diff --git a/src/buildall.bash b/src/buildall.bash
index e4e3ec37ec..4e9b15bf4b 100755
--- a/src/buildall.bash
+++ b/src/buildall.bash
@@ -36,7 +36,8 @@ fi
 GOROOT="$(cd .. && pwd)"
 
 gettargets() {
-	../bin/go tool dist list | sed -e 's|/|-|'
+	../bin/go tool dist list | sed -e 's|/|-|' |
+		egrep -v '^(android|ios)' # need C toolchain even for cross-compiling
 	echo linux-arm-arm5
 }
 
diff --git a/src/runtime/internal/wasitest/nonblock_test.go b/src/runtime/internal/wasitest/nonblock_test.go
index 887baab33f..d873ef55fb 100644
--- a/src/runtime/internal/wasitest/nonblock_test.go
+++ b/src/runtime/internal/wasitest/nonblock_test.go
@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// Not all systems have syscall.Mkfifo.
+//go:build !aix && !plan9 && !solaris && !wasm && !windows
+
 package wasi_test
 
 import (