diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2c27167..0efb933 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,8 +9,8 @@ project(c-capnproto LANGUAGES ${languages})
 
 include(CTest)
 
-set(CMAKE_C_STANDARD 11)
-set(CMAKE_C_EXTENSIONS NO)
+# set(CMAKE_C_STANDARD 11)
+# set(CMAKE_C_EXTENSIONS NO)
 if(BUILD_TESTING)
     set(CMAKE_CXX_STANDARD 20)
     set(CMAKE_CXX_EXTENSIONS NO)
@@ -170,6 +170,7 @@ if(C_CAPNPROTO_ENABLE_INSTALL)
     install(FILES lib/capnp_c.h TYPE INCLUDE)
 endif()
 
+add_subdirectory(examples/book)
 if(BUILD_TESTING AND CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR)
     add_subdirectory(tests)
 endif()
diff --git a/compiler/capnpc-c.c b/compiler/capnpc-c.c
index 80de50a..af15071 100644
--- a/compiler/capnpc-c.c
+++ b/compiler/capnpc-c.c
@@ -2017,11 +2017,11 @@ static void define_struct(capnp_ctx_t *ctx, struct node *n, const char *extattr,
         &(ctx->SRC),
         "\nvoid encode_%s(struct capn_segment *cs,struct %s *d, %s *s) {\n",
         n->name.str, n->name.str, buf);
-    str_addf(&(ctx->SRC), "%s\n", s.encoder);
+    str_addf(&(ctx->SRC), "%s\n", s.encoder.str);
     str_addf(&(ctx->SRC), "}\n");
     str_addf(&(ctx->SRC), "\nvoid decode_%s(%s *d, struct %s *s) {\n",
              n->name.str, buf, n->name.str);
-    str_addf(&(ctx->SRC), "%s\n", s.decoder);
+    str_addf(&(ctx->SRC), "%s\n", s.decoder.str);
     str_addf(&(ctx->SRC), "}\n");
   }
 
diff --git a/examples/book/test.c b/examples/book/test.c
index d4c03c4..fd51655 100644
--- a/examples/book/test.c
+++ b/examples/book/test.c
@@ -6,7 +6,7 @@
 
 static void usage(char *app) {
     fprintf(stderr, "usage: %s encode | %s decode\n",
-	    app);
+	    app, app);
 }
 
 int encode() {