diff --git a/configure b/configure
index a1ac7ab..468bc9d 100755
--- a/configure
+++ b/configure
@@ -476,7 +476,7 @@
 # include <unistd.h>
 #endif"
 
-ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS LLVM_COPYRIGHT subdirs build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os OS ARCH ENDIAN CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT ENABLE_OPTIMIZED JIT ENABLE_DOXYGEN LLVMGCCDIR CPP CXX CXXFLAGS ac_ct_CXX LEX LEXLIB LEX_OUTPUT_ROOT FLEX YACC BISON ifGNUmake LN_S DATE FIND GREP MKDIR MV PAX RANLIB ac_ct_RANLIB RM SED TAR INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA BZIP2 DOT DOXYGEN ETAGS GROFF GZIP POD2HTML POD2MAN PYTHON QMTEST RUNTEST tclsh TCLSH ZIP EGREP INSTALL_LTDL_TRUE INSTALL_LTDL_FALSE CONVENIENCE_LTDL_TRUE CONVENIENCE_LTDL_FALSE LIBADD_DL ECHO AR ac_ct_AR STRIP ac_ct_STRIP CXXCPP F77 FFLAGS ac_ct_F77 LIBTOOL ETAGSFLAGS ALLOCA MMAP_FILE LLVMGCC LLVMCC1 LLVMCC1PLUS SHLIBEXT LLVM_PREFIX LLVM_BINDIR LLVM_LIBDIR LLVM_DATADIR LLVM_DOCSDIR LLVM_ETCDIR LLVM_INCLUDEDIR LLVM_INFODIR LLVM_MANDIR LLVM_CONFIGTIME LIBOBJS LTLIBOBJS'
+ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS LLVM_COPYRIGHT subdirs build build_cpu build_vendor build_os host host_cpu host_vendor host_os target target_cpu target_vendor target_os OS ARCH ENDIAN CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT ENABLE_OPTIMIZED JIT ENABLE_DOXYGEN LLVMGCCDIR CPP CXX CXXFLAGS ac_ct_CXX LEX LEXLIB LEX_OUTPUT_ROOT FLEX YACC BISON ifGNUmake LN_S DATE FIND GREP MKDIR MV PAX RANLIB ac_ct_RANLIB RM SED TAR INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA BZIP2 DOT DOXYGEN ETAGS GROFF GZIP POD2HTML POD2MAN PYTHON QMTEST RUNTEST TCLSH ZIP EGREP INSTALL_LTDL_TRUE INSTALL_LTDL_FALSE CONVENIENCE_LTDL_TRUE CONVENIENCE_LTDL_FALSE LIBADD_DL ECHO AR ac_ct_AR STRIP ac_ct_STRIP CXXCPP F77 FFLAGS ac_ct_F77 LIBTOOL ETAGSFLAGS ALLOCA MMAP_FILE LLVMGCC LLVMCC1 LLVMCC1PLUS SHLIBEXT LLVM_PREFIX LLVM_BINDIR LLVM_LIBDIR LLVM_DATADIR LLVM_DOCSDIR LLVM_ETCDIR LLVM_INCLUDEDIR LLVM_INFODIR LLVM_MANDIR LLVM_CONFIGTIME LIBOBJS LTLIBOBJS'
 ac_subst_files=''
 
 # Initialize some variables set by options.
@@ -5457,17 +5457,16 @@
 fi
 
 
-dirlist=".. ../../ ../../../ ../../../../ ../../../../../ ../../../../../../ ../
-../../../../../.. ../../../../../../../.. ../../../../../../../../.. ../../../..
-/../../../../../.."
 no_itcl=true
-echo "$as_me:$LINENO: checking for the tclsh program" >&5
-echo $ECHO_N "checking for the tclsh program... $ECHO_C" >&6
+echo "$as_me:$LINENO: checking for the tclsh program in tclinclude directory" >&5
+echo $ECHO_N "checking for the tclsh program in tclinclude directory... $ECHO_C" >&6
 
