After the update to portmidi-2.0.4, audio/mscore is now picking it up.
Below are two versions of the same diff.

Ok for one of them?



Index: Makefile
===================================================================
RCS file: /cvs/ports/audio/mscore/Makefile,v
retrieving revision 1.65
diff -u -p -u -p -r1.65 Makefile
--- Makefile	30 Jan 2025 06:29:01 -0000	1.65
+++ Makefile	14 May 2025 05:21:51 -0000
@@ -20,6 +20,7 @@ WANTLIB += Qt5Network Qt5OpenGL Qt5Print
 WANTLIB += Qt5QuickControls2 Qt5QuickWidgets Qt5Sql Qt5Svg Qt5Test
 WANTLIB += Qt5Widgets Qt5Xml Qt5XmlPatterns c freetype m ogg portaudio
 WANTLIB += sndfile vorbis vorbisfile z Qt5QmlModels Qt5QuickTemplates2
+WANTLIB += portmidi
 
 MODULES =	devel/cmake \
 		x11/qt5






Index: Makefile
===================================================================
RCS file: /cvs/ports/audio/mscore/Makefile,v
retrieving revision 1.65
diff -u -p -u -p -r1.65 Makefile
--- Makefile	30 Jan 2025 06:29:01 -0000	1.65
+++ Makefile	14 May 2025 05:18:23 -0000
@@ -16,10 +16,11 @@ MAINTAINER =	Brian Callahan <bcallah@ope
 PERMIT_PACKAGE =	Yes
 
 WANTLIB += ${COMPILER_LIBCXX} Qt5Concurrent Qt5Core Qt5Gui Qt5Help
-WANTLIB += Qt5Network Qt5OpenGL Qt5PrintSupport Qt5Qml Qt5Quick
-WANTLIB += Qt5QuickControls2 Qt5QuickWidgets Qt5Sql Qt5Svg Qt5Test
-WANTLIB += Qt5Widgets Qt5Xml Qt5XmlPatterns c freetype m ogg portaudio
-WANTLIB += sndfile vorbis vorbisfile z Qt5QmlModels Qt5QuickTemplates2
+WANTLIB += Qt5Network Qt5OpenGL Qt5PrintSupport Qt5Qml Qt5QmlModels
+WANTLIB += Qt5Quick Qt5QuickControls2 Qt5QuickTemplates2 Qt5QuickWidgets
+WANTLIB += Qt5Sql Qt5Svg Qt5Test Qt5Widgets Qt5Xml Qt5XmlPatterns
+WANTLIB += c freetype m ogg portaudio portmidi sndfile vorbis
+WANTLIB += vorbisfile z
 
 MODULES =	devel/cmake \
 		x11/qt5