build: use AC_ARG_WITH for zlib

Since it selects an external dependency for inclusion, AC_ARG_WITH
is preferred (autoconf.info 15.2 "Working with external software").

diff --git a/configure.ac b/configure.ac
index 21a63b7..46b535d 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -51,10 +51,10 @@ AS_IF([test "x$enable_logging" = "xyes"], [
        AC_DEFINE(ENABLE_LOGGING, [1], [System logging.])
 ])
 
-AC_ARG_ENABLE([zlib],
-       AS_HELP_STRING([--enable-zlib], [handle gzipped modules @<:@default=disabled@:>@]),
-       [], enable_zlib=no)
-AS_IF([test "x$enable_zlib" != "xno"], [
+AC_ARG_WITH([zlib],
+       AS_HELP_STRING([--with-zlib], [handle gzipped modules @<:@default=disabled@:>@]),
+       [], [with_zlib=no])
+AS_IF([test "x$with_zlib" != "xno"], [
        PKG_CHECK_MODULES([zlib], [zlib])
        AC_DEFINE([ENABLE_ZLIB], [1], [Enable zlib for modules.])
 ], [
@@ -139,6 +139,6 @@ AC_MSG_RESULT([
 
        tools:                  ${enable_tools}
        logging:                ${enable_logging}
-        zlib:                   ${enable_zlib}
+       zlib:                   ${with_zlib}
        debug:                  ${enable_debug}
 ])