+AC_SUBST(GS920)
+AC_SUBST(EXTRACTPDFMARK)
+AC_SUBST(USE_EXTRACTPDFMARK)
+STEPMAKE_PROGS(GS920, gs, OPTIONAL, 9.20)
+STEPMAKE_PROGS(EXTRACTPDFMARK, extractpdfmark, OPTIONAL)
+req=`STEPMAKE_NUMERIC_VERSION(9.20)`
+USE_EXTRACTPDFMARK=yes
+if test "$GS920_VERSION" -lt "$req"; then
+ GS920=
+ USE_EXTRACTPDFMARK=no
+fi
+if test "$EXTRACTPDFMARK" != "extractpdfmark"; then
+ EXTRACTPDFMARK=
+ USE_EXTRACTPDFMARK=no
+fi
+if test "$USE_EXTRACTPDFMARK" != "yes"; then
+ STEPMAKE_ADD_ENTRY(OPTIONAL,
+ ["(Optionally using Ghostscript >= 9.20 together with"])
+ STEPMAKE_ADD_ENTRY(OPTIONAL,
+ [" Extract PDFmark can significantly reduce the disk space required"])
+ STEPMAKE_ADD_ENTRY(OPTIONAL,
+ [" for building the documentation and the final PDF files.)"])
+fi
+