diff -ur ircii-20151120/Makefile.in ircii-20151120.new/Makefile.in
--- ircii-20151120/Makefile.in	2015-11-11 17:01:46.000000000 -0600
+++ ircii-20151120.new/Makefile.in	2016-04-12 13:11:58.553493486 -0500
@@ -64,7 +64,7 @@
 libdir = $(DESTDIR)@libdir@
 libexecdir = $(DESTDIR)@libexecdir@
 # @mandir@ tends to be $datarootdir which already has $DESTDIR.
-mandir = @mandir@/man1
+mandir = $(DESTDIR)@mandir@/man1
 
 # Where the ircII binary will be installed.
 # 'make install' will compile and install the program