diff --git a/lib/roken/roken.h.in b/lib/roken/roken.h.in
index 94c958024..643aae78d 100644
--- a/lib/roken/roken.h.in
+++ b/lib/roken/roken.h.in
@@ -312,7 +312,7 @@ const char * ROKEN_LIB_FUNCTION hstrerror(int);
 #endif
 #endif
 
-#if HAVE_DECL_H_ERRNO
+#if !HAVE_DECL_H_ERRNO
 extern int h_errno;
 #endif
 
@@ -509,13 +509,13 @@ int ROKEN_LIB_FUNCTION get_window_size(int fd, struct winsize *);
 void ROKEN_LIB_FUNCTION vsyslog(int, const char *, va_list);
 #endif
 
-#if HAVE_DECL_OPTARG
+#if !HAVE_DECL_OPTARG
 extern char *optarg;
 #endif
-#if HAVE_DECL_OPTIND
+#if !HAVE_DECL_OPTIND
 extern int optind;
 #endif
-#if HAVE_DECL_OPTERR
+#if !HAVE_DECL_OPTERR
 extern int opterr;
 #endif