time.c: Check if defined(RUBY_MSVCRT_VERSION) to build on Solaris

Fixes [Bug #17947]

1 files changed, 1 insertions, 1 deletions

diff --git a/time.c b/time.c
index a5c00e2aa2..a7ef9d2f47 100644
--- a/time.c
+++ b/time.c
@@ -1623,7 +1623,7 @@ localtime_with_gmtoff_zone(const time_t *t, struct tm *result, long *gmtoff, VAL
 #if defined(HAVE_TM_ZONE)
             *zone = zone_str(tm.tm_zone);
 #elif defined(HAVE_TZNAME) && defined(HAVE_DAYLIGHT)
-# if RUBY_MSVCRT_VERSION >= 140
+# if defined(RUBY_MSVCRT_VERSION) && RUBY_MSVCRT_VERSION >= 140
 #  define tzname _tzname
 #  define daylight _daylight
 # endif