sane-project-backends/configure.in

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dnl Process this file with autoconf to produce a configure script. -*-m4-*-
dnl ***********************************************************************
dnl When preparing a release, increase the numeric and string version numbers,
dnl remove the "-cvs" suffix, and set is_release=yes
AC_INIT([sane-backends],[1.0.17-cvs],[sane-devel@lists.alioth.debian.org])
V_MAJOR=1
V_MINOR=0
V_REV=17
is_release=no
dnl ***********************************************************************
AC_CONFIG_HEADERS([include/sane/config.h])
AC_PREREQ(2.54)dnl dnl Minimum Autoconf version required.
AC_ARG_PROGRAM
PACKAGE=AC_PACKAGE_NAME
VERSION=AC_PACKAGE_VERSION
NUMBER_VERSION=${V_MAJOR}.${V_MINOR}.${V_REV}
AC_DEFINE_UNQUOTED(PACKAGE, "$PACKAGE",
[Define to the name of the distribution.])
AC_DEFINE_UNQUOTED(VERSION, "$VERSION",
[Define to the version of the distribution.])
AC_DEFINE_UNQUOTED(SANE_DLL_V_MAJOR, $V_MAJOR, [SANE DLL major number])
AC_DEFINE_UNQUOTED(SANE_DLL_V_MINOR, $V_MINOR, [SANE DLL minor number])
AC_DEFINE_UNQUOTED(SANE_DLL_V_BUILD, $V_REV, [SANE DLL revision number])
AC_SUBST(V_MAJOR)
AC_SUBST(V_MINOR)
AC_SUBST(V_REV)
AC_SUBST(PACKAGE)
AC_SUBST(VERSION)
AC_SUBST(NUMBER_VERSION)
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
dnl no bloody way to have a decent --docdir...
AC_ARG_WITH(docdir,
AC_HELP_STRING([--with-docdir=DIR],
[documentation @<:@PREFIX/doc/sane-VERSION@:>@]),
[
docdir="${withval}"
AC_SUBST([docdir])dnl
], [
AC_SUBST([docdir], ['${prefix}/doc/sane-${VERSION}'])dnl
])
dnl ***********************************************************************
dnl Checks for programs.
dnl ***********************************************************************
AC_PROG_CC
AC_PROG_INSTALL
AC_PROG_MAKE_SET
AC_PROG_CPP
AC_PROG_GCC_TRADITIONAL
AC_PATH_PROG(SANE_CONFIG_PATH, sane-config, no)
AC_PATH_PROG(MSGFMT, msgfmt$EXEEXT, no)
AC_PATH_PROG(XGETTEXT, xgettext$EXEEXT, no)
AC_PATH_PROG(MSGMERGE, msgmerge$EXEEXT, no)
AC_PATH_PROG(LATEX, latex$EXEEXT, no)
AC_PATH_PROG(DVIPS, dvips$EXEEXT, no)
AC_PATH_PROG(MAKEINDEX, makeindex$EXEEXT, no)
AC_PATH_PROG(MAKEDEPEND, makedepend$EXEEXT, no)
AC_SUBST(MSGFMT)
AC_SUBST(XGETTEXT)
AC_SUBST(MSGMERGE)
AC_SUBST(LATEX)
AC_SUBST(DVIPS)
AC_SUBST(MAKEINDEX)
if test "$MAKEDEPEND" != "no"; then
DEPEND_RECURSIVE="depend-recursive"
fi
AC_SUBST(DEPEND_RECURSIVE)
dnl ***********************************************************************
dnl set compiler/linker flags
dnl ***********************************************************************
INCLUDES="${INCLUDES} -I/usr/local/include"
AC_SUBST(INCLUDES)
SANE_SET_CFLAGS([$is_release])
SANE_SET_LDFLAGS
SANE_LINKER_RPATH
dnl ***********************************************************************
dnl Checks for unix variants
dnl ***********************************************************************
AC_GNU_SOURCE
AC_AIX
AC_MINIX
AC_ISC_POSIX
dnl ***********************************************************************
dnl Checks for libraries
dnl ***********************************************************************
SANE_CHECK_DLL_LIB
dnl Checks for Backend libraries.
