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# gp-manual-graphviz.m4 - look for graphviz dot tool; check it -*- Autoconf -*-
# serial 13
dnl | Increment the above serial number every time you edit this file.
dnl | When it finds multiple m4 files with the same name,
dnl | aclocal will use the one with the highest serial.
dnl
dnl ---------------------------------------------------------------------------
dnl dot: This program is needed for processing images. If not found,
dnl documentation can still be built, but without figures.
dnl ---------------------------------------------------------------------------
AC_DEFUN([GP_CHECK_DOT],
[
try_dot=true
have_dot=false
AC_ARG_WITH(dot, AS_HELP_STRING([--without-dot], [Do not use dot]), [
if test "x$withval" = "xno"; then
try_dot=false
fi])
if $try_dot; then
AC_PATH_PROG(DOT,dot)
if test -n "${DOT}"; then
have_dot=true
fi
fi
if $have_dot; then
AC_SUBST(DOT)
AC_MSG_CHECKING([whether ${DOT} works])
${DOT} -Tps -o tesseract.ps 2> /dev/null <<EOF
graph tesseract {
node [[shape=point]];
o -- {a;b;c;d;}
a -- {ab;ac;ad;}
b -- {ab;bc;bd;}
c -- {ac;bc;cd;}
d -- {ad;bd;cd;}
ab -- {abc;abd;}
ac -- {abc;acd;}
ad -- {abd;acd;}
bc -- {abc;bcd;}
bd -- {abd;bcd;}
cd -- {acd;bcd;}
{abc;abd;acd;bcd;} -- abcd;
}
EOF
if test $? != 0 || test ! -f tesseract.ps; then
have_dot=false
AC_MSG_RESULT([no (see http://www.graphviz.org/ ...)])
else
AC_MSG_RESULT(yes)
fi
fi
AM_CONDITIONAL(ENABLE_GRAPHS, $have_dot)
])
dnl
dnl
dnl ####################################################################
dnl
dnl Local Variables:
dnl mode: autoconf
dnl End:
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