diff --git a/builder/build.sh b/builder/build.sh
index 9cee060..e2842eb 100755
--- a/builder/build.sh
+++ b/builder/build.sh
@@ -139,6 +139,8 @@ if [ -d /usr/lib/x86_64-linux-gnu/dri ]; then
   ln -s /usr/lib/x86_64-linux-gnu/dri dri
 elif [ -d /usr/lib/aarch64-linux-gnu/dri ]; then
   ln -s /usr/lib/aarch64-linux-gnu/dri dri
+elif [ -d /usr/lib/arm-linux-gnueabihf/dri ]; then
+  ln -s /usr/lib/arm-linux-gnueabihf/dri dri
 elif [ -d /usr/lib/xorg/modules/dri ]; then
   ln -s /usr/lib/xorg/modules/dri dri
 else
diff --git a/common/network/websocket.c b/common/network/websocket.c
index d4bc772..cdedda4 100644
--- a/common/network/websocket.c
+++ b/common/network/websocket.c
@@ -18,6 +18,7 @@
 #include <errno.h>
 #include <string.h>
 #include <dirent.h>
+#include <inttypes.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
@@ -939,15 +940,15 @@ static void servefile(ws_ctx_t *ws_ctx, const char *in, const char * const user,
         goto nope;
     }
 
-    fseek(f, 0, SEEK_END);
-    const uint64_t filesize = ftell(f);
+    fseeko(f, 0, SEEK_END);
+    const uint64_t filesize = ftello(f);
     rewind(f);
 
     sprintf(buf, "HTTP/1.1 200 OK\r\n"
                  "Server: KasmVNC/4.0\r\n"
                  "Connection: close\r\n"
                  "Content-type: %s\r\n"
-                 "Content-length: %lu\r\n"
+                 "Content-length: %" PRIu64 "\r\n"
                  "%s"
                  "\r\n",
                  name2mime(path), filesize, extra_headers ? extra_headers : "");