The oldest llvm linked to the build is 21. I think this check can go.

Index: clang.port.mk
===================================================================
RCS file: /cvs/ports/lang/clang/clang.port.mk,v
diff -u -p -r1.46 clang.port.mk
--- clang.port.mk	2 Jun 2026 12:43:25 -0000	1.46
+++ clang.port.mk	23 Jun 2026 15:22:10 -0000
@@ -11,10 +11,6 @@ MODCLANG_BUILDDEP ?= Yes
 MODCLANG_RUNDEP ?= No
 MODCLANG_CPPLIB ?= No
 
-.if ${MODCLANG_CPPLIB:L} == "yes" && ${MODCLANG_VERSION} < 19
-ERRORS += "Fatal: ${MODCLANG_LIB_DEPENDS} does not support ports libc++"
-.endif
-
 .if ${MODCLANG_RUNDEP:L} == "yes"
 RUN_DEPENDS+=           ${MODCLANG_RUN_DEPENDS}
 .endif