Index: aclocal/shobj.m4
==================================================================
--- aclocal/shobj.m4
+++ aclocal/shobj.m4
@@ -162,17 +162,19 @@
 						;;
 				esac
 				;;
 			mingw32|mingw32msvc*)
 				SHOBJEXT="dll"
+				AREXT='lib'
 				CFLAGS="$CFLAGS -mms-bitfields"
 				CPPFLAGS="$CPPFLAGS -mms-bitfields"
 				SHOBJCPPFLAGS="-DPIC"
 				SHOBJLDFLAGS='-shared -Wl,--dll -Wl,--enable-auto-image-base -Wl,--output-def,$[@].def,--out-implib,$[@].a'
 				;;
 			msvc)
 				SHOBJEXT="dll"
+				AREXT='lib'
 				CFLAGS="$CFLAGS -nologo"
 				SHOBJCPPFLAGS='-DPIC'
 				SHOBJLDFLAGS='/LD /LINK /NODEFAULTLIB:MSVCRT'
 				;;
 			cygwin*)