Here is a patch to allow proper linking of rpl_lstat in C++ programs.
diff --git a/lib/sys_stat.in.h b/lib/sys_stat.in.h
index 234b527..50fb524 100644
--- a/lib/sys_stat.in.h
+++ b/lib/sys_stat.in.h
@@ -41,6 +41,10 @@
#ifndef _GL_SYS_STAT_H
#define _GL_SYS_STAT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
/* The definition of GL_LINK_WARNING is copied here. */
/* Before doing "#define mkdir rpl_mkdir" below, we need to include all
@@ -341,6 +345,10 @@ extern int lchmod (const char *filename, mode_t mode);
lchmod (f, m))
#endif
+#ifdef __cplusplus
+}
+#endif
+
#endif /* _GL_SYS_STAT_H */
#endif /* _GL_SYS_STAT_H */
#endif