AC_CHECK_LIB(m,sqrt)
AC_CHECK_LIB(scsi, scsireq_enter) # FreeBSD needs this
AC_CHECK_LIB(cam, cam_open_device) # FreeBSD 3+ needs this
dnl IRIX sometimes has SYSVR3/4 network DSOs, but we do not need or want
dnl to use them!
if test "`uname`" != "IRIX" -a "`uname`" != "IRIX64"; then
AC_SEARCH_LIBS(gethostbyaddr, nsl bind)
AC_SEARCH_LIBS(socket, socket)
AC_SEARCH_LIBS(syslog, syslog be) # OS/2 needs -lsyslog, BeOS needs -lbe
fi
SANE_CHECK_JPEG
SANE_CHECK_TIFF
SANE_CHECK_IEEE1284
SANE_CHECK_PTHREAD
SANE_CHECK_LOCKING
SANE_CHECK_GPHOTO2
dnl check sane to make sure we don't have two installations
AC_CHECK_LIB(sane, sane_init, LIBSANE_EXISTS="yes")
dnl ***********************************************************************
dnl Checks for header files.
dnl ***********************************************************************
AC_HEADER_STDC
AC_CHECK_HEADERS(fcntl.h unistd.h libc.h sys/dsreq.h sys/select.h \
sys/time.h sys/shm.h sys/ipc.h sys/signal.h \
sys/scanio.h scsi.h sys/scsi.h sys/scsicmd.h sys/scsiio.h \
bsd/dev/scsireg.h scsi/sg.h /usr/src/linux/include/scsi/sg.h \
camlib.h os2.h sys/socket.h sys/io.h gscdds.h sys/hw.h \
sys/types.h sys/scsi/scsi.h sys/scsi/sgdefs.h sys/scsi/targets/scgio.h \
apollo/scsi.h sys/sdi_comm.h sys/passthrudef.h linux/ppdev.h \
dev/ppbus/ppi.h machine/cpufunc.h usb.h sys/bitypes.h sys/sem.h sys/poll.h \
IOKit/cdb/IOSCSILib.h IOKit/scsi-commands/SCSICommandOperationCodes.h \
windows.h be/kernel/OS.h be/drivers/USB_scanner.h limits.h sys/ioctl.h asm/types.h)
AC_CHECK_HEADERS([asm/io.h],,,[#include <sys/types.h>])
AC_CHECK_HEADERS([io/cam/cam.h],,,[#include <io/common/iotypes.h>])
SANE_CHECK_MISSING_HEADERS
AC_CHECK_HEADER(resmgr.h,[
AC_CHECK_LIB(
resmgr,
rsm_open_device,[
AC_DEFINE(HAVE_RESMGR,1,[define if you have the resmgr library])
LIBS="$LIBS -lresmgr"
]
)
])
AC_CHECK_HEADER(usbcalls.h,[
AC_DEFINE(HAVE_USBCALLS,1,[define if you have the usbcalls library])
LIBS="$LIBS -lusbcalls"
],,[
#include <usb.h>
#include <os2.h>])
dnl ***********************************************************************
dnl Checks for types and structures
dnl ***********************************************************************
AC_TYPE_SIGNAL
AC_TYPE_SIZE_T
AC_TYPE_PID_T
AC_CHECK_TYPE(ssize_t, long)
SANE_CHECK_U_TYPES
# from Python, check for "long long" type
AC_MSG_CHECKING(for long long support)
have_long_long=no
AC_TRY_COMPILE([], [long long x; x = (long long)0;], AC_DEFINE(HAVE_LONG_LONG, 1, [Define if the long long type is available.]) have_long_long=yes)
AC_MSG_RESULT($have_long_long)
if test "$ac_cv_header_sys_scsiio_h" = "yes" \
-a "$ac_cv_header_scsi_h" = "yes";
then
AC_TRY_COMPILE([
#include <sys/scsiio.h>
#include <scsi.h>
],[scsireq_t req],,
AC_DEFINE(scsireq_t, struct scsireq_t,
[Define scsireq_t as \`struct scsireq\' if necessary.]))
fi
AC_MSG_CHECKING([for socklen_t in <sys/socket.h>])
AC_TRY_COMPILE([
#include <sys/socket.h>
],[socklen_t len],AC_MSG_RESULT(yes),
[AC_MSG_RESULT(no); AC_DEFINE(socklen_t,int,
[Define socklen_t as \`int\' if necessary.])])
