aclocal 1.9.5 is generating the following warning for gnucash 1.8.9: /usr/share/aclocal/gnucash.m4:9: warning: underquoted definition of AM_PATH_GNUCASH
Created attachment 58599 [details, diff] patch fixes the warning
these warnings are not fatal and as foser has said in other reports -- these things will get changed upstream, etc.