Adding support for msys.
diff --git a/src/core/lib/support/log_linux.c b/src/core/lib/support/log_linux.c
index ff3febb..ca04c02 100644
--- a/src/core/lib/support/log_linux.c
+++ b/src/core/lib/support/log_linux.c
@@ -41,7 +41,7 @@
 
 #include <grpc/support/port_platform.h>
 
-#ifdef GPR_LINUX
+#ifdef GPR_LINUX_LOG
 
 #include <grpc/support/alloc.h>
 #include <grpc/support/log.h>
@@ -103,4 +103,4 @@
   gpr_free(prefix);
 }
 
-#endif
+#endif /* GPR_LINUX_LOG */