+@knownissues
+
+You may also need to create a script for @command{pngtopnm} and
+@code{pnmtopng}. On Linux, I use this:
+
+@verbatim
+export LD_LIBRARY_PATH=/usr/lib
+exec /usr/bin/pngtopnm "$@"
+@end verbatim
+
+On MacOS@tie{}X, I use this:
+
+@verbatim
+export DYLD_LIBRARY_PATH=/sw/lib
+exec /sw/bin/pngtopnm "$@"
+@end verbatim
+
+In order to force make to build a complete manual (this does not
+rebuild all examples, only things which are changed), I recommend
+writing a script like this:
+
+@verbatim
+### run from Documentation/user/
+# possibly required on OS X and/or old texinfo
+# ulimit -n 4096
+if [ -e out-www/lilypond.texi ]; then rm out-www/lilypond.* ; fi;
+if [ -e out-www/lilypond-program.texi ]; then rm
+out-www/lilypond-program.* ; fi;
+if [ -e out-www/lilypond-learning.texi ]; then rm
+out-www/lilypond-learning.* ; fi;
+nice make LILYPOND_EXTERNAL_BINARY=~/usr/bin/lilypond web
+@end verbatim
+
+To rebuild the complete HTML docs, run the above script from the
+@file{Documentation/user/} directory, then run the final line (the
+@code{nice make}) from the top source dir.
+
+