Fix GNU make detection.

(The test 'make --version' with FreeBSD make (and potentially others)
would just reinvoke make on the same Makefile, resulting in an infinite
loop.)

Makefile

@@ -13,14 +13,14 @@
 
 all check install installdirs installcheck uninstall dep depend clean distclean maintainer-clean:
 	@if ! [ -f GNUmakefile ] ; then \
-	   echo "You need to run the \`configure' program first. See the file"; \
-	   echo "\`INSTALL' for installation instructions." ; \
+	   echo "You need to run the 'configure' program first. See the file"; \
+	   echo "'INSTALL' for installation instructions." ; \
 	   false ; \
 	 fi
 	@IFS=':' ; \
 	 for dir in $$PATH; do \
 	   for prog in gmake gnumake make; do \
-	     if [ -f $$dir/$$prog ] && ( $$dir/$$prog --version 2>/dev/null | grep GNU >/dev/null 2>&1 ) ; then \
+	     if [ -f $$dir/$$prog ] && ( $$dir/$$prog -f /dev/null --version 2>/dev/null | grep GNU >/dev/null 2>&1 ) ; then \
 	       GMAKE=$$dir/$$prog; \
 	       break 2; \
 	     fi; \

src/Makefile

@@ -11,16 +11,16 @@
 # GNUmakefile won't exist yet, so we catch that case as well.
 
 
-all install clean dep depend distclean maintainer-clean:
+all check install installdirs installcheck uninstall dep depend clean distclean maintainer-clean:
 	@if ! [ -f GNUmakefile ] ; then \
-	   echo "You need to run the \`configure' program first. See the file"; \
-	   echo "\`INSTALL' for installation instructions." ; \
+	   echo "You need to run the 'configure' program first. See the file"; \
+	   echo "'INSTALL' for installation instructions." ; \
 	   false ; \
 	 fi
 	@IFS=':' ; \
 	 for dir in $$PATH; do \
 	   for prog in gmake gnumake make; do \
-	     if [ -f $$dir/$$prog ] && ( $$dir/$$prog --version | grep GNU >/dev/null 2>&1 ) ; then \
+	     if [ -f $$dir/$$prog ] && ( $$dir/$$prog -f /dev/null --version 2>/dev/null | grep GNU >/dev/null 2>&1 ) ; then \
 	       GMAKE=$$dir/$$prog; \
 	       break 2; \
 	     fi; \