+# Check for the XSHM server extension header.
+#
+have_xshm=no
+with_xshm_req=unspecified
+AC_ARG_WITH(xshm-ext,
+[ --with-xshm-ext Include support for the XSHM (Shared Memory) server
+ extension, if possible (this is the default).
+ --without-xshm-ext Do not compile in support for this extension.],
+ [with_xshm="$withval"; with_xshm_req="$withval"],[with_xshm=yes])
+
+HANDLE_X_PATH_ARG(with_xshm, --with-xshm-ext, XSHM)
+
+if test "$with_xshm" = yes; then
+
+ # first check for Xshm.h.
+ AC_CHECK_X_HEADER(X11/extensions/XShm.h, [have_xshm=yes])
+
+ # if that succeeded, then check for sys/ipc.h.
+ if test "$have_xshm" = yes; then
+ have_xshm=no
+ AC_CHECK_X_HEADER(sys/ipc.h, [have_xshm=yes])
+ fi
+
+ # if that succeeded, then check for sys/shm.h.
+ if test "$have_xshm" = yes; then
+ have_xshm=no
+ AC_CHECK_X_HEADER(sys/shm.h, [have_xshm=yes])
+ fi
+
+ # AIX is pathological, as usual: apparently it's normal for the Xshm headers
+ # to exist, but the library code to not exist. And even better, the library
+ # code is in its own library: libXextSam.a. So, if we're on AIX, and that
+ # lib doesn't exist, give up.
+ #
+ case "$host" in
+ *-aix*)
+ have_xshm=no
+ AC_CHECK_X_LIB(XextSam, XShmQueryExtension,
+ [have_xshm=yes; SAVER_LIBS="$SAVER_LIBS -lXextSam"],
+ [], -lX11 -lXext -lm)
+ ;;
+ esac
+
+ # if that succeeded, then we've really got it.
+ if test "$have_xshm" = yes; then
+ AC_DEFINE(HAVE_XSHM_EXTENSION)
+ fi
+
+elif test "$with_xshm" != no; then
+ echo "error: must be yes or no: --with-xshm-ext=$with_xshm"
+ exit 1
+fi
+
+
+# Check for the DOUBLE-BUFFER server extension header.
+#
+have_xdbe=no
+with_xdbe_req=unspecified
+AC_ARG_WITH(xdbe-ext,
+[ --with-xdbe-ext Include support for the DOUBLE-BUFFER server
+ extension, if possible (this is the default).
+ --without-xdbe-ext Do not compile in support for this extension.],
+ [with_xdbe="$withval"; with_xdbe_req="$withval"],[with_xdbe=yes])
+
+HANDLE_X_PATH_ARG(with_xdbe, --with-xdbe-ext, DOUBLE-BUFFER)
+
+if test "$with_xdbe" = yes; then
+
+ AC_CHECK_X_HEADER(X11/extensions/Xdbe.h, [have_xdbe=yes])
+ if test "$have_xdbe" = yes; then
+ AC_DEFINE(HAVE_DOUBLE_BUFFER_EXTENSION)
+ fi
+
+elif test "$with_xdbe" != no; then
+ echo "error: must be yes or no: --with-xdbe-ext=$with_xshm"
+ exit 1
+fi
+
+
+# Check for the SGI-VIDEO-CONTROL server extension header.
+#
+have_sgivc=no
+with_sgivc_req=unspecified
+AC_ARG_WITH(sgivc-ext,
+[ --with-sgivc-ext Include support for the SGI-VIDEO-CONTROL server
+ extension, if possible (this is the default).
+ --without-sgivc-ext Do not compile in support for this extension.],
+ [with_sgivc="$withval"; with_sgivc_req="$withval"],[with_sgivc=yes])
+
+HANDLE_X_PATH_ARG(with_sgivc, --with-sgivc-ext, SGI-VIDEO-CONTROL)
+
+if test "$with_sgivc" = yes; then
+
+ # first check for XSGIvc.h
+ AC_CHECK_X_HEADER(X11/extensions/XSGIvc.h, [have_sgivc=yes])
+
+ # if that succeeded, then check for the -lXsgivc
+ if test "$have_sgivc" = yes; then
+ have_sgivc=no
+ AC_CHECK_X_LIB(Xsgivc, XSGIvcQueryGammaMap,
+ [have_sgivc=yes; SAVER_LIBS="$SAVER_LIBS -lXsgivc"], [],
+ -lXext -lX11)
+ fi
+
+ # if that succeeded, then we've really got it.
+ if test "$have_sgivc" = yes; then
+ AC_DEFINE(HAVE_SGI_VC_EXTENSION)
+ fi
+
+elif test "$with_sgivc" != no; then
+ echo "error: must be yes or no: --with-sgivc-ext=$with_sgivc"
+ exit 1
+fi
+
+
+# Check for the DPMS server extension header.
+#
+have_dpms=no
+with_dpms_req=unspecified
+AC_ARG_WITH(dpms-ext,
+[ --with-dpms-ext Include support for the DPMS server extension,
+ if possible (this is the default).
+ --without-dpms-ext Do not compile in support for this extension.],
+ [with_dpms="$withval"; with_dpms_req="$withval"],[with_dpms=yes])
+
+HANDLE_X_PATH_ARG(with_dpms, --with-dpms-ext, DPMS)
+
+if test "$with_dpms" = yes; then
+
+ # first check for dpms.h
+ AC_CHECK_X_HEADER(X11/extensions/dpms.h, [have_dpms=yes])
+
+ # if that succeeded, then check for the -lXdpms
+ if test "$have_dpms" = yes; then
+ have_dpms=no
+ AC_CHECK_X_LIB(Xdpms, DPMSInfo,
+ [have_dpms=yes; SAVER_LIBS="$SAVER_LIBS -lXdpms"], [],
+ -lXext -lX11)
+ fi
+
+ # if that succeeded, then we've really got it.
+ if test "$have_dpms" = yes; then
+ AC_DEFINE(HAVE_DPMS_EXTENSION)
+ fi
+
+elif test "$with_dpms" != no; then
+ echo "error: must be yes or no: --with-dpms-ext=$with_dpms"
+ exit 1
+fi
+
+
+# Check for /proc/interrupts
+#
+have_proc_interrupts=no
+with_proc_interrupts_req=unspecified
+AC_ARG_WITH(proc-interrupts,
+[ --with-proc-interrupts Include support for consulting the /proc/interrupts
+ file to notice keyboard activity, if possible.
+ --without-proc-interrupts Do not compile in support for this method.],
+ [with_proc_interrupts="$withval"; with_proc_interrupts_req="$withval"],
+ [with_proc_interrupts=yes])
+
+if test "$with_proc_interrupts" = yes; then
+
+ AC_MSG_CHECKING(whether /proc/interrupts contains keyboard data)
+ AC_CACHE_VAL(ac_cv_have_proc_interrupts,
+ [ac_cv_have_proc_interrupts=no
+ if grep keyboard /proc/interrupts >/dev/null 2>&1 ; then
+ ac_cv_have_proc_interrupts=yes
+ fi
+ ])
+ have_proc_interrupts=$ac_cv_have_proc_interrupts
+
+ AC_MSG_RESULT($have_proc_interrupts)
+
+ if test "$have_proc_interrupts" = yes; then
+ AC_DEFINE(HAVE_PROC_INTERRUPTS)
+ fi
+
+elif test "$with_proc_interrupts" != no; then
+ echo "error: must be yes or no: --with-proc-interrupts=$with_proc_interrupts"
+ exit 1
+fi
+
+
+