dvdrw-tools: fix build

sysutils/dvdrw-tools/Portfile

@@ -14,8 +14,6 @@ maintainers         nomaintainer
 description         Tool for mastering DVD media, including +R/RW and -R/RW
 long_description    ${description}
 
-platforms           darwin
-
 homepage            http://fy.chalmers.se/~appro/linux/DVD+RW/
 master_sites        ${homepage}tools/
 distname            dvd+rw-tools-${version}
@@ -28,6 +26,8 @@ post-patch {
    reinplace "s|@@PREFIX@@|${prefix}|g" ${worksrcpath}/Makefile.m4
 }
 
+configure.cxxflags-append	-std=c++98
+
 post-destroot {
     xinstall -m 0755 -d ${destroot}${prefix}/share/doc/${name}
     xinstall -m 0644 -W ${worksrcpath} index.html \