diff --git a/npa/Makefile.am b/npa/Makefile.am
index efbde96..0047f22 100644
--- a/npa/Makefile.am
+++ b/npa/Makefile.am
@@ -15,13 +15,19 @@ do_subst = sed \
 	   -e 's,[@]OPENSC_LIBS[@],$(OPENSC_LIBS),g' \
 	   -e 's,[@]top_srcdir[@],$(top_srcdir),g'
 
-win:
+win-opensc:
 	cd $(top_srcdir)/src/opensc && \
 		./bootstrap && \
 		./configure --disable-doc && \
 		env OPENSSL_VERSION="1.0.0e" OPENSSL_URL="https://www2.informatik.hu-berlin.de/~morgner/files/openssl-1.0.0e.tar.gz" EXTRA_OPENSSL_CONFIG="experimental-pace" win32/installer_from_build.sh
-	env CHOST=i586-mingw32msvc CBUILD=i686-pc-linux-gnu \
-		./configure --sbindir=/bin \
+
+win:
+	./configure \
+		--sbindir=/bin \
+		--prefix=/ \
+		--host=i586-mingw32msvc \
+		--build=i686-pc-linux-gnu \
+		--program-prefix='' \
 		OPENSSL_CFLAGS="-I`pwd`/src/opensc/win32/build/image/opensc/include" \
 		OPENSSL_LIBS="-L`pwd`/src/opensc/win32/build/image/opensc/lib -lcrypto" \
 		OPENSC_LIBS="-L`pwd`/src/opensc/win32/build/image/opensc/lib -lopensc"