backend: Add missing #ifdef for zlib

Add #ifdef statement since zlib is optional. At the moment an empty
version string is used when zlib is not available:

backend: Libs: glib 2.72.4 (rt: 2.72.4/7204:4), zlib , libzip 1.7.3,

Signed-off-by: Marc Schink <redacted>

diff --git a/src/backend.c b/src/backend.c
index 82ad42f7ee6b7b2e442a78a7af93c06433dd4c3f..db21294abc3e1fc1610f7cbef41f2f9f81e8ab88 100644 (file)
--- a/src/backend.c
+++ b/src/backend.c
@@ -137,9 +137,11 @@ SR_API GSList *sr_buildinfo_libs_get(void)
                glib_binary_age, glib_interface_age));
        l = g_slist_append(l, m);
 
+#ifdef HAVE_ZLIB
        m = g_slist_append(NULL, g_strdup("zlib"));
        m = g_slist_append(m, g_strdup_printf("%s", CONF_ZLIB_VERSION));
        l = g_slist_append(l, m);
+#endif
 
        m = g_slist_append(NULL, g_strdup("libzip"));
        m = g_slist_append(m, g_strdup_printf("%s", CONF_LIBZIP_VERSION));