diff --git a/config.h b/config.h
index 97507a3..8e6da20 100644
--- a/config.h
+++ b/config.h
@@ -77,7 +77,7 @@
 #define PACKAGE_NAME "r3"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "r3 1.0"
+#define PACKAGE_STRING "r3 1.0.0"
 
 /* Define to the one symbol short name of this package. */
 #define PACKAGE_TARNAME "r3"
@@ -86,13 +86,13 @@
 #define PACKAGE_URL ""
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "1.0"
+#define PACKAGE_VERSION "1.0.0"
 
 /* Define to 1 if you have the ANSI C header files. */
 #define STDC_HEADERS 1
 
 /* Version number of package */
-#define VERSION "1.0"
+#define VERSION "1.0.0"
 
 /* Define to `__inline__' or `__inline' if that's what the C compiler
    calls it, or to nothing if 'inline' is not supported under any name.  */
diff --git a/config.status b/config.status
index d91d60f..78b3823 100755
--- a/config.status
+++ b/config.status
@@ -380,7 +380,7 @@ exec 6>&1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by r3 $as_me 1.0, which was
+This file was extended by r3 $as_me 1.0.0, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -427,9 +427,9 @@ $config_commands
 
 Report bugs to the package provider."
 
-ac_cs_config="'--enable-graphviz'"
+ac_cs_config=""
 ac_cs_version="\
-r3 config.status 1.0
+r3 config.status 1.0.0
 configured by ./configure, generated by GNU Autoconf 2.69,
   with options \"$ac_cs_config\"
 
@@ -519,7 +519,7 @@ if $ac_cs_silent; then
 fi
 
 if $ac_cs_recheck; then
-  set X /bin/sh './configure'  '--enable-graphviz' $ac_configure_extra_args --no-create --no-recursion
+  set X /bin/sh './configure'  $ac_configure_extra_args --no-create --no-recursion
   shift
   $as_echo "running CONFIG_SHELL=/bin/sh $*" >&6
   CONFIG_SHELL='/bin/sh'
@@ -728,7 +728,7 @@ fi
 
 
     PACKAGE='r3'
-    VERSION='1.0'
+    VERSION='1.0.0'
     TIMESTAMP=''
     RM='rm -f'
     ofile='libtool'
@@ -818,12 +818,12 @@ S["am__EXEEXT_TRUE"]="#"
 S["LTLIBOBJS"]=""
 S["DEPS_LIBS"]="-L/opt/local/lib -lpcre -lcheck "
 S["DEPS_CFLAGS"]="-D_THREAD_SAFE -I/opt/local/include "
-S["DEBUG_FALSE"]=""
-S["DEBUG_TRUE"]="#"
-S["ENABLE_GRAPHVIZ_FALSE"]="#"
-S["ENABLE_GRAPHVIZ_TRUE"]=""
-S["GVC_DEPS_LIBS"]="-L/opt/local/lib -lgvc -lcgraph -lcdt "
-S["GVC_DEPS_CFLAGS"]="-I/opt/local/include/graphviz "
+S["ENABLE_GRAPHVIZ_FALSE"]=""
+S["ENABLE_GRAPHVIZ_TRUE"]="#"
+S["ENABLE_DEBUG_FALSE"]=""
+S["ENABLE_DEBUG_TRUE"]="#"
+S["GVC_DEPS_LIBS"]=""
+S["GVC_DEPS_CFLAGS"]=""
 S["PKG_CONFIG_LIBDIR"]=""
 S["PKG_CONFIG_PATH"]=""
 S["PKG_CONFIG"]="/opt/local/bin/pkg-config"
@@ -899,7 +899,7 @@ S["AUTOHEADER"]="${SHELL} /Users/c9s/work/php/r3/missing autoheader"
 S["AUTOMAKE"]="${SHELL} /Users/c9s/work/php/r3/missing automake-1.14"
 S["AUTOCONF"]="${SHELL} /Users/c9s/work/php/r3/missing autoconf"
 S["ACLOCAL"]="${SHELL} /Users/c9s/work/php/r3/missing aclocal-1.14"
-S["VERSION"]="1.0"
+S["VERSION"]="1.0.0"
 S["PACKAGE"]="r3"
 S["CYGPATH_W"]="echo"
 S["am__isrc"]=""
@@ -938,8 +938,8 @@ S["prefix"]="/usr/local"
 S["exec_prefix"]="${prefix}"
 S["PACKAGE_URL"]=""
 S["PACKAGE_BUGREPORT"]=""
-S["PACKAGE_STRING"]="r3 1.0"
-S["PACKAGE_VERSION"]="1.0"
+S["PACKAGE_STRING"]="r3 1.0.0"
+S["PACKAGE_VERSION"]="1.0.0"
 S["PACKAGE_TARNAME"]="r3"
 S["PACKAGE_NAME"]="r3"
 S["PATH_SEPARATOR"]=":"
@@ -987,12 +987,12 @@ cat >"$ac_tmp/defines.awk" <<\_ACAWK ||
 BEGIN {
 D["PACKAGE_NAME"]=" \"r3\""
 D["PACKAGE_TARNAME"]=" \"r3\""
-D["PACKAGE_VERSION"]=" \"1.0\""
-D["PACKAGE_STRING"]=" \"r3 1.0\""
+D["PACKAGE_VERSION"]=" \"1.0.0\""
+D["PACKAGE_STRING"]=" \"r3 1.0.0\""
 D["PACKAGE_BUGREPORT"]=" \"\""
 D["PACKAGE_URL"]=" \"\""
 D["PACKAGE"]=" \"r3\""
-D["VERSION"]=" \"1.0\""
+D["VERSION"]=" \"1.0.0\""
 D["STDC_HEADERS"]=" 1"
 D["HAVE_SYS_TYPES_H"]=" 1"
 D["HAVE_SYS_STAT_H"]=" 1"
diff --git a/configure b/configure
index e790ebe..e48a232 100755
--- a/configure
+++ b/configure
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.69 for r3 1.0.
+# Generated by GNU Autoconf 2.69 for r3 1.0.0.
 #
 #
 # Copyright (C) 1992-1996, 1998-2012 Free Software Foundation, Inc.
@@ -587,8 +587,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='r3'
 PACKAGE_TARNAME='r3'
-PACKAGE_VERSION='1.0'
-PACKAGE_STRING='r3 1.0'
+PACKAGE_VERSION='1.0.0'
+PACKAGE_STRING='r3 1.0.0'
 PACKAGE_BUGREPORT=''
 PACKAGE_URL=''
 
