Source
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--- Makefile.orig
+++ Makefile
OPAMINSTALLER_FLAGS = --prefix "$(DESTDIR)$(prefix)"
OPAMINSTALLER_FLAGS += --mandir "$(DESTDIR)$(mandir)"
+OPAMINSTALLER_FLAGS += --docdir "$(DESTDIR)$(prefix)/share/doc"
# With ocamlfind, prefer to install to the standard directory rather
# than $(prefix) if there are no overrides