Index: Makefile.in
==================================================================
--- Makefile.in
+++ Makefile.in
@@ -82,12 +82,12 @@
 	rm -f pkgIndex.tcl
 	rm -f config.log config.status
 	rm -f nano.tcl.h nano.tcl.h.new.1 nano.tcl.h.new.2
 
 mrproper: distclean
-	rm -f configure aclocal.m4 config.guess config.sub install-sh
-	rm -f nano.vers
-	rm -rf tweetnacl blake2b
-	$(MAKE) -C build/tweetnacl distclean
-	$(MAKE) -C build/blake2b distclean
+	rm -f @srcdir@/configure @srcdir@/aclocal.m4 @srcdir@/config.guess @srcdir@/config.sub @srcdir@/install-sh
+	rm -f @srcdir@/nano.vers
+	rm -rf @srcdir@/tweetnacl @srcdir@/blake2b
+	$(MAKE) -C @srcdir@/build/tweetnacl distclean
+	$(MAKE) -C @srcdir@/build/blake2b distclean
 
 .PHONY: all test clean distclean mrproper