AC_MSG_CHECKING([for union semun in <sys/sem.h>])
AC_TRY_COMPILE([
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
],[union semun test_semun],[AC_MSG_RESULT(yes);
AC_DEFINE(HAVE_UNION_SEMUN,1,[Define if union semun is available.])],
AC_MSG_RESULT(no))
AC_MSG_CHECKING([for sg_header.target_status in <scsi/sg.h>])
AC_TRY_COMPILE([
#include <sys/types.h>
#include <scsi/sg.h>
],[
struct sg_header hdr;
hdr.target_status = 1;
return 0;
],[AC_MSG_RESULT(yes);
AC_DEFINE(HAVE_SG_TARGET_STATUS,1,[Define if sg_header.target_status is
available.])],
AC_MSG_RESULT(no))
AC_MSG_CHECKING([for struct flock in fcntl.h])
AC_EGREP_HEADER([struct flock], fcntl.h, [AC_MSG_RESULT(yes) ;
AC_DEFINE(HAVE_STRUCT_FLOCK, 1,
[Define if struct flock is available.])], AC_MSG_RESULT(no))
AC_MSG_CHECKING([for Linux ioctl defines])
AC_TRY_COMPILE([
#include <sys/ioctl.h>
#include <asm/types.h>
],[
__u32 houba = _IOR('v',14, unsigned long);
],[AC_MSG_RESULT(yes);
have_linux_ioctl_defines="yes";],AC_MSG_RESULT(no))
dnl ***********************************************************************
dnl Checks for compiler characteristics
dnl ***********************************************************************
AC_C_BIGENDIAN
AC_C_CONST
AC_C_INLINE
dnl ***********************************************************************
dnl Checks for library functions
dnl ***********************************************************************
if test "$ac_cv_header_be_kernel_OS_h" = "yes" ; then
dnl those are known to be broken in BeOS (BONE)
ac_cv_func_getaddrinfo=no
ac_cv_func_getnameinfo=no
fi
AC_FUNC_ALLOCA
AC_FUNC_MMAP
AC_CHECK_FUNCS(atexit inet_addr inet_aton inet_ntoa ioperm i386_set_ioperm mkdir \
scsireq_enter strftime strstr strtod \
cfmakeraw tcsendbreak strcasecmp strncasecmp _portaccess \
getaddrinfo getnameinfo poll setitimer iopl )
AC_REPLACE_FUNCS(getenv inet_ntop inet_pton isfdtype sigprocmask snprintf \
strdup strndup strsep usleep vsyslog)
SANE_PROTOTYPES
if test "$ac_cv_header_os2_h" = "yes" ; then
AC_DEFINE(strncasecmp, strnicmp, [Define for OS/2 only])
AC_DEFINE(strcasecmp, stricmp, [Define for OS/2 only])
fi
dnl On OS/2, libc knows getopt
AH_BOTTOM([
#ifdef __INNOTEK_LIBC__
#define ELIDE_CODE 1
#endif
])
dnl ***********************************************************************
dnl checks for system services
dnl ***********************************************************************
if test -c /dev/urandom ; then
AC_DEFINE(HAVE_DEV_URANDOM, 1, [Is /dev/urandom available?])
fi
dnl libusb on enabled by default (if found)
USE_LIBUSB=yes
AC_ARG_ENABLE(libusb,
AC_HELP_STRING([--disable-libusb],
[disable support for libusb]),
[
if eval "test x$enable_libusb = xno"; then
USE_LIBUSB=
fi
])
dnl we need both libusb header and a libusb providing usb_interrupt_read
if test "${ac_cv_header_usb_h}" = "yes" && test "$USE_LIBUSB" = "yes" ; then
AC_CHECK_LIB(usb, usb_interrupt_read)
if test "${ac_cv_lib_usb_usb_interrupt_read}" = "yes" ; then
HAVE_LIBUSB="yes"
fi
fi
dnl disable Linux SCSI generic version 3 to avoid 32/64 bit problems
if sparc64 -q > /dev/null 2>&1 ; then
AC_DEFINE(DISABLE_LINUX_SG_IO, 1, [Should we disable SCSI generic v3?])
fi
dnl check for IPv6 (can be overriden by --enable-ipv6)
if test "$ac_cv_func_getnameinfo" = "yes" \
&& test "$ac_cv_func_getaddrinfo" = "yes" ; then
SANE_CHECK_IPV6
else
ipv6="no"
fi
dnl ***********************************************************************
dnl initialize libtool
dnl ***********************************************************************
AC_LIBTOOL_WIN32_DLL
AC_DISABLE_STATIC
AC_PROG_LIBTOOL
dnl Windows/Cygwin needs this, else the library creation fails
dnl BeOS also needs this (why isnt it the default anyway ???)
