diff --git a/librepomgr/buildactions/buildactionmeta.cpp b/librepomgr/buildactions/buildactionmeta.cpp
index a975a4a..c70fc0d 100644
--- a/librepomgr/buildactions/buildactionmeta.cpp
+++ b/librepomgr/buildactions/buildactionmeta.cpp
@@ -197,6 +197,12 @@ BuildActionMetaInfo::BuildActionMetaInfo()
                     .desc = "Uses `makecontainerpkg` instead of using `makepkg` when printing source info; eliminates the need to having pacman on the host by using docker/podman instead",
                     .param = "use-container",
                 },
+                BuildActionFlagMetaInfo{
+                    .id = static_cast<BuildActionFlagType>(PrepareBuildFlags::AurOnly),
+                    .name = "AUR-only",
+                    .desc = "Consider it an error when a PKGBUILD was found locally and thus was not downloaded from the AUR",
+                    .param = "aur-only",
+                },
             },
             .settings = {
                 BuildActionSettingMetaInfo{
diff --git a/librepomgr/buildactions/buildactionmeta.h b/librepomgr/buildactions/buildactionmeta.h
index 0e5ef34..77b4542 100644
--- a/librepomgr/buildactions/buildactionmeta.h
+++ b/librepomgr/buildactions/buildactionmeta.h
@@ -88,6 +88,7 @@ enum class PrepareBuildFlags : BuildActionFlagType {
     PullingInFurtherDependenciesUnexpected = (1 << 5),
     FetchOfficialPackageSources = (1 << 6),
     UseContainer = (1 << 7),
+    AurOnly = (1 << 8),
 };
 enum class ConductBuildFlags : BuildActionFlagType {
     None,
diff --git a/librepomgr/buildactions/buildactionprivate.h b/librepomgr/buildactions/buildactionprivate.h
index 163e1ef..54cd1c0 100644
--- a/librepomgr/buildactions/buildactionprivate.h
+++ b/librepomgr/buildactions/buildactionprivate.h
@@ -520,6 +520,7 @@ private:
     bool m_pulledInFurtherDependencies = false;
     bool m_fetchOfficialSources = false;
     bool m_useContainer = false;
+    bool m_aurOnly = false;
 };
 
 struct LIBREPOMGR_EXPORT BatchProcessingSession : public MultiSession<std::string> {
diff --git a/librepomgr/buildactions/preparebuild.cpp b/librepomgr/buildactions/preparebuild.cpp
index 7d2f5d9..a183de9 100644
--- a/librepomgr/buildactions/preparebuild.cpp
+++ b/librepomgr/buildactions/preparebuild.cpp
@@ -78,6 +78,7 @@ void PrepareBuild::run()
     m_pullingInFurtherDependenciesUnexpected = flags & PrepareBuildFlags::PullingInFurtherDependenciesUnexpected;
     m_fetchOfficialSources = flags & PrepareBuildFlags::FetchOfficialPackageSources;
     m_useContainer = flags & PrepareBuildFlags::UseContainer;
+    m_aurOnly = flags & PrepareBuildFlags::AurOnly;
     if (m_forceBumpPackageVersion && m_keepPkgRelAndEpoch) {
         reportError("Can not force-bump pkgrel and keeping it at the same time.");
         return;
@@ -890,14 +891,22 @@ void PrepareBuild::computeDependencies(WebClient::AurSnapshotQuerySession::Conta
     }
 
     // check for errors
-    set<string> failedPackages;
+    auto failedPackages = std::set<std::string>();
+    auto localPackages = std::set<std::string>();
+    auto errorMessage = std::string();
     for (const auto &buildData : m_buildDataByPackage) {
         if (!buildData.second.error.empty()) {
             failedPackages.emplace(buildData.first);
+        } else if (m_aurOnly && !buildData.second.originalSourceDirectory.empty()) {
+            localPackages.emplace(buildData.first);
         }
     }
     if (!failedPackages.empty()) {
-        auto errorMessage = "Unable to retrieve the following packages (see result data for details): " + joinStrings(failedPackages, " ");
+        errorMessage = "Unable to retrieve the following packages (see result data for details): " + joinStrings(failedPackages, " ");
+    } else if (!localPackages.empty()) {
+        errorMessage = "The following packages have a local override but the AUR-only flag was set: " + joinStrings(localPackages, " ");
+    }
+    if (!errorMessage.empty()) {
         m_buildAction->appendOutput(Phrases::ErrorMessage, errorMessage, '\n');
         auto resultData = makeResultData(std::move(errorMessage));
         auto buildActionWriteLock = m_setup.building.lockToWrite();