diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index dc6e8a72..fbecb27a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -61,3 +61,42 @@ jobs:
         run: |
           cmake -GNinja -B build -DCRASH_REPORTER=OFF
           cmake --build build
+
+  freebsd:
+    name: FreeBSD
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build in FreeBSD VM
+        uses: vmactions/freebsd-vm@v1
+        with:
+          release: "15.0"
+          usesh: true
+
+          prepare: |
+            pkg update -f && pkg install -y \
+              cmake \
+              pkgconf \
+              cli11 \
+              spirv-tools \
+              qt6-base \
+              qt6-declarative \
+              qt6-shadertools \
+              qt6-wayland \
+              wayland \
+              wayland-protocols \
+              libdrm \
+              libxcb \
+              pipewire \
+              polkit \
+              glib \
+              mesa-libs \
+              git \
+              bash \
+              ninja \
+              gitup
+
+          run: |
+            cmake -GNinja -B build -DCRASH_REPORTER=OFF -DUSE_JEMALLOC=OFF -DCMAKE_C_FLAGS="-I/usr/local/include -L/usr/local/lib" -DCMAKE_CXX_FLAGS="-I/usr/local/include -L/usr/local/lib"
+            cmake --build build
\ No newline at end of file
diff --git a/src/core/logging.cpp b/src/core/logging.cpp
index 5c809f68..10ea453a 100644
--- a/src/core/logging.cpp
+++ b/src/core/logging.cpp
@@ -27,7 +27,7 @@
 #include <qtmetamacros.h>
 #include <qtypes.h>
 #include <sys/mman.h>
-#include <sys/sendfile.h>
+#include <unistd.h>
 
 #include "instanceinfo.hpp"
 #include "logcat.hpp"
@@ -392,7 +392,7 @@ void ThreadLogging::initFs() {
 		delete detailedFile;
 		detailedFile = nullptr;
 	} else {
-		auto lock = flock {
+		struct flock lock = {
 		    .l_type = F_WRLCK,
 		    .l_whence = SEEK_SET,
 		    .l_start = 0,
@@ -414,7 +414,7 @@ void ThreadLogging::initFs() {
 		auto* oldFile = this->file;
 		if (oldFile) {
 			oldFile->seek(0);
-			sendfile(file->handle(), oldFile->handle(), nullptr, oldFile->size());
+			copy_file_range(oldFile->handle(), nullptr, file->handle(), nullptr, oldFile->size(), 0);
 		}
 
 		this->file = file;
@@ -426,7 +426,14 @@ void ThreadLogging::initFs() {
 		auto* oldFile = this->detailedFile;
 		if (oldFile) {
 			oldFile->seek(0);
-			sendfile(detailedFile->handle(), oldFile->handle(), nullptr, oldFile->size());
+			copy_file_range(
+			    oldFile->handle(),
+			    nullptr,
+			    detailedFile->handle(),
+			    nullptr,
+			    oldFile->size(),
+			    0
+			);
 		}
 
 		crash::CrashInfo::INSTANCE.logFd = detailedFile->handle();
@@ -889,7 +896,7 @@ bool LogReader::continueReading() {
 }
 
 void LogFollower::FcntlWaitThread::run() {
-	auto lock = flock {
+	struct flock lock = {
 	    .l_type = F_RDLCK, // won't block other read locks when we take it
 	    .l_whence = SEEK_SET,
 	    .l_start = 0,
diff --git a/src/core/paths.cpp b/src/core/paths.cpp
index 55beb87c..6555e54e 100644
--- a/src/core/paths.cpp
+++ b/src/core/paths.cpp
@@ -361,7 +361,7 @@ void QsPaths::createLock() {
 			return;
 		}
 
-		auto lock = flock {
+		struct flock lock = {
 		    .l_type = F_WRLCK,
 		    .l_whence = SEEK_SET,
 		    .l_start = 0,
@@ -389,7 +389,7 @@ bool QsPaths::checkLock(const QString& path, InstanceLockInfo* info, bool allowD
 	auto file = QFile(QDir(path).filePath("instance.lock"));
 	if (!file.open(QFile::ReadOnly)) return false;
 
-	auto lock = flock {
+	struct flock lock = {
 	    .l_type = F_WRLCK,
 	    .l_whence = SEEK_SET,
 	    .l_start = 0,
diff --git a/src/core/toolsupport.cpp b/src/core/toolsupport.cpp
index afce008b..8aa5ac9d 100644
--- a/src/core/toolsupport.cpp
+++ b/src/core/toolsupport.cpp
@@ -54,7 +54,7 @@ bool QmlToolingSupport::lockTooling() {
 		return false;
 	}
 
-	auto lock = flock {
+	struct flock lock = {
 	    .l_type = F_WRLCK,
 	    .l_whence = SEEK_SET, // NOLINT (fcntl.h??)
 	    .l_start = 0,
diff --git a/src/services/pam/conversation.cpp b/src/services/pam/conversation.cpp
index 6d27978f..500abd5a 100644
--- a/src/services/pam/conversation.cpp
+++ b/src/services/pam/conversation.cpp
@@ -6,6 +6,8 @@
 #include <qsocketnotifier.h>
 #include <qstring.h>
 #include <qtmetamacros.h>
+#include <csignal>
+#include <sys/signal.h>
 #include <sys/wait.h>
 
 #include "../../core/logcat.hpp"
diff --git a/src/services/pam/qml.hpp b/src/services/pam/qml.hpp
index a8ffcc35..13ab593c 100644
--- a/src/services/pam/qml.hpp
+++ b/src/services/pam/qml.hpp
@@ -6,7 +6,11 @@
 #include <qtclasshelpermacros.h>
 #include <qthread.h>
 #include <qtmetamacros.h>
+#ifdef __FreeBSD__
+#include <security/pam_types.h>
+#else
 #include <security/_pam_types.h>
+#endif
 #include <security/pam_appl.h>
 
 #include "conversation.hpp"
diff --git a/src/services/pam/subprocess.cpp b/src/services/pam/subprocess.cpp
index f99b279d..dc362284 100644
--- a/src/services/pam/subprocess.cpp
+++ b/src/services/pam/subprocess.cpp
@@ -7,7 +7,11 @@
 #include <qloggingcategory.h>
 #include <qstring.h>
 #include <sched.h>
+#ifdef __FreeBSD__
+#include <security/pam_types.h>
+#else
 #include <security/_pam_types.h>
+#endif
 #include <security/pam_appl.h>
 #include <unistd.h>
 
@@ -83,7 +87,11 @@ PamIpcExitCode PamSubprocess::exec(const char* configDir, const char* config, co
 	logIf(this->log) << "Starting pam session for user \"" << user << "\" with config \"" << config
 	                 << "\" in dir \"" << configDir << "\"" << std::endl;
 
+#ifdef __FreeBSD__
+	auto result = pam_start(config, user, &conv, &handle);
+#else
 	auto result = pam_start_confdir(config, user, &conv, configDir, &handle);
+#endif
 
 	if (result != PAM_SUCCESS) {
 		logIf(true) << "Unable to start pam conversation with error \"" << pam_strerror(handle, result)