@@ -633,10 +633,10 @@ am__EXEEXT_TRUE
 LTLIBOBJS
 DEPS_LIBS
 DEPS_CFLAGS
-DEBUG_FALSE
-DEBUG_TRUE
 ENABLE_GRAPHVIZ_FALSE
 ENABLE_GRAPHVIZ_TRUE
+ENABLE_DEBUG_FALSE
+ENABLE_DEBUG_TRUE
 GVC_DEPS_LIBS
 GVC_DEPS_CFLAGS
 PKG_CONFIG_LIBDIR
@@ -1331,7 +1331,7 @@ if test "$ac_init_help" = "long"; then
   # Omit some internal or obsolete options to make the list less imposing.
   # This message is too long to be a string in the A/UX 3.1 sh.
   cat <<_ACEOF
-\`configure' configures r3 1.0 to adapt to many kinds of systems.
+\`configure' configures r3 1.0.0 to adapt to many kinds of systems.
 
 Usage: $0 [OPTION]... [VAR=VALUE]...
 
@@ -1401,7 +1401,7 @@ fi
 
 if test -n "$ac_init_help"; then
   case $ac_init_help in
-     short | recursive ) echo "Configuration of r3 1.0:";;
+     short | recursive ) echo "Configuration of r3 1.0.0:";;
    esac
   cat <<\_ACEOF
 
@@ -1421,7 +1421,7 @@ Optional Features:
                           speeds up one-time build
   --disable-libtool-lock  avoid locking (might break parallel builds)
   --enable-graphviz       enable graphviz support
-  --enable-debug    Turn on debugging
+  --enable-debug          enable debug
 
 Optional Packages:
   --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -1520,7 +1520,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
   cat <<\_ACEOF
-r3 configure 1.0
+r3 configure 1.0.0
 generated by GNU Autoconf 2.69
 
 Copyright (C) 2012 Free Software Foundation, Inc.
@@ -1939,7 +1939,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
 
-It was created by r3 $as_me 1.0, which was
+It was created by r3 $as_me 1.0.0, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   $ $0 $@
@@ -2806,7 +2806,7 @@ fi
 
