diff --git a/configure b/configure
index a550302..b3de471 100755
--- a/configure
+++ b/configure
@@ -11,11 +11,21 @@ else
     TMPDIR1="/tmp"
 fi
 
-TMPC="${TMPDIR1}/tcc-conf-${RANDOM}-$$-${RANDOM}.c"
-TMPO="${TMPDIR1}/tcc-conf-${RANDOM}-$$-${RANDOM}.o"
-TMPE="${TMPDIR1}/tcc-conf-${RANDOM}-$$-${RANDOM}"
-TMPS="${TMPDIR1}/tcc-conf-${RANDOM}-$$-${RANDOM}.S"
-TMPH="${TMPDIR1}/tcc-conf-${RANDOM}-$$-${RANDOM}.h"
+RDM1="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+RDM2="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+TMPC="${TMPDIR1}/tcc-conf-${RDM1}-$$-${RDM2}.c"
+RDM1="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+RDM2="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+TMPO="${TMPDIR1}/tcc-conf-${RDM1}-$$-${RDM2}.o"
+RDM1="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+RDM2="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+TMPE="${TMPDIR1}/tcc-conf-${RDM1}-$$-${RDM2}"
+RDM1="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+RDM2="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+TMPS="${TMPDIR1}/tcc-conf-${RDM1}-$$-${RDM2}.S"
+RDM1="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+RDM2="$(dd if=/dev/urandom count=1 2> /dev/null | cksum | cut -f1 -d" " )"
+TMPH="${TMPDIR1}/tcc-conf-${RDM1}-$$-${RDM2}.h"
 
 # default parameters
 build_cross="no"
diff --git a/tests/gcctestsuite.sh b/tests/gcctestsuite.sh
index bd9204b..f3cc538 100644
--- a/tests/gcctestsuite.sh
+++ b/tests/gcctestsuite.sh
@@ -8,11 +8,11 @@ nb_failed="0"
 for src in $TESTSUITE_PATH/compile/*.c ; do
   echo $TCC -o /tmp/test.o -c $src 
   $TCC -o /tmp/test.o -c $src >> tcc.log 2>&1
-  if [ "$?" == "0" ] ; then
+  if [ "$?" = "0" ] ; then
      result="PASS"
   else
      result="FAIL"
-     nb_failed=$[ $nb_failed + 1 ]
+     nb_failed=$(( $nb_failed + 1 ))
   fi
   echo "$result: $src"  >> tcc.sum
 done
@@ -20,11 +20,11 @@ done
 for src in $TESTSUITE_PATH/execute/*.c ; do
   echo $TCC $src 
   $TCC $src >> tcc.log 2>&1
-  if [ "$?" == "0" ] ; then
+  if [ "$?" = "0" ] ; then
      result="PASS"
   else
      result="FAIL"
-     nb_failed=$[ $nb_failed + 1 ]
+     nb_failed=$(( $nb_failed + 1 ))
   fi
   echo "$result: $src"  >> tcc.sum
 done