if test "$ac_cv_header_windows_h" = "yes" -o "$ac_cv_header_be_kernel_OS_h" = "yes" ; then
LIBTOOL_LINK_EXTRA=-no-undefined
AC_SUBST(LIBTOOL_LINK_EXTRA)
fi
dnl Check for lock dir
AC_ARG_WITH(lockdir, AC_HELP_STRING([--with-lockdir=DIR],
[set SANE lockdir @<:@localstatedir/lock/sane@:>@]),
[locksanedir=$withval],[locksanedir=${localstatedir}/lock/sane])
AC_SUBST(locksanedir)
dnl ***********************************************************************
dnl enable/disable backends and features based on previous tests and user's
dnl choice
dnl ***********************************************************************
CPPFLAGS="${CPPFLAGS} -DPATH_SANE_CONFIG_DIR=\$(configdir) \
-DPATH_SANE_DATA_DIR=\$(datadir) \
-DPATH_SANE_LOCK_DIR=\$(locksanedir) \
-DV_MAJOR=${V_MAJOR} -DV_MINOR=${V_MINOR}"
if test "${ac_cv_header_sys_socket_h}" = "no"; then
echo "*** disabling saned (sys/socket.h not found)"
SANED=
else
SANED=saned
fi
AC_SUBST(SANED)
dnl These are the backends that are build in any case:
AC_ARG_ENABLE(local-backends,
AC_HELP_STRING([--disable-local-backends],
[turn off compilation of all backends but net]))
if eval "test x$enable_local_backends = xno"; then
BACKENDS="net"
else
if test "${BACKENDS}" != "" ; then
AC_MSG_NOTICE([Manually selected backends: ${BACKENDS}])
else
BACKENDS="abaton agfafocus apple artec as6e avision bh canon \
canon630u coolscan coolscan2 dc25 dmc \
epson fujitsu genesys gt68xx hp leo lexmark matsushita microtek \
microtek2 mustek mustek_usb nec pie pixma plustek \
plustek_pp ricoh s9036 sceptre sharp \
sp15c st400 tamarack test teco1 teco2 teco3 umax umax_pp umax1220u \
artec_eplus48u ma1509 ibm hp5400 u12 snapscan niash sm3840 hp4200 \
sm3600 hp3500 stv680"
if test "${sane_cv_use_libjpeg}" != "yes"; then
echo "*** disabling DC210 backend (failed to find JPEG library)"
echo "*** disabling DC240 backend (failed to find JPEG library)"
else
BACKENDS="${BACKENDS} dc210 dc240"
SANEI_JPEG="sanei_jpeg.o"
SANEI_JPEG_LO="sanei_jpeg.lo"
fi
AC_SUBST(SANEI_JPEG)
AC_SUBST(SANEI_JPEG_LO)
if test "${sane_cv_use_libieee1284}" != "yes"
then
echo "*** disabling CANON_PP backend (failed to find libieee1284 library)"
echo "*** disabling HPSJ5S backend (failed to find libieee1284 library)"
else
BACKENDS="${BACKENDS} canon_pp hpsj5s"
fi
if test "${sane_cv_use_libieee1284}" != "yes" && test "${enable_parport_directio}" != "yes"
then
echo "*** disabling MUSTEK_PP backend (failed to find libieee1284 library"
echo "*** and parport-directio is disabled)"
else
BACKENDS="${BACKENDS} mustek_pp"
fi
if test "${sane_cv_use_libjpeg}" != "yes" || test "${sane_cv_use_libtiff}" != "yes"
then
echo "*** disabling DELL1600N_NET backend (failed to find jpeg and/or tiff library"
else
BACKENDS="${BACKENDS} dell1600n_net"
fi
if test "${HAVE_GPHOTO2}" != "true" \
-o "${sane_cv_use_libjpeg}" != "yes"; then
echo "*** disabling GPHOTO2 backend (not requested, or failed to find required libraries)"
else
BACKENDS="${BACKENDS} gphoto2"
fi
if test "${ac_cv_header_sys_scanio_h}" = "no"; then
echo "*** disabling PINT backend (sys/scanio.h not found)"
else
BACKENDS="${BACKENDS} pint"
fi
if test "${ac_cv_func_ioperm}" = "no" \
&& test "${ac_cv_func__portaccess}" = "no"
then
echo "*** disabling qcam backend (ioperm or portaccess not found)"
else
BACKENDS="${BACKENDS} qcam"
fi
if test "${have_linux_ioctl_defines}" != "yes"
then
echo "*** disabling v4l (Video for Linux) backend"
else
