<p><b>@bergzand</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11085#discussion_r326060085">sys/usb/usbus/cdc/acm/cdc_acm_stdio.c</a>:</p>
<pre style='color:#555'>> +
+static usbus_cdcacm_device_t cdcacm;
+static uint8_t _cdc_tx_buf_mem[STDIO_UART_RX_BUFSIZE * 4];
+static uint8_t _cdc_rx_buf_mem[STDIO_UART_RX_BUFSIZE];
+isrpipe_t cdc_stdio_isrpipe = ISRPIPE_INIT(_cdc_rx_buf_mem);
+
+#if MODULE_VFS
+static ssize_t uart_stdio_vfs_read(vfs_file_t *filp, void *dest, size_t nbytes);
+static ssize_t uart_stdio_vfs_write(vfs_file_t *filp, const void *src, size_t nbytes);
+
+/**
+ * @brief VFS file operation table for stdin/stdout/stderr
+ */
+static vfs_file_ops_t uart_stdio_vfs_ops = {
+    .read = stdio_vfs_read,
+    .write = stdio_vfs_write,
</pre>
<p>And removed, should compile now.</p>

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