diff --git a/Makefile b/Makefile
index 3ccb14e..69f80ee 100644
--- a/Makefile
+++ b/Makefile
@@ -17,16 +17,22 @@ packages: packages-rpm
 #
 # MacPorts builds
 #
+# To test:
+# rm -rf /tmp/foo ; mkdir -p /tmp/foo;make packages-macports DESTDIR=/tmp/foo;find /tmp/foo -ls
 
 # Make mk_macports.vcs_blackbox.txt from mk_rpm_fpmdir.stack_blackbox.txt:
 tools/mk_macports.vcs_blackbox.txt: tools/mk_rpm_fpmdir.stack_blackbox.txt
-	sed -e 's@/usr/blackbox/bin/@bin/@g' -e 's@/etc/profile.d@etc/profile.d@g' <tools/mk_rpm_fpmdir.stack_blackbox.txt >$@
+	sed -e 's@/usr/blackbox/bin/@bin/@g' -e '/profile.d-usrblackbox.sh/d' <tools/mk_rpm_fpmdir.stack_blackbox.txt >$@
+
+check-destdir:
+ifndef DESTDIR
+  $(error DESTDIR is undefined)
+endif
 
 # MacPorts expects to run: make packages-macports DESTDIR=${destroot}
-packages-macports: tools/mk_macports.vcs_blackbox.txt
-	mkdir -p $(DESTDIR)/etc/profile.d
+packages-macports: tools/mk_macports.vcs_blackbox.txt check-destdir
 	mkdir -p $(DESTDIR)/bin
-	cd tools && ./mk_macports vcs_blackbox mk_macports.vcs_blackbox.txt
+	cd tools && ./mk_macports mk_macports.vcs_blackbox.txt
 
 #
 # RPM builds
diff --git a/tools/mk_macports b/tools/mk_macports
index 3849fc6..57fc8b4 100755
--- a/tools/mk_macports
+++ b/tools/mk_macports
@@ -1,4 +1,4 @@
-#! /usr/bin/env bash
+#!/usr/bin/env bash
 
 # Install files into MacPorts DESTDIR
 
@@ -14,11 +14,9 @@
 
 set -e
 
-# Parameters for this RPM:
+# Fail if DESTDIR is not set.
 DESTDIR="${DESTDIR?"Envvar DESTDIR must be set to destination dir."}"
 
-# -- Now the real work can be done.
-
 # Copy the files into place:
 cat """$@""" | while read -a arr ; do
   PERM="${arr[0]}"
@@ -30,9 +28,5 @@ cat """$@""" | while read -a arr ; do
   esac
   DST="$DESTDIR/${arr[1]}"
   SRC="${arr[2]}"
-  if [[ $SRC == "cmd/"* || $SRC == *"/cmd/"* ]]; then
-    ( cd $(dirname "$SRC" ) && go build -a -v ) 
-  fi
-  echo install -m "$PERM" "$SRC" "$DST"
   install -m "$PERM" "$SRC" "$DST"
 done
diff --git a/tools/mk_macports.vcs_blackbox.txt b/tools/mk_macports.vcs_blackbox.txt
index e84f4bd..4948454 100644
--- a/tools/mk_macports.vcs_blackbox.txt
+++ b/tools/mk_macports.vcs_blackbox.txt
@@ -1,4 +1,3 @@
-read etc/profile.d/usrblackbox.sh               profile.d-usrblackbox.sh
 exec bin/_blackbox_common.sh       ../bin/_blackbox_common.sh
 exec bin/_stack_lib.sh             ../bin/_stack_lib.sh
 exec bin/blackbox_addadmin         ../bin/blackbox_addadmin