Perl 5.10 is required

configure

@@ -3964,6 +3964,9 @@ if test "$ac_have_clock_monotonic" = "yes" ; then
 
 printf "%s\n" "#define HAVE_CLOCK_MONOTONIC /**/" >>confdefs.h
 
+else
+   OLDLIBS="$LIBS"
+   LIBS="$LIBS -lrt"
 fi
 
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking whether fPIC compiler option is accepted" >&5
@@ -3993,6 +3996,23 @@ printf "%s\n" "no" >&6; }
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.beam conftest.$ac_ext
 
+if test -z "$PERL" ; then
+   as_fn_error $? "*** Cannot continue without Perl.  Sorry." "$LINENO" 5
+   exit 1
+fi
+
+if test -f "${PERL}" ; then
+    perl_version=`${PERL} -e "print $]"`
+    long_perl_version=`${PERL} -e "print ($] * 1000000)"`
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking Perl version" >&5
+printf %s "checking Perl version... " >&6; }
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: ${perl_version}" >&5
+printf "%s\n" "${perl_version}" >&6; }
+    if test ${long_perl_version} -lt 5010000 ; then
+      as_fn_error $? "At least Perl 5.10 is required" "$LINENO" 5
+    fi
+fi
+
 for thing in prefix siteprefix vendorprefix vendorlib installarchlib installprivlib installbin installman1dir installman3dir installscript installsitearch installsitelib; do
     { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for Perl installation variable $thing" >&5
 printf %s "checking for Perl installation variable $thing... " >&6; }
@@ -4105,11 +4125,6 @@ printf "%s\n" "#define HAVE_WAIT3 1" >>confdefs.h
 fi
 
 
-if test -z "$PERL" ; then
-   as_fn_error $? "*** Cannot continue without Perl.  Sorry." "$LINENO" 5
-   exit 1
-fi
-
 # Extract the first word of "nm", so it can be a program name with args.
 set dummy nm; ac_word=$2
 { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
@@ -4622,11 +4637,6 @@ else
    PTHREAD_FLAG=""
 fi
 
-if test "$GCC" = yes ; then
-   OLDLIBS="$LIBS"
-   LIBS="-lrt $LIBS"
-fi
-
 if test "$HAVE_EXTUTILS_EMBED" = "yes" ; then
    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking if we can embed a Perl interpreter in C" >&5
 printf %s "checking if we can embed a Perl interpreter in C... " >&6; }

configure.ac

@@ -58,6 +58,21 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <stdio.h>]], [[return 0;]])],
     [AC_MSG_RESULT(no)
      CFLAGS="$OLD_CFLAGS"])
 
+if test -z "$PERL" ; then
+   AC_MSG_ERROR([*** Cannot continue without Perl.  Sorry.])
+   exit 1
+fi
+
+if test -f "${PERL}" ; then
+    perl_version=`${PERL} -e "print $]"`
+    long_perl_version=`${PERL} -e "print ($] * 1000000)"`
+    AC_MSG_CHECKING([Perl version])
+    AC_MSG_RESULT(${perl_version})
+    if test ${long_perl_version} -lt 5010000 ; then
+      AC_MSG_ERROR([At least Perl 5.10 is required])
+    fi
+fi
+
 for thing in prefix siteprefix vendorprefix vendorlib installarchlib installprivlib installbin installman1dir installman3dir installscript installsitearch installsitelib; do
     AC_MSG_CHECKING([for Perl installation variable $thing])
     val=`$PERL -V:$thing | sed -e "s/^.*='//" -e "s/';$//"`
@@ -77,11 +92,6 @@ fi
 
 AC_FUNC_WAIT3
 
-if test -z "$PERL" ; then
-   AC_MSG_ERROR([*** Cannot continue without Perl.  Sorry.])
-   exit 1
-fi
-
 AC_PATH_PROG(NM, nm)
 
 dnl Allow user to tell us where Sendmail is (or will be)