diff --git a/pkgs/development/libraries/science/astronomy/indilib/indi-3rdparty.nix b/pkgs/development/libraries/science/astronomy/indilib/indi-3rdparty.nix
index c4faadd2a5eb..7144a17c18b4 100644
--- a/pkgs/development/libraries/science/astronomy/indilib/indi-3rdparty.nix
+++ b/pkgs/development/libraries/science/astronomy/indilib/indi-3rdparty.nix
@@ -48,6 +48,8 @@ stdenv.mkDerivation rec {
         --replace "/etc/udev/rules.d" "lib/udev/rules.d" \
         --replace "/lib/firmware" "lib/firmware"
     done
+
+    sed '1i#include <ctime>' -i indi-duino/libfirmata/src/firmata.cpp # gcc12
   '';
 
   cmakeFlags = [
diff --git a/pkgs/tools/filesystems/idsk/default.nix b/pkgs/tools/filesystems/idsk/default.nix
index d3c82479d100..34a32c4a6dfe 100644
--- a/pkgs/tools/filesystems/idsk/default.nix
+++ b/pkgs/tools/filesystems/idsk/default.nix
@@ -14,8 +14,8 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
-  NIX_CFLAGS_COMPILE = [
-    # Needed with GCC 12
+  NIX_CFLAGS_COMPILE = lib.optionals stdenv.cc.isGNU [
+    # Needed with GCC 12 but breaks on darwin (with clang)
     "-std=c++14"
   ];