openexr: increase test timeout

The test can easily time out on slower machines.
Tested on a pine64 star64.

pkgs/development/libraries/openexr/default.nix

@@ -41,11 +41,13 @@ stdenv.mkDerivation rec {
     ./gcc-13.patch
   ];
 
-  # tests are determined to use /var/tmp on unix
   postPatch = ''
+    # tests are determined to use /var/tmp on unix
     find . -name tmpDir.h | while read -r f ; do
       substituteInPlace $f --replace '/var/tmp' "$TMPDIR"
     done
+    # On slower machines this test can take more than the default 1500 seconds
+    echo 'set_tests_properties(OpenEXR.IlmImf PROPERTIES TIMEOUT 3000)' >> OpenEXR/IlmImfTest/CMakeLists.txt
   '';
 
   cmakeFlags = [