diff --git a/pkgs/by-name/na/nanotts/package.nix b/pkgs/by-name/na/nanotts/package.nix
index c1a246a67262..bb6422750d1d 100644
--- a/pkgs/by-name/na/nanotts/package.nix
+++ b/pkgs/by-name/na/nanotts/package.nix
@@ -35,6 +35,10 @@ stdenv.mkDerivation {
   ];
 
   patchPhase = ''
+    # fix 64-bit compilation error in picoapi.c: picoos_uint32 vs picoos_objsize_t
+    substituteInPlace svoxpico/picoapi.c \
+      --replace-fail 'picoos_uint32 rest_mem_size;' 'picoos_objsize_t rest_mem_size;'
+
     substituteInPlace "src/main.cpp" --replace "/usr/share/pico/lang" "$out/share/lang"
     echo "" > update_build_version.sh
   '';
@@ -46,6 +50,11 @@ stdenv.mkDerivation {
       --set ALSA_PLUGIN_DIR ${alsa-plugins}/lib/alsa-lib
   '';
 
+  postPatch = ''
+    substituteInPlace CMakeLists.txt \
+      --replace-fail "cmake_minimum_required(VERSION 3.3)" "cmake_minimum_required(VERSION 3.10)"
+  '';
+
   meta = {
     description = "Speech synthesizer commandline utility that improves pico2wave, included with SVOX PicoTTS";
     homepage = "https://github.com/gmn/nanotts";