 # Define the identity of the package.
  PACKAGE='r3'
- VERSION='1.0'
+ VERSION='1.0.0'
 
 
 cat >>confdefs.h <<_ACEOF
@@ -13141,10 +13141,6 @@ $as_echo "no" >&6; }
 	fi
 fi
 
-# AC_ARG_ENABLE([graphviz],
-#   AS_HELP_STRING([--enable-graphviz], [Enable graphviz feature]))
-
-
 # Check whether --enable-graphviz was given.
 if test "${enable_graphviz+set}" = set; then :
   enableval=$enable_graphviz;
@@ -13152,11 +13148,6 @@ else
   enable_graphviz=unset
 fi
 
-
-
-
-
-
 if test "x$enable_graphviz" != "xunset" ; then
 
 pkg_failed=no
@@ -13251,6 +13242,22 @@ $as_echo "yes" >&6; }
 fi
 
 
+fi
+
+# Check whether --enable-debug was given.
+if test "${enable_debug+set}" = set; then :
+  enableval=$enable_debug;
+else
+  enable_debug=unset
+fi
+
+
+ if test "x$enable_debug" = "xyes"; then
+  ENABLE_DEBUG_TRUE=
+  ENABLE_DEBUG_FALSE='#'
+else
+  ENABLE_DEBUG_TRUE='#'
+  ENABLE_DEBUG_FALSE=
 fi
 
  if test "x$enable_graphviz" = "xyes"; then
@@ -13263,44 +13270,6 @@ fi
 
 
 
-# Check whether --enable-debug was given.
-if test "${enable_debug+set}" = set; then :
-  enableval=$enable_debug; case "${enableval}" in
-  yes) enable_debug=true ;;
-  no)  enable_debug=false ;;
-  *) as_fn_error $? "bad value ${enableval} for --enable-debug" "$LINENO" 5 ;;
-esac
-else
-  enable_debug=false
-fi
-
- if test x$enable_debug = xtrue; then
-  DEBUG_TRUE=
-  DEBUG_FALSE='#'
-else
-  DEBUG_TRUE='#'
-  DEBUG_FALSE=
-fi
-
-
-
-#  fi],[
-#     AC_DEFINE(ENABLE_GRAPHVIZ, 0, [Graphviz support disabled.])
-#     AM_CONDITIONAL(ENABLE_GRAPHVIZ, 0)
-# AC_ARG_ENABLE(graphviz,
-#  [ --enable-graphvizviz Build with graphviz support],
-#  [if test x$enableval != xyes; then
-#     AC_DEFINE(ENABLE_GRAPHVIZ, 1, [Graphviz support enabled.])
-#     PKG_CHECK_MODULES(GVC_DEPS, [libgvc])
-#     AC_SUBST(GVC_DEPS_CFLAGS)
-#     AC_SUBST(GVC_DEPS_LIBS)
-#     AM_CONDITIONAL(ENABLE_GRAPHVIZ, 1)
-#  fi],[
-#     AC_DEFINE(ENABLE_GRAPHVIZ, 0, [Graphviz support disabled.])
-#     AM_CONDITIONAL(ENABLE_GRAPHVIZ, 0)
-#  ])
-
-
 
 pkg_failed=no
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for DEPS" >&5
@@ -13537,12 +13506,12 @@ if test -z "${HAVE_CHECK_TRUE}" && test -z "${HAVE_CHECK_FALSE}"; then
   as_fn_error $? "conditional \"HAVE_CHECK\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
-if test -z "${ENABLE_GRAPHVIZ_TRUE}" && test -z "${ENABLE_GRAPHVIZ_FALSE}"; then
-  as_fn_error $? "conditional \"ENABLE_GRAPHVIZ\" was never defined.
+if test -z "${ENABLE_DEBUG_TRUE}" && test -z "${ENABLE_DEBUG_FALSE}"; then
+  as_fn_error $? "conditional \"ENABLE_DEBUG\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
-if test -z "${DEBUG_TRUE}" && test -z "${DEBUG_FALSE}"; then
-  as_fn_error $? "conditional \"DEBUG\" was never defined.
+if test -z "${ENABLE_GRAPHVIZ_TRUE}" && test -z "${ENABLE_GRAPHVIZ_FALSE}"; then
+  as_fn_error $? "conditional \"ENABLE_GRAPHVIZ\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
 
