diff --git a/boehm-gc/ChangeLog b/boehm-gc/ChangeLog
index 425b015952a..81bf9f6112f 100644
--- a/boehm-gc/ChangeLog
+++ b/boehm-gc/ChangeLog
@@ -1,3 +1,7 @@
+2006-02-09  Tom Tromey  <tromey@redhat.com>
+
+	* pthread_support.c: Conditionally include dlfcn.h.
+
 2006-02-06  Jakub Jelinek  <jakub@redhat.com>
 	    Anthony Green  <green@redhat.com>
 	    Tom Tromey  <tromey@redhat.com>
diff --git a/boehm-gc/pthread_support.c b/boehm-gc/pthread_support.c
index 7c7bb0519b2..55872ef65c8 100644
--- a/boehm-gc/pthread_support.c
+++ b/boehm-gc/pthread_support.c
@@ -47,8 +47,12 @@
 /*#define DEBUG_THREADS 1*/
 /*#define GC_ASSERTIONS*/
 
+#include "gc_config.h"
+
+#ifdef GC_PTHREAD_SYM_VERSION
 #define _GNU_SOURCE
 #include <dlfcn.h>
+#endif
 
 # include "gc.h"
 # include "private/pthread_support.h"