Use the system getenv in setup_debug_log

As ruby_set_debug_option() is called before ruby_sysinit(),
CRITICAL_SECTIONs are not initialized yet.

1 files changed, 1 insertions, 0 deletions

diff --git a/debug.c b/debug.c
index 75d4cc6569..e0ff94886b 100644
--- a/debug.c
+++ b/debug.c
@@ -263,6 +263,7 @@ ruby_set_debug_option(const char *str)
 }
 
 #if RUBY_DEVEL
+#undef getenv
 
 // RUBY_DEBUG_LOG features
 // See vm_debug.h comments for details.