https://bugs.gentoo.org/963094
--- a/rdup-simple
+++ b/rdup-simple
@@ -179,7 +179,7 @@ fi
 [ $# -lt 2 ] && usage && exit
 
 if $mcrypt; then
-    if ! which mcrypt 2>/dev/null 1>&2; then
+    if ! command -v mcrypt > /dev/null; then
 	echo2 "Mcrypt not found, can not continue"
 	exit 1
     fi
--- a/testsuite/rdup/rdup.rdup-up.data
+++ b/testsuite/rdup/rdup.rdup-up.data
@@ -1204,7 +1204,7 @@ function clone() {
 
 # try to find the specific cmd
 function find_cmd {
-        which "${i}" >/dev/null
+        command -v "${i}" >/dev/null
         if [ $? -ne 0 ]; then                
                 err "[fatal] CmdDepend \"$i\" could not be satisfied: not found. Abort."
                 cleanup; exit 1  
@@ -1330,7 +1330,7 @@ if [ $goal = "create" ]; then
 # get all files with the same basename except those that ends in .tpkg
 
         # check for shar
-        which tar >/dev/null
+        command -v tar >/dev/null
         if [ $? -ne 0 ]; then
                 err "[fatal] Tar command not found. Abort."
                 cd $TPKG_CURRENT; exit 1
@@ -1524,7 +1524,7 @@ if [ ! -f $dsc_file ]; then
         cleanup; exit 1
 fi
 
-SHELL=`which bash`
+SHELL=`command -v bash`
 if [ -z ${SHELL} ]; then
        SHELL=/usr/local/bin/bash
        if [ ! -x $SHELL ]; then
--- a/testsuite/rdup/rdup.simple.helper
+++ b/testsuite/rdup/rdup.simple.helper
@@ -5,7 +5,7 @@
 # these
 PATH=$PWD:$PATH
 
-if ! which gpg 2>/dev/null 1>&2; then
+if ! command -v gpg 2>/dev/null 1>&2; then
     exit 0
 fi
 
--- a/testsuite/rdup/rdup.simple3.helper
+++ b/testsuite/rdup/rdup.simple3.helper
@@ -2,7 +2,7 @@
 
 PATH=$PWD:$PATH
 
-if ! which gpg 2>/dev/null 1>&2; then
+if ! command -v gpg 2>/dev/null 1>&2; then
     exit 0
 fi