build-sys: fix help text of bzip2 configure check

The bzip2 support is enabled by default unless requested otherwise via
--disable-bzip2. Make the help text reflect that.

Fixes: #4636

diff --git a/configure.ac b/configure.ac
index 6423204178ab7f11638bdafe0b2e267ecb65c772..72b291ed0f1a1340abac05e574c2798c0fc15e06 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -606,7 +606,7 @@ AM_CONDITIONAL(HAVE_ZLIB, [test "$have_zlib" = "yes"])
 
 # ------------------------------------------------------------------------------
 have_bzip2=no
-AC_ARG_ENABLE(bzip2, AS_HELP_STRING([--enable-bzip2], [Enable optional BZIP2 support]))
+AC_ARG_ENABLE(bzip2, AS_HELP_STRING([--disable-bzip2], [disable optional BZIP2 support]))
 AS_IF([test "x$enable_bzip2" != "xno"], [
         AC_CHECK_HEADERS(bzlib.h,
                 [AC_DEFINE(HAVE_BZIP2, 1, [Define if BZIP2 is available])