install: detect /etc/apache2/conf-available on debian with apache2.4

refs #4508

Makefile.in

@@ -206,10 +206,16 @@ install-javascript:
 	ln -sf $(DESTDIR)$(prefix)/lib/ext3 $(DESTDIR)$(prefix)/pub/js/ext3
 
 install-apache-config:
+	$(INSTALL) -m 755 -d $(INSTALL_OPTS) $(DESTDIR)$(WEB_APACHE_PATH)
 	${INSTALL} -b -m 664 $(INSTALL_OPTS) etc/apache2/icinga-web.conf $(DESTDIR)$(WEB_APACHE_PATH)/icinga-web.conf
 	@printf "\nInstalled configuration in '%s'.\n" "$(WEB_APACHE_PATH)"
 	@printf "Please make sure that the directory is included or \n"
 	@printf "include %s/icinga-web.conf manually.\n" "$(WEB_APACHE_PATH)"
+
+	@if [ "$(WEB_APACHE_PATH)" = "/etc/apache2/conf-available" ]; then \
+		printf "Enable the configuration using 'a2enconf icinga-web'.\n"; \
+	fi
+
 	@printf "\nPlease restart your apache in order to complete this step.\n\n"
 
 install-lib:

configure

@@ -2330,7 +2330,7 @@ if test "${with_web_apache_path+set}" = set; then :
 else
   web_apache_path=
     web_apache_path=/etc/apache2/conf.d
-    for x in /etc/httpd/conf.d /etc/apache2/conf.d /etc/apache/conf.d; do
+    for x in /etc/httpd/conf.d /etc/apache2/conf-available /etc/apache2/conf.d /etc/apache/conf.d; do
         { $as_echo "$as_me:${as_lineno-$LINENO}: checking if path $x exists" >&5
 $as_echo_n "checking if path $x exists... " >&6; }
         if test -d $x; then :

configure.ac

@@ -94,7 +94,7 @@ AC_ARG_WITH([web_absolute_path],
 AC_ARG_WITH([web_apache_path],
     AS_HELP_STRING([--with-web-apache-path=PATH], [Include folder apache2 (default /etc/apache2/conf.d]),
     web_apache_path=$withval,
-    web_apache_path=ACICINGA_PATH_GUESS([/etc/httpd/conf.d /etc/apache2/conf.d /etc/apache/conf.d], [web_apache_path], [/etc/apache2/conf.d])
+    web_apache_path=ACICINGA_PATH_GUESS([/etc/httpd/conf.d /etc/apache2/conf-available /etc/apache2/conf.d /etc/apache/conf.d], [web_apache_path], [/etc/apache2/conf.d])
 )
 
 AC_ARG_WITH([clearcache_path],