diff --git a/glfw/glfw.py b/glfw/glfw.py
index a498bbb38..5794f6ca5 100755
--- a/glfw/glfw.py
+++ b/glfw/glfw.py
@@ -22,7 +22,7 @@ def wayland_protocol_file_name(base, ext='c'):
     return 'wayland-{}-client-protocol.{}'.format(base, ext)
 
 
-def init_env(env, pkg_config, at_least_version, module='x11'):
+def init_env(env, pkg_config, at_least_version, test_compile, module='x11'):
     ans = env.copy()
     ans.cflags = [
         x for x in ans.cflags
@@ -76,6 +76,14 @@ def init_env(env, pkg_config, at_least_version, module='x11'):
         for dep in 'wayland-egl wayland-client wayland-cursor xkbcommon dbus-1'.split():
             ans.cflags.extend(pkg_config(dep, '--cflags-only-I'))
             ans.ldpaths.extend(pkg_config(dep, '--libs'))
+        has_memfd_create = test_compile(env.cc, '-Werror', src='''#define _GNU_SOURCE
+    #include <unistd.h>
+    #include <sys/syscall.h>
+    int main(void) {
+        return syscall(__NR_memfd_create, "test", 0);
+    }''')
+        if has_memfd_create:
+            ans.cppflags.append('-DHAS_MEMFD_CREATE')
 
     return ans
 
diff --git a/setup.py b/setup.py
index 982a3b8b5..738873eb4 100755
--- a/setup.py
+++ b/setup.py
@@ -169,12 +169,6 @@ def init_env(
     cc, ccver = cc_version()
     print('CC:', cc, ccver)
     stack_protector = first_successful_compile(cc, '-fstack-protector-strong', '-fstack-protector')
-    has_memfd_create = test_compile(cc, '-Werror', src='''#define _GNU_SOURCE
-#include <unistd.h>
-#include <sys/syscall.h>
-int main(void) {
-    return syscall(__NR_memfd_create, "test", 0);
-}''')
     missing_braces = ''
     if ccver < (5, 2) and cc == 'gcc':
         missing_braces = '-Wno-missing-braces'
@@ -224,8 +218,6 @@ int main(void) {
         cflags.append('-g3')
         ldflags.append('-lprofiler')
     ldpaths = []
-    if has_memfd_create:
-        cppflags.append('-DHAS_MEMFD_CREATE')
     return Env(cc, cppflags, cflags, ldflags, ldpaths=ldpaths)
 
 
@@ -429,7 +421,7 @@ def compile_glfw(incremental, compilation_database, all_keys):
     modules = 'cocoa' if is_macos else 'x11 wayland'
     for module in modules.split():
         try:
-            genv = glfw.init_env(env, pkg_config, at_least_version, module)
+            genv = glfw.init_env(env, pkg_config, at_least_version, test_compile, module)
         except SystemExit as err:
             if module != 'wayland':
                 raise