devel/libexplain: Fix build on 14

- Refactor USES=localbase
- Pet portclippy

Approved by:	portmgr (blanket)

devel/libexplain/Makefile

@@ -12,20 +12,31 @@ WWW=		http://libexplain.sourceforge.net/
 LICENSE=	LGPL3+
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
+DEPRECATED=	Upstream last release was in 2014
+#BROKEN_FreeBSD_14=	Build fails with lots of error on llvm15
+
 BUILD_DEPENDS=	gsed:textproc/gsed
 RUN_DEPENDS=	lsof:sysutils/lsof
 
-USES=		bison gettext ghostscript:build gmake groff iconv libtool:build
+USES=		bison gettext ghostscript:build gmake groff iconv libtool:build localbase
+USE_LDCONFIG=	yes
+
 GNU_CONFIGURE=	yes
 CONFIGURE_ENV=	ac_cv_header_linux_kd_h=no
-USE_LDCONFIG=	yes
 
-CPPFLAGS+=	-I${LOCALBASE}/include
-LIBS+=		-L${LOCALBASE}/lib
+OPTIONS_DEFINE=	DOCS
 
 PATCHLEVEL=	D012
 
-OPTIONS_DEFINE=	DOCS
+.include <bsd.port.options.mk>
+
+.if ${OPSYS} == FreeBSD && ( ${OSVERSION} >= 1400079 || ( ${OSVERSION} >= 1302505 && ${OSVERSION} < 1400000 ))
+USES+=		llvm:max=14
+CPP=            clang-cpp${LLVM_VERSION}
+CC=             clang${LLVM_VERSION}
+CXX=            clang++${LLVM_VERSION}
+MAKE_JOBS_UNSAFE=	yes
+.endif
 
 .include <bsd.port.pre.mk>