BACKENDS="${BACKENDS} v4l"
fi
if test "${ac_cv_header_sys_socket_h}" = "no"; then
echo "*** disabling net backend (sys/socket.h not found)"
else
BACKENDS="${BACKENDS} net"
fi
if test "${have_pthread}" != "yes"; then
echo "*** disabling MUSTEK_USB2 backend (failed to find pthread library)"
else
BACKENDS="${BACKENDS} mustek_usb2"
fi
AC_ARG_ENABLE(pnm-backend,
AC_HELP_STRING([--enable-pnm-backend],
[enable the pnm backend for testing frontends (possible
security risk, see PROBLEMS file)]),
[
BACKENDS="${BACKENDS} pnm"
], [
echo "*** disabling pnm backend (not selected manually)"
])
fi
fi
AC_SUBST(BACKENDS)
if test "${enable_shared}" = "no"; then
enable_preload=yes
fi
if test "${enable_dynamic}" != yes || test "${enable_preload}" = "yes"; then
echo "preloading backends into DLL"
DLL_PRELOAD="\$(PRELOADABLE_BACKENDS)"
else
DLL_PRELOAD=""
fi
AC_SUBST(DLL_PRELOAD)
dnl in BeOS, backends are not installed in lib/sane, but add-ons/SANE/
dnl we account for both installing in /boot/beos and ~/config
dnl faster than: if test "`uname`" = "BeOS" -o "`uname`" = "Zeta" ; then
if test "$ac_cv_header_be_kernel_OS_h" = "yes" ; then
BEOS_ADDONDIR="${libdir}/../add-ons/SANE"
AC_SUBST(BEOS_ADDONDIR)
BE_INSTALL_FLAVOR=-beos
AC_SUBST(BE_INSTALL_FLAVOR)
fi
AC_ARG_ENABLE(scsibuffersize,
AC_HELP_STRING([--enable-scsibuffersize=N],
[specify the default size in bytes of the buffer for SCSI
commands [[default=131072]]]),
[set_scsibuffersize="$enableval"], [set_scsibuffersize=131072])
AC_DEFINE_UNQUOTED(SCSIBUFFERSIZE, $set_scsibuffersize,
[SCSI command buffer size])
echo "scsi buffersize: $set_scsibuffersize"
AC_ARG_ENABLE(scsi-directio,
AC_HELP_STRING([--enable-scsi-directio],
[enable SCSI direct IO (Linux only, dangerous, see
README.linux)]),
[
if eval "test x$enable_scsi_directio = xyes"; then
CFLAGS="$CFLAGS -DENABLE_SCSI_DIRECTIO"
fi
])
AC_ARG_ENABLE(parport-directio,
AC_HELP_STRING([--enable-parport-directio],
[enable direct hardware access to the parallel port, so
frontends will require special permission level]),
[
if eval "test x$enable_parport_directio = xyes"; then
CFLAGS="$CFLAGS -DENABLE_PARPORT_DIRECTIO"
fi
])
AC_ARG_ENABLE(translations,
AC_HELP_STRING([--disable-translations],
[don't install translations of backend options]),
[
if eval "test x$enable_translations = xno"; then
INSTALL_TRANSLATIONS=
else
INSTALL_TRANSLATIONS=install-translations
fi
],
INSTALL_TRANSLATIONS=install-translations
)
if eval "test x$INSTALL_TRANSLATIONS = xinstall-translations" ; then
if test x$MSGFMT = xno || test x$XGETTEXT = xno || test $MSGMERGE = no ; then
INSTALL_TRANSLATIONS=
echo "disabling translations (missing msgfmt, xgettext or msgmerge)"
else
echo "enabling translations"
fi
else
echo "disabling translations"
fi
AC_SUBST(INSTALL_TRANSLATIONS)
if test "$LATEX" != "no" && test "$DVIPS" != "no" && test "$MAKEINDEX" != "no" ; then
USE_LATEX="yes"
else
USE_LATEX="no"
fi
AC_SUBST(USE_LATEX)
dnl ***********************************************************************
dnl Write output files
dnl ***********************************************************************
DISTCLEAN_FILES="*~ .*~ *.log *.bak *.old *.orig *.out *.rej \"\#\"* \".\\#\"*"
AC_SUBST(DISTCLEAN_FILES)
AC_CONFIG_FILES([Makefile lib/Makefile sanei/Makefile frontend/Makefile \
japi/Makefile backend/Makefile include/Makefile doc/Makefile \
po/Makefile testsuite/Makefile tools/Makefile doc/doxygen-sanei.conf])
