* gc.h: fix various preprocessor usages of new public

symbols to expect 0 or 1 values rather than 1 or undefined.
i.e. change #ifdef to #if, etc.

diff --git a/libguile/gc.h b/libguile/gc.h
index 106da56..a2d7fc0 100644 (file)
--- a/libguile/gc.h
+++ b/libguile/gc.h
@@ -50,10 +50,10 @@
 
 #include "libguile/hooks.h"
 
-#ifdef SCM_USE_PTHREAD_THREADS
-#include "libguile/pthread-threads.h"
+#if SCM_USE_PTHREAD_THREADS
+# include "libguile/pthread-threads.h"
 #else
-#include "libguile/null-threads.h"
+# include "libguile/null-threads.h"
 #endif
 
 \f