 # Check whether --with-tclinclude or --without-tclinclude was given.
 if test "${with_tclinclude+set}" = set; then
   withval="$with_tclinclude"
   with_tclinclude=${withval}
+else
+  with_tclinclude=''
 fi;
 if test "${ac_cv_path_tclsh+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
@@ -5485,38 +5484,21 @@
   fi
 fi
 
-fi
-
-
 if test x"${ac_cv_path_tclsh}" = x ; then
-        for i in $dirlist; do
-        if test -n "`ls -dr $srcdir/$i/tcl* 2>/dev/null`" ; then
-            tclpath=$srcdir/$i
-            break
-        fi
-    done
-
-            for i in `ls -dr $tclpath/tcl* 2>/dev/null ` ; do
-        if test -f $i/src/tclsh ; then
-          ac_cv_path_tclsh=`(cd $i/src; pwd)`/tclsh
-          break
-        fi
-    done
-fi
-
-if test x"${ac_cv_path_tclsh}" = x ; then
-   echo "$as_me:$LINENO: result: none" >&5
+  echo "$as_me:$LINENO: result: none" >&5
 echo "${ECHO_T}none" >&6
-   # Extract the first word of "tclsh", so it can be a program name with args.
-set dummy tclsh; ac_word=$2
+  for ac_prog in tclsh tclsh8.4 tclsh8.4.8 tclsh8.4.7 tclsh8.4.6 tclsh8.4.5 tclsh8.4.4 tclsh8.4.3 tclsh8.4.2 tclsh8.4.1 tclsh8.4.0 tclsh8.3 tclsh8.3.5 tclsh8.3.4 tclsh8.3.3 .tclsh8.3.2 tclsh8.3.1 tclsh8.3.0
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
 echo "$as_me:$LINENO: checking for $ac_word" >&5
 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6
-if test "${ac_cv_path_tclsh+set}" = set; then
+if test "${ac_cv_path_TCLSH+set}" = set; then
   echo $ECHO_N "(cached) $ECHO_C" >&6
 else
-  case $tclsh in
+  case $TCLSH in
   [\\/]* | ?:[\\/]*)
-  ac_cv_path_tclsh="$tclsh" # Let the user override the test with a path.
+  ac_cv_path_TCLSH="$TCLSH" # Let the user override the test with a path.
   ;;
   *)
   as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
@@ -5526,7 +5508,7 @@
   test -z "$as_dir" && as_dir=.
   for ac_exec_ext in '' $ac_executable_extensions; do
   if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
-    ac_cv_path_tclsh="$as_dir/$ac_word$ac_exec_ext"
+    ac_cv_path_TCLSH="$as_dir/$ac_word$ac_exec_ext"
     echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
     break 2
   fi
@@ -5536,22 +5518,32 @@
   ;;
 esac
 fi
-tclsh=$ac_cv_path_tclsh
+TCLSH=$ac_cv_path_TCLSH
 
-if test -n "$tclsh"; then
-  echo "$as_me:$LINENO: result: $tclsh" >&5
-echo "${ECHO_T}$tclsh" >&6
+if test -n "$TCLSH"; then
+  echo "$as_me:$LINENO: result: $TCLSH" >&5
+echo "${ECHO_T}$TCLSH" >&6
 else
   echo "$as_me:$LINENO: result: no" >&5
 echo "${ECHO_T}no" >&6
 fi
 
-else
-   echo "$as_me:$LINENO: result: ${ac_cv_path_tclsh}" >&5
-echo "${ECHO_T}${ac_cv_path_tclsh}" >&6
-fi
-TCLSH="${ac_cv_path_tclsh}"
+  test -n "$TCLSH" && break
+done
 
+  if test x"${TCLSH}" = x ; then
+    ac_cv_path_tclsh='';
+  else
+    ac_cv_path_tclsh="${TCLSH}";
+  fi
+else
+  echo "$as_me:$LINENO: result: ${ac_cv_path_tclsh}" >&5
+echo "${ECHO_T}${ac_cv_path_tclsh}" >&6
+  TCLSH="${ac_cv_path_tclsh}"
+
+fi
+
+fi
 
