diff --git a/ChangeLog b/ChangeLog
index 2dc56bd30..fa93a66eb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2006-05-27  Mickael Remond  <mickael.remond@process-one.net>
+
+	* src/configure.ac: Added an optional check for krb5.h in
+	configure. ejabberd can now be build directly on RedHat and
+	OpenBSD.
+
 2006-05-27  Alexey Shchepin  <alexey@sevcom.net>
 
 	* src/msgs/sk.msg: Slovak translation (thanks to Juraj Michalek
diff --git a/src/configure b/src/configure
index 3468e35c9..61be20d06 100755
--- a/src/configure
+++ b/src/configure
@@ -4799,6 +4799,160 @@ fi
 
 fi
 
+# If ssl is kerberized it need krb5.h
+KRB5_INCLUDE="`krb5-config --cflags 2>/dev/null`"
+if test -n "$KRB5_INCLUDE" ; then
+        CPPFLAGS="$CPPFLAGS $KRB5_INCLUDE"
+else
+        #         For RedHat                                  For BSD
+        for D in /usr/kerberos/include /usr/include/kerberos /usr/include/kerberosV
+        do
+                if test -d $D ; then
+                        CPPFLAGS="$CPPFLAGS -I$D"
+                fi
+        done
+fi
+echo MREMOND: $CPPFLAGS
+if test "${ac_cv_header_krb5_h+set}" = set; then
+  echo "$as_me:$LINENO: checking for krb5.h" >&5
+echo $ECHO_N "checking for krb5.h... $ECHO_C" >&6
+if test "${ac_cv_header_krb5_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+fi
+echo "$as_me:$LINENO: result: $ac_cv_header_krb5_h" >&5
+echo "${ECHO_T}$ac_cv_header_krb5_h" >&6
+else
+  # Is the header compilable?
+echo "$as_me:$LINENO: checking krb5.h usability" >&5
+echo $ECHO_N "checking krb5.h usability... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+$ac_includes_default
+#include <krb5.h>
+_ACEOF
+rm -f conftest.$ac_objext
+if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5
+  (eval $ac_compile) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag"
+			 || test ! -s conftest.err'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest.$ac_objext'
+  { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  ac_header_compiler=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+ac_header_compiler=no
+fi
+rm -f conftest.err conftest.$ac_objext conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_compiler" >&5
+echo "${ECHO_T}$ac_header_compiler" >&6
+
+# Is the header present?
+echo "$as_me:$LINENO: checking krb5.h presence" >&5
+echo $ECHO_N "checking krb5.h presence... $ECHO_C" >&6
+cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+#include <krb5.h>
+_ACEOF
+if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5
+  (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } >/dev/null; then
+  if test -s conftest.err; then
+    ac_cpp_err=$ac_c_preproc_warn_flag
+    ac_cpp_err=$ac_cpp_err$ac_c_werror_flag
+  else
+    ac_cpp_err=
+  fi
+else
+  ac_cpp_err=yes
+fi
+if test -z "$ac_cpp_err"; then
+  ac_header_preproc=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+  ac_header_preproc=no
+fi
+rm -f conftest.err conftest.$ac_ext
+echo "$as_me:$LINENO: result: $ac_header_preproc" >&5
+echo "${ECHO_T}$ac_header_preproc" >&6
+
+# So?  What about this header?
+case $ac_header_compiler:$ac_header_preproc:$ac_c_preproc_warn_flag in
+  yes:no: )
+    { echo "$as_me:$LINENO: WARNING: krb5.h: accepted by the compiler, rejected by the preprocessor!" >&5
+echo "$as_me: WARNING: krb5.h: accepted by the compiler, rejected by the preprocessor!" >&2;}
+    { echo "$as_me:$LINENO: WARNING: krb5.h: proceeding with the compiler's result" >&5
+echo "$as_me: WARNING: krb5.h: proceeding with the compiler's result" >&2;}
+    ac_header_preproc=yes
+    ;;
+  no:yes:* )
+    { echo "$as_me:$LINENO: WARNING: krb5.h: present but cannot be compiled" >&5
+echo "$as_me: WARNING: krb5.h: present but cannot be compiled" >&2;}
+    { echo "$as_me:$LINENO: WARNING: krb5.h:     check for missing prerequisite headers?" >&5
+echo "$as_me: WARNING: krb5.h:     check for missing prerequisite headers?" >&2;}
+    { echo "$as_me:$LINENO: WARNING: krb5.h: see the Autoconf documentation" >&5
+echo "$as_me: WARNING: krb5.h: see the Autoconf documentation" >&2;}
+    { echo "$as_me:$LINENO: WARNING: krb5.h:     section \"Present But Cannot Be Compiled\"" >&5
+echo "$as_me: WARNING: krb5.h:     section \"Present But Cannot Be Compiled\"" >&2;}
+    { echo "$as_me:$LINENO: WARNING: krb5.h: proceeding with the preprocessor's result" >&5
+echo "$as_me: WARNING: krb5.h: proceeding with the preprocessor's result" >&2;}
+    { echo "$as_me:$LINENO: WARNING: krb5.h: in the future, the compiler will take precedence" >&5
+echo "$as_me: WARNING: krb5.h: in the future, the compiler will take precedence" >&2;}
+    (
+      cat <<\_ASBOX
+## --------------------------------- ##
+## Report this to BUG-REPORT-ADDRESS ##
+## --------------------------------- ##
+_ASBOX
+    ) |
+      sed "s/^/$as_me: WARNING:     /" >&2
+    ;;
+esac
+echo "$as_me:$LINENO: checking for krb5.h" >&5
+echo $ECHO_N "checking for krb5.h... $ECHO_C" >&6
+if test "${ac_cv_header_krb5_h+set}" = set; then
+  echo $ECHO_N "(cached) $ECHO_C" >&6
+else
+  ac_cv_header_krb5_h=$ac_header_preproc
+fi
+echo "$as_me:$LINENO: result: $ac_cv_header_krb5_h" >&5
+echo "${ECHO_T}$ac_cv_header_krb5_h" >&6
+
+fi
+
+
+
 cat >confcache <<\_ACEOF
 # This file is a shell script that caches the results of configure
 # tests run on this system so they can be shared between configure
diff --git a/src/configure.ac b/src/configure.ac
index 1169fcbff..cabfa55e1 100644
--- a/src/configure.ac
+++ b/src/configure.ac
@@ -57,4 +57,20 @@ AC_CONFIG_FILES([Makefile
                  $make_ejabberd_zlib])
 #openssl
 AM_WITH_OPENSSL
+# If ssl is kerberized it need krb5.h
+# On RedHat and OpenBSD, krb5.h is in an unsual place:
+KRB5_INCLUDE="`krb5-config --cflags 2>/dev/null`"
+if test -n "$KRB5_INCLUDE" ; then
+        CPPFLAGS="$CPPFLAGS $KRB5_INCLUDE"
+else
+        #         For RedHat                                  For BSD
+        for D in /usr/kerberos/include /usr/include/kerberos /usr/include/kerberosV
+        do
+                if test -d $D ; then
+                        CPPFLAGS="$CPPFLAGS -I$D"
+                fi
+        done
+fi
+AC_CHECK_HEADER(krb5.h,,)
+
 AC_OUTPUT