--- reposurgeon-4.27/Makefile.orig	2021-06-01 13:39:31.000000000 -0700
+++ reposurgeon-4.27/Makefile	2021-06-01 13:40:22.000000000 -0700
@@ -4,6 +4,7 @@
 INSTALL=install
 prefix?=/usr/local
 mandir?=share/man
+docdir?=share/doc/reposurgeon
 target=$(DESTDIR)$(prefix)
 
 META = README.adoc INSTALL.adoc NEWS.adoc COPYING
@@ -277,10 +278,10 @@
 #
 install:
 	$(INSTALL) -d "$(target)/bin"
-	$(INSTALL) -d "$(target)/share/doc/reposurgeon"
+	$(INSTALL) -d "$(target)/$(docdir)"
 	$(INSTALL) -d "$(target)/$(mandir)/man1"
 	$(INSTALL) -m 755 $(INSTALLABLES) "$(target)/bin"
-	$(INSTALL) -m 644 $(SHARED) "$(target)/share/doc/reposurgeon"
+	$(INSTALL) -m 644 $(SHARED) "$(target)/$(docdir)"
 	$(INSTALL) -m 644 $(MANPAGES) "$(target)/$(mandir)/man1"
 
 #
@@ -288,14 +289,14 @@
 #
 
 INSTALLED_BINARIES := $(INSTALLABLES:%="$(target)/bin/%")
-INSTALLED_SHARED   := $(SHARED:%="$(target)/share/doc/reposurgeon/%")
+INSTALLED_SHARED   := $(SHARED:%="$(target)/$(docdir)/%")
 INSTALLED_MANPAGES := $(MANPAGES:%="$(target)/$(mandir)/man1/%")
 
 uninstall:
 	rm -f $(INSTALLED_BINARIES)
 	rm -f $(INSTALLED_MANPAGES)
 	rm -f $(INSTALLED_SHARED)
-	rmdir "$(target)/share/doc/reposurgeon"
+	rmdir "$(target)/$(docdir)"
 
 VERS=$(shell sh ./extractversion.sh <NEWS.adoc)