aclocal 1.9.5 is generating the following warning for gtk+ 1.2.10-r11: /usr/share/aclocal/gtk.m4:7: warning: underquoted definition of AM_PATH_GTK
Created attachment 58595 [details, diff] patch fixes the warning
These are harmless warnings for unmaintained old versions and patching would just be a lot of effort for no gain.