diff --git a/cabal-tweak-dep-ver b/cabal-tweak-dep-ver
index 525b786..9b15068 100755
--- a/cabal-tweak-dep-ver
+++ b/cabal-tweak-dep-ver
@@ -2,11 +2,15 @@
 
 set -e +x
 
+function fail {
+    echo "$0: $1" >&2
+    exit 1
+}
+
 USAGE="Usage: $0 dep old new"
 
 if [ $# -ne 3 ]; then
-    echo "$USAGE"
-    exit 1
+    fail "$USAGE"
 fi
 
 DEP=$1
@@ -16,15 +20,13 @@ NEW=$3
 CABALFILE=$(ls *.cabal)
 
 if [ $(echo $CABALFILE | wc -w) -ne 1 ]; then
-   echo "There needs to be one .cabal file in the current dir!"
-   exit 1
+   fail "There needs to be one .cabal file in the current dir!"
 fi
 
 BREAK=[^[:alnum:]-]
 
 if ! grep -q "$BREAK$DEP$BREAK[^,]*$OLD" $CABALFILE; then
-   echo "$CABALFILE does not match: $DEP $OLD"
-   exit 1
+   fail "$CABALFILE does not match: $DEP $OLD"
 fi
 
 if [ ! -f $CABALFILE.orig ]; then
diff --git a/cabal-tweak-drop-dep b/cabal-tweak-drop-dep
index 04d95bc..4a12bfb 100755
--- a/cabal-tweak-drop-dep
+++ b/cabal-tweak-drop-dep
@@ -2,11 +2,15 @@
 
 set -e +x
 
+function fail {
+    echo "$0: $1" >&2
+    exit 1
+}
+
 USAGE="Usage: $0 dep"
 
 if [ $# -ne 1 ]; then
-    echo "$USAGE"
-    exit 1
+    fail "$USAGE"
 fi
 
 DEP=$1
@@ -14,8 +18,7 @@ DEP=$1
 CABALFILE=$(ls *.cabal)
 
 if [ $(echo $CABALFILE | wc -w) -ne 1 ]; then
-   echo "There needs to be one .cabal file in the current dir!"
-   exit 1
+   fail "There needs to be one .cabal file in the current dir!"
 fi
 
 if [ ! -f $CABALFILE.orig ]; then
@@ -23,8 +26,7 @@ if [ ! -f $CABALFILE.orig ]; then
 fi
 
 if grep "$DEP" $CABALFILE | sed -e "s/$DEP//" | grep -q -e "[A-Za-z]"; then
-    echo "$0: deleting whole $DEP lines not safe - try more precise pattern"
-    exit 1
+    fail "$0: deleting whole $DEP lines not safe - try more precise pattern"
 fi
 
 sed -i$BACKUP -e "/$DEP/d" $CABALFILE
diff --git a/cabal-tweak-flag b/cabal-tweak-flag
index 2bf3a42..d1b566b 100755
--- a/cabal-tweak-flag
+++ b/cabal-tweak-flag
@@ -5,11 +5,15 @@
 
 set -e +x
 
+function fail {
+    echo "$0: $1" >&2
+    exit 1
+}
+
 USAGE="Usage: $0 FLAG [True|False]"
 
 if [ $# -ne 2 ]; then
-    echo "$USAGE"
-    exit 1
+    fail "$USAGE"
 fi
 
 FLAG=$1
@@ -24,23 +28,19 @@ esac
 CABALFILE=$(ls *.cabal)
 
 if [ $(echo $CABALFILE | wc -w) -ne 1 ]; then
-   echo "There needs to be one .cabal file in the current dir!"
-   exit 1
+   fail "There needs to be one .cabal file in the current dir!"
 fi
 
 if ! grep -q -i "^flag *$FLAG" $CABALFILE; then
-   echo "$CABALFILE does not have flag $FLAG"
-   exit 1
+   fail "$CABALFILE does not have flag $FLAG"
 fi
 
 if ! grep -A3 -i "^flag *$FLAG" $CABALFILE | grep -q -i "default:"; then
-   echo "$CABALFILE: $FLAG flag might not have a default"
-   exit 1
+   fail "$CABALFILE: $FLAG flag might not have a default"
 fi
 
 if ! grep -A3 -i "^flag *$FLAG" $CABALFILE | grep -q -i "default: *$OLD"; then
-   echo "$CABALFILE: $FLAG flag already defaults to $NEW"
-   exit 1
+   fail "$CABALFILE: $FLAG flag already defaults to $NEW"
 fi
 
 if [ ! -f $CABALFILE.orig ]; then
diff --git a/cabal-tweak-remove-upperbound b/cabal-tweak-remove-upperbound
index abce557..1b5fc56 100755
--- a/cabal-tweak-remove-upperbound
+++ b/cabal-tweak-remove-upperbound
@@ -2,26 +2,28 @@
 
 set -e +x
 
+function fail {
+    echo "$0: $1" >&2
+    exit 1
+}
+
 USAGE="Usage: $0 dep"
 
 if [ $# -ne 1 ]; then
-    echo "$USAGE"
-    exit 1
+    fail "$USAGE"
 fi
 
 DEP=$1
 CABALFILE=$(ls *.cabal)
 
 if [ $(echo $CABALFILE | wc -w) -ne 1 ]; then
-   echo "There needs to be one .cabal file in the current dir!"
-   exit 1
+   fail "There needs to be one .cabal file in the current dir!"
 fi
 
 BREAK=[^[:alnum:]-]
 
 if ! grep -q "$BREAK$DEP$BREAK[^,]*" $CABALFILE; then
-   echo "$CABALFILE does not match: $DEP"
-   exit 1
+   fail "$CABALFILE does not match: $DEP"
 fi
 
 if [ ! -f $CABALFILE.orig ]; then
diff --git a/ghc-rpm-macros.spec b/ghc-rpm-macros.spec
index 8c6b59b..4be8031 100644
--- a/ghc-rpm-macros.spec
+++ b/ghc-rpm-macros.spec
@@ -10,7 +10,7 @@
 #%%global without_hscolour 1
 
 Name:           ghc-rpm-macros
-Version:        2.0.9
+Version:        2.0.10
 Release:        1%{?dist}
 Summary:        RPM macros for building Haskell packages for GHC
 
@@ -212,6 +212,9 @@ EOF
 
 
 %changelog
+* Thu Jun 18 2020 Jens Petersen <petersen@redhat.com> - 2.0.10-1
+- cabal-tweak script now output errors to stderr
+
 * Thu Jun  4 2020 Jens Petersen <petersen@redhat.com> - 2.0.9-1
 - doc subpackages should own /usr/share/doc/ghc/, /usr/share/doc/ghc/html/,
   and /usr/share/doc/ghc/html/libraries/ (#1795526)