erlang: turn x11 option into erlang-wx subpackage.

Cross-compiling with wx is not supported.

Closes #15918.

srcpkgs/erlang-wx

@@ -0,0 +1 @@
+erlang

srcpkgs/erlang/template

@@ -1,23 +1,26 @@
 # Template file for 'erlang'
 pkgname=erlang
 version=22.1.7
-revision=1
+revision=2
 create_wrksrc=yes
 build_wrksrc="otp-OTP-${version}"
 build_style=gnu-configure
-configure_args="$(vopt_if x11 --with-wx-config=wx-config-3.0)"
 make_install_target="install install-docs"
-hostmakedepends="perl libxslt autoconf"
-makedepends="ncurses-devel unixodbc-devel libressl-devel zlib-devel
- $(vopt_if x11 'wxWidgets-devel glu-devel')"
+hostmakedepends="autoconf libxslt perl"
+makedepends="libressl-devel ncurses-devel unixodbc-devel zlib-devel"
 short_desc="Concurrent functional programming language developed by Ericsson"
 maintainer="Leah Neukirchen <leah@vuxu.org>"
 license="Apache-2.0"
 homepage="http://www.erlang.org/"
 distfiles="https://github.com/erlang/otp/archive/OTP-${version}.tar.gz"
 checksum=f0f8ad265121e4170598d0339ebba4e77f04d31db894d5e70c5a953544f62a47
+subpackages="erlang-doc"
 
-build_options="x11"
+if [ -z "$CROSS_BUILD" ]; then
+	configure_args+=" --with-wx-config=wx-config-3.0"
+	makedepends+=" wxWidgets-devel glu-devel"
+	subpackages+=" erlang-wx"
+fi
 
 case "$XBPS_TARGET_MACHINE" in
 	*-musl) configure_args+=" --disable-hipe" ;;
@@ -64,3 +67,11 @@ erlang-doc_package() {
 		done
 	}
 }
+
+erlang-wx_package() {
+	short_desc+=" - wxWidgets binding"
+	depends="${sourcepkg}>=${version}_${revision}"
+	pkg_install() {
+		vmove usr/lib/erlang/lib/wx*
+	}
+}