Merge pull request #233 from berkerpeksag/mremap Define _GNU_SOURCE on Linux for mremap()
diff --git a/src/dlmalloc.c b/src/dlmalloc.c
index 7e4ea83..d63dd36 100644
--- a/src/dlmalloc.c
+++ b/src/dlmalloc.c
@@ -438,6 +438,11 @@ DEFAULT_MMAP_THRESHOLD default: 256K
*/
+#if defined __linux__ && !defined _GNU_SOURCE
+/* mremap() on Linux requires this via sys/mman.h */
+#define _GNU_SOURCE 1
+#endif
+
#ifndef WIN32
#ifdef _WIN32
#define WIN32 1