added autoconfig for the ABC-Extension

get the information form KERNELDIR/include/linux/autoconf.h

isdnctrl/configure

@@ -1149,6 +1149,31 @@ EOF
 		
 	fi
 
+	OLD_CPPFLAGS="$CPPFLAGS"
+	CPPFLAGS="-nostdinc -I${CONFIG_KERNELDIR}/include"
+	have_abcext="no"
+	echo $ac_n "checking for ABC-Extension in ${CONFIG_KERNELDIR}/include/linux/autoconf.h""... $ac_c" 1>&6
+	cat > conftest.$ac_ext <<EOF
+#line 1648 "configure"
+#include "confdefs.h"
+#include <linux/autoconf.h>
+int main() { return 0; }
+int t() { int x = CONFIG_ISDN_WITH_ABC;
+; return 0; }
+EOF
+if eval $ac_compile; then
+  rm -rf conftest*
+  have_abcext="yes"
+fi
+rm -f conftest*
+
+	echo "$ac_t"""${have_abcext}"" 1>&6
+	CPPFLAGS="$OLD_CPPFLAGS"
+	if test "$have_abcext" != "no" ; then
+		cat >> confdefs.h <<\EOF
+#define HAVE_ABCEXT 1
+EOF
+	fi
 
 
 echo $ac_n "checking for -ldbm""... $ac_c" 1>&6
@@ -1443,6 +1468,7 @@ s%@CONFIG_KERNELDIR@%$CONFIG_KERNELDIR%g
 s%@HAVE_TRIGGERCPS@%$HAVE_TRIGGERCPS%g
 s%@HAVE_CISCOKEEPALIVE@%$HAVE_CISCOKEEPALIVE%g
 s%@HAVE_TIMRU@%$HAVE_TIMRU%g
+s%@HAVE_ABCEXT@%$HAVE_ABCEXT%g
 s%@INSTALL@%$INSTALL%g
 s%@DBMLIB@%$DBMLIB%g
 s%@MANDATE@%$MANDATE%g

isdnctrl/configure.in

@@ -10,6 +10,7 @@ CONFIG_SBINDIR=${CONFIG_SBINDIR:-"/sbin"}
 CONFIG_MANDIR=${CONFIG_MANDIR:-"/usr/man"}
 CONFIG_ISDNCTRL_CONF=${CONFIG_ISDNCTRL_CONF:-"n"}
 CONFIG_ISDNCTRL_TIMRU=${CONFIG_ISDNCTRL_TIMRU:-"n"}
+CONFIG_ISDN_WITH_ABC=${CONFIG_ISDN_WITH_ABC:-"n"}
 MANDATE=`grep CHECKIN isdnctrl.man.in | awk '{print $4}'`
 
 dnl Checks for programs.