Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -18,10 +18,15 @@
 	*-msdosdjgpp*)
 		enable_shared="no"
 		enable_threads="no"
 		enable_sockets="no"
 		;;
+	*-*-mingw*)
+		LDFLAGS="$LDFLAGS -Wl,--allow-multiple-definition"
+		AC_SUBST(ALLOW_MULTIPLE_DEFINITION,
+			[--Wl,--allow-multiple-definition])
+		;;
 	*-psp-*)
 		AS_IF([test x"$DEVKITPSP" = x""], [
 			AC_MSG_ERROR(
 				[DEVKITPSP is not set! Please set DEVKITPSP.])
 		])

Index: utils/objfw-config.in
==================================================================
--- utils/objfw-config.in
+++ utils/objfw-config.in
@@ -27,11 +27,11 @@
 OBJCFLAGS="$OBJCFLAGS @NO_CONST_CFSTRINGS@ @BLOCKS_FLAGS@"
 LIB_CFLAGS="@LIB_CFLAGS@"
 LIB_LDFLAGS="@LIB_LDFLAGS@"
 LIB_PREFIX="@LIB_PREFIX@"
 LIB_SUFFIX="@LIB_SUFFIX@"
-LDFLAGS=""
+LDFLAGS="@ALLOW_MULTIPLE_DEFINITION@"
 LDFLAGS_REEXPORT="@LDFLAGS_REEXPORT@"
 LDFLAGS_RPATH="@LDFLAGS_RPATH@"
 LIBS="-L${libdir} -lobjfw @LIBS@"
 PLUGIN_CFLAGS="@PLUGIN_CFLAGS@"
 PLUGIN_LDFLAGS="@PLUGIN_LDFLAGS@"