* m4/gspnlib.m4: New file.

* configure.ac: Call AX_CHECK_GSPNLIB.
* Makefile.am (EXTRA_DIST): Add m4/gspnlib.m4.
* iface/gspn/Makefile.am (AM_CPPFLAGS): Add $(LIBGSPN_CPPFLAGS).
(libspotgspn_la_LIBADD, check_PROGRAMS, dottygspn_SOURCES,
dottygspn_LDADD): New variables.
* iface/gspn/gspn.hh (gspn_interface): New class.
(gspn_exeption): Take a string argument and adjust all callers.
(operator<<): Define for gspn_exeption.
* iface/gspn/gspn.cc (gspn_interface::gspn_interface,
gspn_interface::~gspn_interface): New.
* iface/gspn/gspnlib.h: Delete, it belongs to GSPN.
* iface/gspn/dottygspn.cc: New file.

m4/gspnlin.m4

@@ -0,0 +1,29 @@
+AC_DEFUN([AX_CHECK_GSPNLIB], [
+  AC_ARG_WITH([gspn],
+	      [AC_HELP_STRING([--with-gpsn=/root/of/greatspn],
+			      [build interface with GreadSPN])])
+  if test x${with_gspn-no} != xno; then
+    ax_tmp_LDFLAGS=$LDFLAGS
+    ax_tmp_LIBS=$LIBS
+    LIBGSPN_LDFLAGS=
+    if test x${with_gspn-yes} != xyes; then
+       # Try to locate the headers and libraries.
+       gspn_version_sh=$with_gspn/SOURCES/contrib/version.sh;
+       AC_CHECK_FILE($gspn_version_sh,, 
+         [AC_MSG_ERROR(
+            [Cannot find $gspn_version_sh.  Check --with-gspn's argument.])])
+       gspn_version=`$gspn_version_sh`
+       LIBGSPN_LDFLAGS="-L$with_gspn/$gspn_version/2bin/lib"
+       LIBGSPN_CPPFLAGS="-I$with_gspn/SOURCES/WN/INCLUDE"
+    fi
+     LDFLAGS="$LDFLAGS $LIBGSPN_LDFLAGS"
+     AC_CHECK_LIB([gspnRG], [initialize], [], 
+	[AC_MSG_ERROR([Cannot find libgspnRG.  Check --with-gspn's argument.])],        [-lm -lfl])
+     LIBGSPN_LDFLAGS="$LIBGSPN_LDFLAGS -lgspnRG -lm -lfl"
+     LDFLAGS="$ax_tmp_LDFLAGS"
+     LIBS="$ax_tmp_LIBS"
+  fi
+  AM_CONDITIONAL([WITH_GSPN], [test x${with_gspn+set} = xset])
+  AC_SUBST([LIBGSPN_CPPFLAGS])
+  AC_SUBST([LIBGSPN_LDFLAGS])
+])