We leave some directories after running make uninstall:

% make install && make uninstall
...
% cd install && find *                                 
bin
etc
etc/dillo
lib
lib/dillo
lib/dillo/dpi
lib/dillo/dpi/downloads
lib/dillo/dpi/file
lib/dillo/dpi/hello
lib/dillo/dpi/datauri
lib/dillo/dpi/cookies
lib/dillo/dpi/ftp
lib/dillo/dpi/bookmarks
lib/dillo/dpi/vsource
share
share/applications
share/icons
share/icons/hicolor
share/icons/hicolor/48x48
share/icons/hicolor/48x48/apps
share/icons/hicolor/128x128
share/icons/hicolor/128x128/apps
share/man
share/man/man1
share/doc
share/doc/dillo

Reported by koutsie via IRC.