diff --git a/fixup_nox11.sh b/fixup_nox11.sh
index 4096df1..9ee78fc 100755
--- a/fixup_nox11.sh
+++ b/fixup_nox11.sh
@@ -7,4 +7,5 @@
 
 HEADER="${MESON_INSTALL_DESTDIR_PREFIX:-/usr}/$1"
 
-sed -i 's/MESA_EGL_NO_X11_HEADERS/__unix__/g' "$HEADER"
+[ -f "$HEADER" ] && \
+	sed -i 's/MESA_EGL_NO_X11_HEADERS/__unix__/g' "$HEADER"
diff --git a/meson.build b/meson.build
index 8ac2ff8..3f3a6e1 100644
--- a/meson.build
+++ b/meson.build
@@ -288,7 +288,7 @@ if not wrappers
   meson.add_install_script('fixup_wrappers.sh', get_option('libdir'))
 endif
 
-if platform != 'x11'
+if platform != 'x11' and not vendor_package
 # Fixup EGL header
   meson.add_install_script('fixup_nox11.sh',
     get_option('includedir') / 'EGL' / 'eglplatform.h')