diff --git a/common.gypi b/common.gypi
index c7c367ec83bfc6..d152c81498858f 100644
--- a/common.gypi
+++ b/common.gypi
@@ -291,7 +291,7 @@
         'cflags': [ '-pthread', ],
         'ldflags': [ '-pthread' ],
       }],
-      [ 'OS in "linux freebsd openbsd solaris android aix"', {
+      [ 'OS in "linux freebsd openbsd solaris android aix cloudabi"', {
         'cflags': [ '-Wall', '-Wextra', '-Wno-unused-parameter', ],
         'cflags_cc': [ '-fno-rtti', '-fno-exceptions', '-std=gnu++0x' ],
         'ldflags': [ '-rdynamic' ],
diff --git a/configure b/configure
index 9e04b03d4fe481..95f103fbcb34c2 100755
--- a/configure
+++ b/configure
@@ -57,7 +57,7 @@ from gyp_node import run_gyp
 parser = optparse.OptionParser()
 
 valid_os = ('win', 'mac', 'solaris', 'freebsd', 'openbsd', 'linux',
-            'android', 'aix')
+            'android', 'aix', 'cloudabi')
 valid_arch = ('arm', 'arm64', 'ia32', 'mips', 'mipsel', 'mips64el', 'ppc',
               'ppc64', 'x32','x64', 'x86', 's390', 's390x')
 valid_arm_float_abi = ('soft', 'softfp', 'hard')
diff --git a/src/cares_wrap.cc b/src/cares_wrap.cc
index 1abbbe629a6e0e..77426c4acd4c44 100644
--- a/src/cares_wrap.cc
+++ b/src/cares_wrap.cc
@@ -34,6 +34,10 @@
 #include <vector>
 #include <unordered_set>
 
+#ifdef __POSIX__
+# include <netdb.h>
+#endif  // __POSIX__
+
 #if defined(__ANDROID__) || \
     defined(__MINGW32__) || \
     defined(__OpenBSD__) || \
diff --git a/src/node.cc b/src/node.cc
index 33bf5199d63b01..bfe36f218adf4b 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -108,7 +108,7 @@ typedef int mode_t;
 #include <unistd.h>  // setuid, getuid
 #endif
 
-#if defined(__POSIX__) && !defined(__ANDROID__)
+#if defined(__POSIX__) && !defined(__ANDROID__) && !defined(__CloudABI__)
 #include <pwd.h>  // getpwnam()
 #include <grp.h>  // getgrnam()
 #endif
@@ -1002,7 +1002,7 @@ Local<Value> UVException(Isolate* isolate,
 
 // Look up environment variable unless running as setuid root.
 bool SafeGetenv(const char* key, std::string* text) {
-#ifndef _WIN32
+#if !defined(__CloudABI__) && !defined(_WIN32)
   if (linux_at_secure || getuid() != geteuid() || getgid() != getegid())
     goto fail;
 #endif
@@ -2122,7 +2122,7 @@ static void Umask(const FunctionCallbackInfo<Value>& args) {
 }
 
 
-#if defined(__POSIX__) && !defined(__ANDROID__)
+#if defined(__POSIX__) && !defined(__ANDROID__) && !defined(__CloudABI__)
 
 static const uid_t uid_not_found = static_cast<uid_t>(-1);
 static const gid_t gid_not_found = static_cast<gid_t>(-1);
@@ -2441,7 +2441,7 @@ static void InitGroups(const FunctionCallbackInfo<Value>& args) {
   }
 }
 
-#endif  // __POSIX__ && !defined(__ANDROID__)
+#endif  // __POSIX__ && !defined(__ANDROID__) && !defined(__CloudABI__)
 
 
 static void WaitForInspectorDisconnect(Environment* env) {
@@ -3706,7 +3706,7 @@ void SetupProcessObject(Environment* env,
 
   env->SetMethod(process, "umask", Umask);
 
-#if defined(__POSIX__) && !defined(__ANDROID__)
+#if defined(__POSIX__) && !defined(__ANDROID__) && !defined(__CloudABI__)
   env->SetMethod(process, "getuid", GetUid);
   env->SetMethod(process, "geteuid", GetEUid);
   env->SetMethod(process, "setuid", SetUid);
@@ -3720,7 +3720,7 @@ void SetupProcessObject(Environment* env,
   env->SetMethod(process, "getgroups", GetGroups);
   env->SetMethod(process, "setgroups", SetGroups);
   env->SetMethod(process, "initgroups", InitGroups);
-#endif  // __POSIX__ && !defined(__ANDROID__)
+#endif  // __POSIX__ && !defined(__ANDROID__) && !defined(__CloudABI__)
 
   env->SetMethod(process, "_kill", Kill);