Fixups for ancient versions of mingw

Tested with mingw32-4.8.2 and make 3.79.1 running on Windows XP

config.mingw.mk

@@ -1,5 +1,5 @@
 #******************************************************************************
-# config.mingw.mk                                             Recorder project 
+# config.mingw.mk                                             Recorder project
 #******************************************************************************
 #
 #  File Description:
@@ -31,10 +31,9 @@ include $(BUILD)config.gnu.mk
 # MinGW does not have --line-buffered for colorized builds
 LINE_BUFFERED=
 
-
 # Windows overrides for extensions
 EXE_EXT=        .exe
-LIB_EXT=        .lib
+LIB_EXT=        .a
 DLL_EXT=        .dll
 
 # MinGW has no 'install' program

config.mk

@@ -63,8 +63,8 @@ PREFIX_DLL?=$(PREFIX_LIB)
 # to the relevant GNU option names as follows:
 #   CCFLAGS_STD=$(CC_FLAGS_STD_$(CC_STD))
 #   CCFLAGS_STD_gnu11=[whatever option is needed here]
-CC_STD=gnu11
-CXX_STD=gnu++14
+CC_STD	?=gnu11
+CXX_STD	?=gnu++11
 
 # Compilation flags
 DEFINES_debug=      DEBUG

rules.mk

@@ -332,7 +332,11 @@ ifdef TARGET
 DEPENDENCIES=$(SOURCES:%=$(OBJDIR)/%$(OBJ_EXT).d)
 OBJDIR_DEPS=$(OBJDIR)/%.deps/.mkdir
 
+ifeq (3.80,$(firstword $(sort $(MAKE_VERSION) 3.80)))
 OBJ_DEPS=$(OBJDIR_DEPS) $(MAKEFILE_DEPS) | hello prebuild
+else
+OBJ_DEPS=$(OBJDIR_DEPS) $(MAKEFILE_DEPS)  hello prebuild
+endif
 
 ifndef DEPFLAGS
 $(OBJDIR)/%.c$(OBJ_EXT).d:		%.c		$(OBJ_DEPS)