AC_CONFIG_FILES([tools/sane-config], [chmod a+x tools/sane-config])
AC_OUTPUT
dnl ***********************************************************************
dnl print configuration information
dnl ***********************************************************************
echo "-> Variables used for compilation/linking:"
echo CPPFLAGS=\"${CPPFLAGS}\"
echo CFLAGS=\"${CFLAGS}\"
echo LDFLAGS=\"${LDFLAGS}\"
echo LIBS=\"${LIBS}\"
echo "-> Installation directories:"
echo "Configuration: `eval eval echo ${sysconfdir}`"
echo "Libraries: `eval eval echo ${libdir}`"
echo "Binaries: `eval eval echo ${bindir}` and `eval eval echo ${sbindir}`"
echo "Manpages: `eval eval echo ${mandir}`"
echo "Documentation: `eval eval echo ${docdir}`"
if eval "test x$INSTALL_LOCKPATH = xinstall-lockpath" ; then
echo "Lockfiles: `eval eval echo ${locksanedir}`"
else
echo "Lockfiles: Feature is disabled!"
fi
echo "-> Network parameters:"
if test "${SANED}" = "saned" ; then
echo "Build saned: yes"
else
echo "Build saned: no"
fi
echo "IPv6 support: `eval eval echo ${ipv6}`"
echo "-> The following backends will be built:"
for backend in ${BACKENDS} ; do
echo $ECHO_N "${backend} "
done
echo
if test "$SANE_CONFIG_PATH" != "no" ; then
SANE_INSTALLED_VERSION=`$SANE_CONFIG_PATH --version`
SANE_INSTALLED_PREFIX=`$SANE_CONFIG_PATH --prefix`
if test "$SANE_INSTALLED_PREFIX" != "$prefix" ; then
echo "*** WARNING: SANE is already installed (version $SANE_INSTALLED_VERSION). The old"
echo "*** installation is at $SANE_INSTALLED_PREFIX while SANE will now be installed"
echo "*** at $prefix. It is recommended to uninstall the old SANE version"
echo "*** before installing the new one to avoid problems."
fi
else
if test "$LIBSANE_EXISTS" = "yes" ; then
echo "*** Warning: An old version of SANE was detected but the sane-config program"
echo "*** couldn't be found. If you encounter any problems with SANE remove the old"
echo "*** SANE files and reinstall this version."
fi
fi
if eval "test x${sysconfdir} = x/usr/etc" ; then
echo "*** WARNING: Configuration files are stored in /usr/etc. If this is not"
echo "*** intended, use --sysconfdir to set another path (e.g. "/etc")."
fi
if test "$SELECTED_BACKENDS" != "" ; then
echo "*** Warning: Local backends have been disabled. This means that scanners"
echo "*** connected to your local computer won't be supported. Only a network"
echo "*** connection to a remote host is possible."
fi
if test "$HAVE_LIBUSB" != "yes" && test "$USE_LIBUSB" = "yes" ; then
echo "*** Warning: sane-backends will be built without libusb support. There may"
echo "*** be valid reasons to do so, e.g. if you don't use USB scanners or on"
echo "*** platforms without libusb support but generally this means that you"
echo "*** can't use USB devices with SANE. The most probable cause is that"
if test "${ac_cv_header_usb_h}" != "yes"; then
echo "*** the libusb header file usb.h is not installed. If you use Linux"
echo "*** you may need a package called 'libusb-dev', 'libusb-devel' or similar."
else
echo "*** libusb is not installed at all or is too old. See README."
fi
fi
echo "****************************************************************"
echo "* Please be sure to read file PROBLEMS in this directory *"
echo "* BEFORE running any of the SANE applications. Some devices *"
echo "* may be damaged by inproper operation, so please do heed this *"
echo "* advice. *"
echo "****************************************************************"