AC_INIT(Makefile.in)

rm -f config.build-subdirs

. $srcdir/GUILE-VERSION

all_subdirs=`cat $srcdir/*/PLUGIN/REQ $srcdir/*/PLUGIN/OPT /dev/null | tsort | xargs echo`
req_subdirs=`cat $srcdir/*/PLUGIN/REQ /dev/null | tsort | xargs echo`
opt_subdirs=`cat $srcdir/*/PLUGIN/OPT /dev/null | tsort | xargs echo`

AC_CONFIG_SUBDIRS($all_subdirs)
existingdirs=
for d in $all_subdirs; do
  if test -d $srcdir/$d ; then
    existingdirs="$existingdirs $d"
    if test "x$verbose" = xyes; then
       if test -f $srcdir/$d/PLUGIN/greet ; then
	  cat $srcdir/$d/PLUGIN/greet
       else
	 echo ===
	 echo === Configuring plug-in component $d
	 echo ===
       fi
    fi
  fi
done

for d in $req_subdirs; do
  if test ! -d $srcdir/$d ; then
    echo "*******"
    echo "*******"
    echo "**\+/**"
    echo "**=*=**" ERROR: Missing required package: $d
    echo "**/+\**"
    echo "*******"
    echo "*******"
    exit 1
  fi
done

if test "x$verbose" = xyes; then
  for d in $opt_subdirs; do
    if test ! -d $srcdir/$d ; then
      echo "*****"
      echo "*===*"
      echo "*=*=*" WARNING: Missing suggested package: $d
      echo "*===*"
      echo "*****"
    fi
  done
fi


AC_PROG_CC

### build_subdirs is the list of directories we actually want to
### build.  It's not equivalent to existingdirs: if we can't find the
### Tcl libraries, then we don't want to build in gtcltk-lib.
###
### So why can't we just forget about gtcltk-lib altogether, and
### delete it from existingdirs, in that case?  Well, in order for
### 'make dist' to work, we still need to configure gtcltk-lib, and
### the top-level Makefile needs to know it exists,
build_subdirs="${existingdirs}"

### Decide which directories to build; remove the ones we don't want
### from build_subdirs.

### On some systems, the Tcl library contains references to
### functions in the dynamic linker library, -ldl, so we may need
### to include that.
AC_CHECK_LIB(dl, dlopen)

### Use gtcltk-lib only if we seem to have Tcl installed on the
### system.  We really should check for Tk as well, but that involves
### finding all the X libraries that we need to do a complete link.
AC_CHECK_LIB(tcl7.5, Tcl_CreateInterp, have_tcl=true, have_tcl=false, -lm)
if $have_tcl; then :; else
  build_subdirs="`echo $build_subdirs | sed s:gtcltk-lib::`"
  req_subdirs="`echo $req_subdirs | sed s:gtcltk-lib::`"
fi  

### Write the list of survivors, the directories we do want to build,
### to a file in the top level, so the subdirectories' configuration
### scripts can find it.  We don't want to pass the list in the
### environment, because the subdirectory configuration scripts can be
### run on their own.
echo "${build_subdirs}" > config.build-subdirs

AC_SUBST(existingdirs)
AC_SUBST(build_subdirs)
AC_SUBST(GUILE_VERSION)
AC_OUTPUT(Makefile doc/Makefile)