Index: make-4.2.1/Makefile.am
===================================================================
--- make-4.2.1.orig/Makefile.am
+++ make-4.2.1/Makefile.am
@@ -188,8 +188,8 @@ check-regression: tests/config-flags.pm
 		     rm -f tests/$$f; ln -s ../srctests/$$f tests; \
 		   done; fi ;; \
 	    esac; \
-	    echo "cd tests && $(PERL) ./run_make_tests.pl -srcdir $(abs_srcdir) -make ../make$(EXEEXT) $(MAKETESTFLAGS)"; \
-	    cd tests && $(PERL) ./run_make_tests.pl -srcdir '$(abs_srcdir)' -make '../make$(EXEEXT)' $(MAKETESTFLAGS); \
+	    echo "cd tests && $(PERL) -I. ./run_make_tests.pl -srcdir $(abs_srcdir) -make ../make$(EXEEXT) $(MAKETESTFLAGS)"; \
+	    cd tests && $(PERL) -I. ./run_make_tests.pl -srcdir '$(abs_srcdir)' -make '../make$(EXEEXT)' $(MAKETESTFLAGS); \
 	  else \
 	    echo "Can't find a working Perl ($(PERL)); the test suite requires Perl."; \
 	  fi; \
Index: make-4.2.1/tests/run_make_tests
===================================================================
--- make-4.2.1.orig/tests/run_make_tests
+++ make-4.2.1/tests/run_make_tests
@@ -1,2 +1,2 @@
 #!/bin/sh
-exec perl $0.pl ${1+"$@"}
+exec perl -I ${0%/*} $0.pl ${1+"$@"}