 # Extract the first word of "zip", so it can be a program name with args.
 set dummy zip; ac_word=$2
@@ -8198,7 +8190,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 8201 "configure"
+#line 8193 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -10189,7 +10181,7 @@
   ;;
 *-*-irix6*)
   # Find out which ABI we are using.
-  echo '#line 10192 "configure"' > conftest.$ac_ext
+  echo '#line 10184 "configure"' > conftest.$ac_ext
   if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
   (eval $ac_compile) 2>&5
   ac_status=$?
@@ -10674,7 +10666,7 @@
 
 
 # Provide some information about the compiler.
-echo "$as_me:10677:" \
+echo "$as_me:10669:" \
      "checking for Fortran 77 compiler version" >&5
 ac_compiler=`set X $ac_compile; echo $2`
 { (eval echo "$as_me:$LINENO: \"$ac_compiler --version </dev/null >&5\"") >&5
@@ -11731,11 +11723,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:11734: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:11726: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:11738: \$? = $ac_status" >&5
+   echo "$as_me:11730: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -11974,11 +11966,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:11977: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:11969: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:11981: \$? = $ac_status" >&5
+   echo "$as_me:11973: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -12034,11 +12026,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:12037: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:12029: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:12041: \$? = $ac_status" >&5
+   echo "$as_me:12033: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -14219,7 +14211,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 14222 "configure"
+#line 14214 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -14317,7 +14309,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 14320 "configure"
+#line 14312 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -16510,11 +16502,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16513: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16505: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:16517: \$? = $ac_status" >&5
+   echo "$as_me:16509: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -16570,11 +16562,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:16573: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:16565: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:16577: \$? = $ac_status" >&5
+   echo "$as_me:16569: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -17931,7 +17923,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 17934 "configure"
+#line 17926 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -18029,7 +18021,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 18032 "configure"
+#line 18024 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -18866,11 +18858,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:18869: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:18861: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:18873: \$? = $ac_status" >&5
+   echo "$as_me:18865: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -18926,11 +18918,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:18929: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:18921: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:18933: \$? = $ac_status" >&5
+   echo "$as_me:18925: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -20965,11 +20957,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:20968: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:20960: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:20972: \$? = $ac_status" >&5
+   echo "$as_me:20964: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -21208,11 +21200,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:21211: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:21203: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>conftest.err)
    ac_status=$?
    cat conftest.err >&5
-   echo "$as_me:21215: \$? = $ac_status" >&5
+   echo "$as_me:21207: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s "$ac_outfile"; then
      # The compiler can only warn and ignore the option if not recognized
      # So say no if there are warnings
@@ -21268,11 +21260,11 @@
    -e 's:.*FLAGS}? :&$lt_compiler_flag :; t' \
    -e 's: [^ ]*conftest\.: $lt_compiler_flag&:; t' \
    -e 's:$: $lt_compiler_flag:'`
-   (eval echo "\"\$as_me:21271: $lt_compile\"" >&5)
+   (eval echo "\"\$as_me:21263: $lt_compile\"" >&5)
    (eval "$lt_compile" 2>out/conftest.err)
    ac_status=$?
    cat out/conftest.err >&5
-   echo "$as_me:21275: \$? = $ac_status" >&5
+   echo "$as_me:21267: \$? = $ac_status" >&5
    if (exit $ac_status) && test -s out/conftest2.$ac_objext
    then
      # The compiler can only warn and ignore the option if not recognized
@@ -23453,7 +23445,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 23456 "configure"
+#line 23448 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -23551,7 +23543,7 @@
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<EOF
-#line 23554 "configure"
+#line 23546 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -30338,7 +30330,6 @@
 s,@PYTHON@,$PYTHON,;t t
 s,@QMTEST@,$QMTEST,;t t
 s,@RUNTEST@,$RUNTEST,;t t
-s,@tclsh@,$tclsh,;t t
 s,@TCLSH@,$TCLSH,;t t
 s,@ZIP@,$ZIP,;t t
 s,@EGREP@,$EGREP,;t t