diff --git a/QUICKSTART b/QUICKSTART
index db64a2ec..3916a34f 100644
--- a/QUICKSTART
+++ b/QUICKSTART
@@ -5,7 +5,7 @@ http://en.altlinux.org/Hasher; large tmpfs helps a lot).
 ~~~~~~~~~
 - ALT Linux 7.0 или выше (возможна адаптация "вниз")
 - установленный mkimage (свежий, как и hasher)
-- пользователь с правом запуска hasher
+- пользователь с правом запуска hasher и подключения /proc к нему
 
 полезно
 ~~~~~~~
diff --git a/bin/mktmpdir b/bin/mktmpdir
index 329a19cf..b96dffa6 100755
--- a/bin/mktmpdir
+++ b/bin/mktmpdir
@@ -6,6 +6,14 @@
 DIRS="$TMP $TMPDIR $HOME/hasher /tmp /var/tmp .."
 MINSIZE=262144		# face control criterion
 
+# mkimage needs /proc among those, be clear about that
+check_allowed_mountpoints()
+{
+	grep -wqs "^allowed_mountpoints=[^#]*/proc" \
+		/etc/hasher-priv/system \
+		`/usr/libexec/hasher-priv/getconf.sh`
+}
+
 # poor man's SourceIfExists()
 try_source() { [ -f "$1" ] && . "$1"; }
 
@@ -59,6 +67,12 @@ choose_tmpdir() {
 }
 
 # bringing it all together
+if ! check_allowed_mountpoints; then
+	echo "error: hasher's allowed_mountpoints do not include /proc;"
+	echo "please check hasher docs and /etc/hasher-priv/system"
+	exit 1
+fi >&2
+
 TMPDIRS="`contemplate_dirs $DIRS`"
 if [ -z "$TMPDIRS" ]; then
 	echo "error: no suitable directories found;"
diff --git a/lib/build.mk b/lib/build.mk
index 5d48276b..97ebb65c 100644
--- a/lib/build.mk
+++ b/lib/build.mk
@@ -4,7 +4,7 @@ ANSI_FAIL ?= 1;31
 
 MAX_LINES = 200
 MAX_ERRORS = 5
-GOTCHA := ^(((\*\* )?(E:|[Ee]rror|[Ww]arning).*)|(.* (FAILURE|FATAL|ERROR|conflicts|Depends:) .*)|(.* (Stop|failed|not found)\.))$$
+GOTCHA := ^(((\*\* )?(E:|[Ee]rror|[Ww]arning).*)|(.* (FAILURE|FATAL|ERROR|conflicts|Depends:) .*)|(.* (Stop|failed|not found)\.)|(not allowed))$$
 
 ifndef MKIMAGE_PROFILES
 $(error this makefile is designed to be included in toplevel one)