--- src/VBox/Runtime/Makefile.kmk.orig	2025-08-28 22:09:24 UTC
+++ src/VBox/Runtime/Makefile.kmk
@@ -233,6 +233,9 @@ $(IPRT_OUT_DIR)/oiddb.h.ts +| $(IPRT_OUT_DIR)/oiddb.h:
 	$(QUIET)$(oiddb2c_1_TARGET) "$@" $(filter %.cfg,$^)
 	$(QUIET)$(CP) --changed -fv "$@" "$(IPRT_OUT_DIR)/oiddb.h"
 
+# Set the defines that utf8-posix.cpp needs. It's used by several targets.
+#
+r3/posix/utf8-posix.cpp_DEFS.freebsd = $(VBOX_ICONV_DEFS)
 
 #
 # Unicode Specification reader used to regenerate unidata-*.cpp.
@@ -1516,6 +1519,7 @@ RuntimeBaseR3_SOURCES.freebsd = \
 	generic/RTProcDaemonize-generic.cpp \
 	generic/RTProcIsRunningByName-generic.cpp \
 	generic/RTThreadGetNativeState-generic.cpp \
+	generic/system-page-size-generic.cpp \
 	r3/freebsd/fileaio-freebsd.cpp \
 	r3/freebsd/RTFileQuerySectorSize-freebsd.cpp \
 	r3/freebsd/mp-freebsd.cpp \
@@ -3072,6 +3076,8 @@ VBoxRT_LDFLAGS.win             = /MANIFEST \
 	/delayload:ole32.dll \
 	/delayload:oleaut32.dll \
 	/delayload:advapi32.dll
+VBoxRT_LDFLAGS.freebsd          = \
+	-Wl,--allow-multiple-definition
 
 if1of (VBoxRT, $(DLLS))
  $(call VBOX_SET_VER_INFO_DLL,VBoxRT,VirtualBox Runtime)