Pass MAKE value to configure for non-default name case

GNU make does not export it by default.

configure.ac

@@ -4079,7 +4079,7 @@ AC_CONFIG_FILES(Makefile:template/Makefile.in, [
 	echo 'ruby: $(PROGRAM);' >> $tmpmk
 	test "$tmpmk" = "$tmpgmk" || rm -f "$tmpgmk"
     ]) && mv -f $tmpmk Makefile],
-[EXEEXT='$EXEEXT' gnumake='$gnumake' GIT='$GIT'])
+[EXEEXT='$EXEEXT' MAKE='$MAKE' gnumake='$gnumake' GIT='$GIT'])
 
 AC_ARG_WITH([ruby-pc],
 	    AC_HELP_STRING([--with-ruby-pc=FILENAME], [pc file basename]),

defs/gmake.mk

@@ -1,5 +1,6 @@
 # -*- mode: makefile-gmake; indent-tabs-mode: t -*-
 
+reconfig config.status: export MAKE:=$(MAKE)
 override gnumake_recursive := $(if $(findstring n,$(firstword $(MFLAGS))),,+)
 override mflags := $(filter-out -j%,$(MFLAGS))
 MSPECOPT += $(if $(filter -j%,$(MFLAGS)),-j)