--- a/doc/make_doc
+++ b/doc/make_doc
@@ -1,9 +1,10 @@
 #!/bin/sh
 rm -f manual.aux manual.dvi manual.idx manual.ilg manual.ind manual.lab manual.log manual.six manual.toc
 tex manual
-../../../etc/manualindex manual
+/usr/share/gap/etc/manualindex manual
 tex manual
 mkdir -p ../htm
-../../../etc/convert.pl -c -i -u -n crystcat . ../htm
+export GAP_CONVERT_DATE="May 2019"
+/usr/share/gap/etc/convert.pl -c -i -u -n crystcat . ../htm
 dvips -o manual.ps manual
 ps2pdf manual.ps manual.pdf
--- a/doc/manual.tex
+++ b/doc/manual.tex
@@ -1,4 +1,4 @@
-\input ../../../etc/gapmacro.tex
+\input /usr/share/gap/etc/gapmacro.tex
 \Package{Cryst}
 \Package{CrystCat}
 
@@ -39,7 +39,7 @@
   \centerline{\tt gaehler@math.uni-bielefeld.de}
   \vfill
 
-  \centerline{\secfont{\Month} \Year}
+  \centerline{\secfont{May} 2019}
 
   \vfill
   \centerline{Copyright {\copyright} 1999 by 
