--- a/doc/make_doc
+++ b/doc/make_doc
@@ -1,10 +1,11 @@
 #!/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 cryst . ../htm
+export GAP_CONVERT_DATE="December 2019"
+/usr/share/gap/etc/convert.pl -c -i -u -n cryst . ../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}
 \Package{CaratInterface}
@@ -33,7 +33,7 @@
   \bigskip
 
   \bigskip
-  \centerline{\secfont{\Month} \Year}
+  \centerline{\secfont{December} 2019}
 
   \vfill
   \centerline{Copyright {\copyright} 1999--2019 by 
