build-sys: use AS_IF
diff --git a/configure.ac b/configure.ac
index 4137f0f..d17d611 100644
--- a/configure.ac
+++ b/configure.ac
@@ -53,23 +53,21 @@
])
AC_ARG_ENABLE([zlib],
- AS_HELP_STRING([--enable-zlib], [handle gzipped modules @<:@default=disabled@:>@]),
+ AS_HELP_STRING([--enable-zlib], [handle gzipped modules @<:@default=disabled@:>@]),
[], enable_zlib=no)
-if test "x$enable_zlib" != "xno"; then
- AC_CHECK_LIB([z], [gzopen],
- [
- zlib_libs="-lz"
- required_private_libs="${required_private_libs} ${zlib_libs}"
- ],
- [AC_MSG_ERROR([zlib is not present])])
-else
- AC_MSG_NOTICE([zlib support not requested])
- zlib_libs=""
-fi
-if test "x$zlib_libs" != "x"; then
- AC_DEFINE(ENABLE_ZLIB, [1], [Enable zlib for modules.])
-fi
-AC_SUBST(zlib_libs)
+AS_IF([test "x$enable_zlib" != "xno"], [
+ AC_CHECK_LIB([z], [gzopen], [
+ zlib_libs="-lz"
+ required_private_libs="${required_private_libs} ${zlib_libs}"
+ AC_DEFINE(ENABLE_ZLIB, [1], [Enable zlib for modules.])
+ AC_SUBST(zlib_libs)
+ ],
+ [AC_MSG_ERROR([zlib is not present])
+ ])
+], [
+ AC_MSG_NOTICE([zlib support not requested])
+ zlib_libs=""
+])
AC_ARG_ENABLE([debug],
AS_HELP_STRING([--enable-debug], [enable debug messages @<:@default=disabled@:>@]),
