diff --git a/eval.c b/eval.c
index 9c0c559f..472c8179 100644
--- a/eval.c
+++ b/eval.c
@@ -1221,10 +1221,10 @@ sexp sexp_get_port_fileno (sexp ctx, sexp self, sexp_sint_t n, sexp port) {
 #endif
 
 #if SEXP_USE_STATIC_LIBS
-#ifndef PLAN9
-#include "clibs.c"
-#else
+#if SEXP_USE_STATIC_LIBS_NO_INCLUDE
 struct sexp_library_entry_t sexp_static_libraries[];
+#else
+#include "clibs.c"
 #endif
 static struct sexp_library_entry_t *sexp_find_static_library(const char *file)
 {
diff --git a/include/chibi/features.h b/include/chibi/features.h
index 02f66314..9103df2a 100644
--- a/include/chibi/features.h
+++ b/include/chibi/features.h
@@ -336,6 +336,11 @@
 #define SEXP_USE_STATIC_LIBS 0
 #endif
 
+/* don't include clibs.c - include separately or link */
+#ifndef SEXP_USE_STATIC_LIBS_NO_INCLUDE
+#define SEXP_USE_STATIC_LIBS_NO_INCLUDE defined(PLAN9)
+#endif
+
 #ifndef SEXP_USE_FULL_SOURCE_INFO
 #define SEXP_USE_FULL_SOURCE_INFO ! SEXP_USE_NO_FEATURES
 #endif