx warn warnx utimes unsetenv])

	# Special features that can be enabled or disabled
	AC_ARG_WITH([noopt], AC_HELP_STRING([--with-noopt],[Drop -O C flags]))

	# C++ headers
	AC_PROG_CXX
	AC_LANG_PUSH([C++])
	AC_CHECK_HEADERS([cstring])
	AC_CHECK_HEADERS([string],
	AC_DEFINE([HAVE_STL],1,[STL Present])
	AC_MSG_NOTICE([STL Present]))
	AC_LANG_POP([C++])

	################################################################
	# For AFF tools
	AC_CHECK_HEADERS([readline/readline.h])
	AC_CHECK_HEADERS([curses.h termcap.h])
	AC_CHECK_LIB([readline],[readline],, AC_MSG_RESULT([readline not installed]))
	AC_CHECK_LIB([ncurses],[initscr],, AC_MSG_RESULT([ncurses not installed]))
	AC_CHECK_LIB([z],[uncompress],, AC_MSG_ERROR([zlib not installed; cannot continue. Try adding zlib-dev or zlib1g-dev.]))
	AC_CHECK_LIB([rt],[aio_error64])
	AC_SEARCH_LIBS(tgetent, termlib termcap tinfo curses ncurses)
	AC_CHECK_FUNCS(putp tputs tgoto tgetstr tgetnum gotorc beep endwin setupterm printw)

	################################################################
	## Expat
	## Required for S3 and Digital Signatures
	##
	AC_ARG_WITH(expat,
	AS_HELP_STRING([--with-expat=PATH], [where libexpat is compiled (if it isn't installed); required for S3 and Digital Signatures]),
	[LDFLAGS="-L${with_expat} $LDFLAGS" ;
	CPPFLAGS="-I${with_expat}/lib $CPPFLAGS"])

	have_expat=yes
	AC_CHECK_HEADER([expat.h])
	AC_CHECK_LIB([expat],[XML_ParserCreate],,[have_expat="no ";AC_MSG_WARN([expat not found; S3 and Digital Signatures not enabled])])


	################################################################
	## Amazon S3
	## S3 requires curl and expat; otherwise we don't need them
	AC_ARG_ENABLE(s3,
	AC_HELP_STRING([--enable-s3=yes],
	[Support for Amazon's S3 service. Requires CURL and Expat.]),
	[enable_s3=$enableval], [enable_s3=no])

	if test "x${enable_s3}" = "xyes" ; then
	AC_MSG_NOTICE([S3 support requested. Looking for curl and expat...])
	AC_PATH_PROG(CURL_CONFIG,curl-config)
	AC_ARG_WITH(curl,
	AC_HELP_STRING([--with-curl=PATH], [where libcurl is installed; required for S3]),
	[CURL_CONFIG="${with_curl}/bin/curl-config"])
	AC_CHECK_HEADER([curl/curl.h],,
	AC_MSG_WARN([curl/curl.h not found; Disabling S3 Support.])
	enable_s3=no)
	AC_CHECK_LIB([curl],[curl_global_init],,
	AC_MSG_WARN([Curl library corrupt; Disabling S3 Support.])
	enable_s3=no)
	fi

	S3_BIN=
	if test "x${enable_s3}" = "xyes" ; then
	AC_DEFINE([USE_S3],1,[Enable support for Amazon S3])
	S3_BIN='s3$(EXEEXT)'
	fi
	AC_SUBST(S3_BIN)
	AM_CONDITIONAL([MAYBE_S3],[test "x${enable_s3}" = "xyes"]) # used by automake

	################################################################
	### QEMU
	################################################################

	AC_ARG_ENABLE([qemu])

	echo "disable_qemu: " ${disable_qemu}
	echo "enable_qemu: " ${enable_qemu}

	if test x"${cross_compiling}" = "xyes" ; then
	AC_MSG_NOTICE([cross-compiling: Disabling QEMU])
	enable_qemu="no";
	fi


	if test "x${enable_qemu}" = "xno" ; then
	enable_qemu="no"
	AC_DEFINE([DISABLE_QEMU],1,[User has disabled QEMU support])
	else
	AC_DEFINE([USE_QEMU],1,[Use QEMU image drivers])
	enable_qemu="yes"
	fi
	AM_CONDITIONAL([MAYBE_QEMU],[test "x${enable_qemu}" = "xyes"]) # used by automake


	################################################################
	### PyAFF
	################################################################
	# python checks
	# (requires autoconf 1.5+ and the macros in acinclude.m4)
	AC_ARG_ENABLE([python],
	AC_HELP_STRING([--enable-python=no], [Build python bindings (pyaff)]),
	[enable_python=$enableval], [enable_python=no])
	if test "${enable_python}" = "yes" ; then
	AM_PATH_PYTHON([2.5])
	AC_PYTHON_DEVEL()
	AC_DEFINE([HAVE_PYTHON],1,[Build Python bindings])
	fi

	AM_CONDITIONAL(HAVE_PYTHON, test "$enable_python" = yes)



	##
	################################################################
	################################################################
	## Crypto (must follow S3)
	## Note: -lssl is needed on Linux
	## -lcrypto is needed on MacOS
	## -lmd is needed on some older systems
	## Always check for headers, then libs, then functions
	###

	AC_CHECK_HEADERS([openssl/aes.h openssl/bio.h openssl/evp.h openssl/hmac.h openssl/md5.h openssl/rand.h openssl/rsa.h openssl/sha.h openssl/pem.h openssl/x509.h])


	AC_CHECK_LIB([ssl],[SSL_library_init],,
	AC_MSG_ERROR([OpenSSL developer library 'libssl-dev' or 'openssl-devel' not installed; cannot continue.]))

