diff -rupN --no-dereference qt-creator-opensource-src-4.12.4/src/plugins/cmakeprojectmanager/cmakekitinformation.cpp qt-creator-opensource-src-4.12.4-new/src/plugins/cmakeprojectmanager/cmakekitinformation.cpp
--- qt-creator-opensource-src-4.12.4/src/plugins/cmakeprojectmanager/cmakekitinformation.cpp	2020-07-07 10:05:22.000000000 +0200
+++ qt-creator-opensource-src-4.12.4-new/src/plugins/cmakeprojectmanager/cmakekitinformation.cpp	2020-07-08 20:05:01.567131485 +0200
@@ -622,7 +622,7 @@ QVariant CMakeGeneratorKitAspect::defaul
             if (settings->ninjaPath().isEmpty()) {
                 Utils::Environment env = Utils::Environment::systemEnvironment();
                 k->addToEnvironment(env);
-                return !env.searchInPath("ninja").isEmpty();
+                return !env.searchInPath("ninja-build").isEmpty();
             }
             return true;
         }();