unsetenv: Avoid gcc warning.

[gnulib.git] / lib / unsetenv.c

diff --git a/lib/unsetenv.c b/lib/unsetenv.c
index 215bba0..16b50d1 100644 (file)
--- a/lib/unsetenv.c
+++ b/lib/unsetenv.c
@@ -97,6 +97,13 @@ weak_alias (__unsetenv, unsetenv)
 #else /* HAVE_UNSETENV */
 
 # undef unsetenv
+# if !HAVE_DECL_UNSETENV
+#  if VOID_UNSETENV
+extern void unsetenv (const char *);
+#  else
+extern int unsetenv (const char *);
+#  endif
+# endif
 
 /* Call the underlying unsetenv, in case there is hidden bookkeeping
    that needs updating beyond just modifying environ.  */