science/openbabel: Take maintainership; Add the GUI option using wxWidgets-3.0

GUI is "on" by default because that's what CMakeLists.txt suggests as default.
Also improve helpers use.

science/openbabel/Makefile

@@ -3,11 +3,12 @@
 
 PORTNAME=	openbabel
 PORTVERSION=	2.4.1
+PORTREVISION=	1
 CATEGORIES=	science
 MASTER_SITES=	SF
 
-MAINTAINER=	ports@FreeBSD.org
-COMMENT=	Chemistry file translation program
+MAINTAINER=	yuri@FreeBSD.org
+COMMENT=	Chemical toolbox designed to speak the many languages of chemical data
 
 LICENSE=	GPLv2+
 LICENSE_FILE=	${WRKSRC}/COPYING
@@ -16,24 +17,27 @@ BROKEN_powerpc64=	Does not build: relocation truncated to fit: R_PPC64_TOC16_DS
 
 CONFLICTS_INSTALL=	babel-*
 
+USES=		cmake:outsource eigen:3
 USE_CXXSTD=	gnu++98
 USE_GNOME=	libxml2
-USES=		cmake:outsource eigen:3
-CMAKE_ARGS=	-DBUILD_GUI=off
 USE_LDCONFIG=	yes
 
 PLIST_SUB=	VERSION="${PORTVERSION}"
 
-OPTIONS_DEFINE=	CAIRO PYTHON
-OPTIONS_DEFAULT=	PYTHON
+OPTIONS_DEFINE=	CAIRO PYTHON GUI
+OPTIONS_DEFAULT=	PYTHON GUI
 OPTIONS_SUB=	yes
 
 CAIRO_DESC=	PNG support via cairo library
-CAIRO_LIB_DEPENDS=	libcairo.so:graphics/cairo
 CAIRO_USES=	pkgconfig
+CAIRO_USE=	GNOME=cairo
 
 PYTHON_USES=	python
-PYTHON_CMAKE_ON=	-DPYTHON_BINDINGS=on
+PYTHON_CMAKE_BOOL=	PYTHON_BINDINGS
+
+GUI_CMAKE_BOOL=	BUILD_GUI
+GUI_CMAKE_ON=	-DwxWidgets_CONFIG_EXECUTABLE:STRING=${WX_CONFIG}
+GUI_USE=	WX=3.0
 
 post-patch:
 	${REINPLACE_CMD} -e '/pkgconfig/s,$${LIB_INSTALL_DIR},libdata,' \

science/openbabel/pkg-descr

@@ -16,4 +16,4 @@ Features currently include:
    * Open-source/Free Software under the GNU General Public License
    * Cross platform (Windows, Linux, Mac OS X, SGI, Solaris, Dreamcast...)
 
-WWW: http://openbabel.sourceforge.net/
+WWW: https://openbabel.org/wiki/Main_Page

science/openbabel/pkg-plist

@@ -7,6 +7,7 @@ bin/obenergy
 bin/obfit
 bin/obgen
 bin/obgrep
+%%GUI%%bin/obgui
 bin/obminimize
 bin/obprobe
 bin/obprop