lmms: use qt5 on newer macos

Fixes: https://trac.macports.org/ticket/69923

multimedia/lmms/Portfile

@@ -4,13 +4,12 @@ PortSystem          1.0
 PortGroup           cmake 1.1
 PortGroup           github 1.0
 PortGroup           legacysupport 1.1
-PortGroup           qt4 1.0
 
 # MAP_ANONYMOUS
 legacysupport.newest_darwin_requires_legacy 14
 
 github.setup        LMMS lmms 1.2.2 v
-revision            0
+revision            1
 categories          multimedia audio
 maintainers         {@barracuda156 gmail.com:vital.had} openmaintainer
 license             GPL-2+
@@ -82,11 +81,22 @@ configure.args-append   -DFLTK_FLUID_EXECUTABLE=${prefix}/bin/fluid \
                         -DWANT_STK=ON \
                         -DWANT_VST=OFF
 
+if {${os.platform} ne "darwin" || ${os.major} >= 18} {
+    PortGroup       qt5 1.0
+
+    qt5.depends_build_component qttools
+
+    configure.args-append   -DWANT_QT5=ON
+} else {
+    PortGroup       qt4 1.0
+
+}
+
 # See: https://github.com/jackaudio/jack2/issues/950
 if {${os.platform} ne "darwin" || ${configure.build_arch} ni [list ppc ppc64]} {
-	configure.args-replace \
-	                    -DWANT_JACK=OFF -DWANT_JACK=ON
-	depends_lib-append  port:jack
+    configure.args-replace \
+                        -DWANT_JACK=OFF -DWANT_JACK=ON
+    depends_lib-append  port:jack
 }
 
 configure.args-replace  -DCMAKE_INSTALL_NAME_DIR=${prefix}/lib -DCMAKE_INSTALL_NAME_DIR=${applications_dir}/LMMS.app/Contents/Frameworks