Index: build-aux/m4/buildsys.m4
==================================================================
--- build-aux/m4/buildsys.m4
+++ build-aux/m4/buildsys.m4
@@ -1,7 +1,7 @@
 dnl
-dnl Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2016
+dnl Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2016, 2017
 dnl Jonathan Schleifer <js@heap.zone>
 dnl
 dnl https://heap.zone/git/?p=buildsys.git
 dnl
 dnl Permission to use, copy, modify, and/or distribute this software for any
@@ -98,11 +98,11 @@
 	AC_MSG_CHECKING(whether we need an implib)
 	case "$host_os" in
 		cygwin* | mingw*)
 			AC_MSG_RESULT(yes)
 			PROG_IMPLIB_NEEDED='yes'
-			PROG_IMPLIB_LDFLAGS='-Wl,-export-all-symbols,--out-implib,lib${PROG}.a'
+			PROG_IMPLIB_LDFLAGS='-Wl,--export-all-symbols,--out-implib,lib${PROG}.a'
 			;;
 		*)
 			AC_MSG_RESULT(no)
 			PROG_IMPLIB_NEEDED='no'
 			PROG_IMPLIB_LDFLAGS=''
@@ -133,11 +133,11 @@
 			CLEAN_LIB=''
 			;;
 		mingw* | cygwin*)
 			AC_MSG_RESULT(MinGW / Cygwin)
 			LIB_CFLAGS=''
-			LIB_LDFLAGS='-shared -Wl,--out-implib,${SHARED_LIB}.a'
+			LIB_LDFLAGS='-shared -Wl,--export-all-symbols,--out-implib,${SHARED_LIB}.a'
 			LIB_PREFIX='lib'
 			LIB_SUFFIX='.dll'
 			LDFLAGS_RPATH='-Wl,-rpath,${libdir}'
 			PLUGIN_CFLAGS=''
 			PLUGIN_LDFLAGS='-shared'