diff --git a/lang/dotnet/Makefile b/lang/dotnet/Makefile
--- a/lang/dotnet/Makefile
+++ b/lang/dotnet/Makefile
@@ -40,6 +40,9 @@
 
 DIST_SUBDIR=	dotnet
 
+SUB_FILES=	post-install-set-location
+PKGPOSTINSTALL=	${WRKDIR}/post-install-set-location
+
 BOOTSTRAP_DOTNETVERSION=			8.0
 BOOTSTRAP_SDKVERSION=				${BOOTSTRAP_DOTNETVERSION}.100
 BOOTSTRAP_SDKVERSIONSUFFIX=			-rtm.23551.1
diff --git a/lang/dotnet/files/post-install-set-location.in b/lang/dotnet/files/post-install-set-location.in
new file mode 100644
--- /dev/null
+++ b/lang/dotnet/files/post-install-set-location.in
@@ -0,0 +1,8 @@
+ETCFILE=/etc/dotnet/install_location
+if [ -f ${ETCFILE} ]; then
+	echo ${ETCFILE} exists, skipping.
+else
+	echo Writing dotnet location to ${ETCFILE}
+	mkdir -p $(dirname ${ETCFILE}) || exit 1;
+	echo "%%PREFIX%%/dotnet" >${ETCFILE}
+fi