@@ -13942,7 +13911,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by r3 $as_me 1.0, which was
+This file was extended by r3 $as_me 1.0.0, which was
 generated by GNU Autoconf 2.69.  Invocation command line was
 
   CONFIG_FILES    = $CONFIG_FILES
@@ -14008,7 +13977,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-r3 config.status 1.0
+r3 config.status 1.0.0
 configured by $0, generated by GNU Autoconf 2.69,
   with options \\"\$ac_cs_config\\"
 
diff --git a/configure.ac b/configure.ac
index b361f96..6574fa6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,12 @@ if test "x$enable_graphviz" != "xunset" ; then
    AC_SUBST(GVC_DEPS_LIBS)
 fi
 
+AC_ARG_ENABLE(debug,
+              AS_HELP_STRING([--enable-debug],
+                             [enable debug]),
+              , enable_debug=unset)
+
+AM_CONDITIONAL(ENABLE_DEBUG, test "x$enable_debug" = "xyes")
 AM_CONDITIONAL(ENABLE_GRAPHVIZ, test "x$enable_graphviz" = "xyes")
 
 
diff --git a/libtool b/libtool
index 11e19cd..6dffe9d 100755
--- a/libtool
+++ b/libtool
@@ -1,7 +1,7 @@
 #! /bin/sh
 
 # libtool - Provide generalized library-building support services.
-# Generated automatically by config.status (r3) 1.0
+# Generated automatically by config.status (r3) 1.0.0
 # Libtool was configured on host c9smba.local:
 # NOTE: Changes made to this file will be lost: look at ltmain.sh.
 #
diff --git a/src/Makefile.am b/src/Makefile.am
index 8decc22..3f1094f 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -5,6 +5,10 @@ libr3_la_SOURCES = node.c edge.c list.c str.c token.c
 libr3_la_LIBADD=$(DEPS_LIBS)
 AM_CFLAGS=$(DEPS_CFLAGS) -I$(top_builddir) -I$(top_builddir)/include -Wall
 
+if ENABLE_DEBUG
+AM_CFLAGS += -g
+endif
+
 if ENABLE_GRAPHVIZ
 libr3_la_SOURCES += gvc.c
 libr3_la_LIBADD += $(GVC_DEPS_LIBS)
diff --git a/src/Makefile.in b/src/Makefile.in
index dead82c..16021ee 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -78,9 +78,10 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
-@ENABLE_GRAPHVIZ_TRUE@am__append_1 = gvc.c
-@ENABLE_GRAPHVIZ_TRUE@am__append_2 = $(GVC_DEPS_LIBS)
-@ENABLE_GRAPHVIZ_TRUE@am__append_3 = $(GVC_DEPS_CFLAGS)
+@ENABLE_DEBUG_TRUE@am__append_1 = -g
+@ENABLE_GRAPHVIZ_TRUE@am__append_2 = gvc.c
+@ENABLE_GRAPHVIZ_TRUE@am__append_3 = $(GVC_DEPS_LIBS)
+@ENABLE_GRAPHVIZ_TRUE@am__append_4 = $(GVC_DEPS_CFLAGS)
 subdir = src
 DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
 	$(top_srcdir)/depcomp
@@ -322,10 +323,10 @@ top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 lib_LTLIBRARIES = libr3.la
 # lib_LIBRARIES = libr3.a
-libr3_la_SOURCES = node.c edge.c list.c str.c token.c $(am__append_1)
-libr3_la_LIBADD = $(DEPS_LIBS) $(am__append_2)
+libr3_la_SOURCES = node.c edge.c list.c str.c token.c $(am__append_2)
+libr3_la_LIBADD = $(DEPS_LIBS) $(am__append_3)
 AM_CFLAGS = $(DEPS_CFLAGS) -I$(top_builddir) -I$(top_builddir)/include \
-	-Wall $(am__append_3)
+	-Wall $(am__append_1) $(am__append_4)
 all: all-am
 
 .SUFFIXES:
diff --git a/src/str.c b/src/str.c
index 6437777..588b0cc 100644
--- a/src/str.c
+++ b/src/str.c
@@ -54,7 +54,7 @@ bool contains_slug(char * str) {
  */
 char * compile_slug(char * str, int len)
 {
-    char *s1 = NULL, *s2 = NULL, *i = NULL, *o = NULL;
+    char *s1 = NULL, *s2 = NULL, *o = NULL;
     char *pat = NULL;
     char sep = '/';