	AC_CHECK_LIB([crypto],[EVP_get_digestbyname])
	AC_CHECK_LIB([md],[MD5]) # if libmd is available, get it

	AC_CHECK_FUNCS([MD5 SHA1 AES_encrypt RAND_pseudo_bytes des_read_pw_string EVP_read_pw_string EVP_MD_size])
	AC_CHECK_FUNCS([PEM_read_bio_RSA_PUBKEY])

	################################################################
	## FUSE: Filesystem in Userspace
	AC_ARG_ENABLE(fuse,
	AC_HELP_STRING([--enable-fuse=yes],
	[Support for FUSE, Filesystem in Userspace. (default yes)]),
	[enable_fuse=$enableval], [enable_fuse=yes])
	if test "x${enable_fuse}" = "xyes" ; then
	AC_MSG_NOTICE([FUSE requested])
	CPPFLAGS="-D_FILE_OFFSET_BITS=64 -DFUSE_USE_VERSION=26 $CPPFLAGS"
	if test `uname -s` = Darwin ; then
	AC_MSG_NOTICE([FUSE IS NOT SUPPORTED ON MACOS])
	enable_fuse=no
	fi
	AC_CHECK_HEADER([fuse.h],,
	AC_MSG_NOTICE([fuse.h not found; Disabling FUSE support.])
	enable_fuse=no)
	AC_SUBST(FUSE_LIBS)
	AC_SUBST(FUSE_CFLAGS)
	fi
	AFFUSE_BIN=
	if test "${enable_fuse}" = "yes"; then
	AC_DEFINE([USE_FUSE],1,[Use FUSE to mount AFF images])
	AFFUSE_BIN='affuse$(EXEEXT)'
	FUSE_LIBS=-lfuse
	fi
	AC_SUBST(AFFUSE_BIN)
	AM_PROG_CC_C_O dnl for affuse
	##
	################################################################

	############## drop optimization flags if requeted ################

	if test x"${AFF_NOOPT}" != "x" ; then
	with_noopt="yes";
	fi

	if test "${with_noopt}" = "yes" ; then
	CFLAGS=`echo "$CFLAGS" \| sed s/-O[[0-9]]//` # note the double quoting!
	CXXFLAGS=`echo "$CXXFLAGS" \| sed s/-O[[0-9]]//`
	fi

	# I am a glutten for punishment and this is security-critical software
	CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2 -Wall -g"
	CXXFLAGS="$CXXFLAGS -D_FORTIFY_SOURCE=2 -Wall -g"


	################ drop threading if requested ################
	AC_ARG_ENABLE(threading,
	[ --disable-threading builds library without threading
	--enable-threading use threading if available])
	if test "x$disable_threading" != xno; then
	PTHREAD_CFLAGS=""
	PTHREAD_CXXFLAGS=""
	PTHREAD_LDFLAGS=""
	AC_DEFINE(DISABLE_PTHREAD,1,[User has disabled PTHREADING])
	fi
	AM_CONDITIONAL([THREADING], [test "x$enable_threading" != xno])

	###### Tell user what flags we have #######
	# see http://pre.plt-scheme.org/plt/src/mzscheme/configure.ac
	#
	AC_MSG_NOTICE([])
	AC_MSG_NOTICE([*****************************************])
	AC_MSG_NOTICE([AFFLIB ${PACKAGE_VERSION} configuration])
	AC_MSG_NOTICE([Amazon S3 Support: ${enable_s3}])
	AC_MSG_NOTICE([LZMA Compression: yes])
	AC_MSG_NOTICE([PYTHON Bindings: ${enable_python}])
	AC_MSG_NOTICE([QEMU Image Drivers: ${enable_qemu}])
	AC_MSG_NOTICE([FUSE: ${enable_fuse}])
	AC_MSG_NOTICE([LIBEXPAT: ${have_expat} (needed for AFF signatures)])
	AC_MSG_NOTICE([])
	AC_MSG_NOTICE([CFLAGS: ${CFLAGS}])
	AC_MSG_NOTICE([CPPFLAGS: ${CPPFLAGS}])
	AC_MSG_NOTICE([CXXFLAGS: ${CXXFLAGS}])
	AC_MSG_NOTICE([LIBS: ${LIBS}])
	AC_MSG_NOTICE([LDFLAGS: ${LDFLAGS}])
	AC_MSG_NOTICE([*****************************************])
	AC_MSG_NOTICE([])

	# AC_PROG_RANLIB not needed if you are using AC_PROG_LIBTOOL
	# AC_PROG_RANLIB
	AC_OUTPUT([afflib.pc])

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