--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -130,6 +130,11 @@ find_package(Qt6    6.5 REQUIRED COMPONE
 include_directories(${Boost_INCLUDE_DIRS})
 include_directories(${FFTW3_INCLUDE_DIRS})
 
+# Debian: use system libraries
+find_package(PkgConfig)
+pkg_check_modules(EIGEN REQUIRED IMPORTED_TARGET GLOBAL eigen3)
+pkg_check_modules(SQLITE REQUIRED IMPORTED_TARGET GLOBAL sqlite3)
+
 #------------------------------------------------------------------------------#
 # OSX requires an icon file resource.
 #------------------------------------------------------------------------------#
@@ -241,7 +246,6 @@ target_precompile_headers(
 
 target_sources(
   ${TARGET} PRIVATE
-  vendor/sqlite3/sqlite3.c
   JS8_Audio/AudioDevice.cpp
   JS8_Audio/BWFFile.cpp
   JS8_Audio/NotificationAudio.cpp
@@ -361,6 +365,8 @@ target_link_libraries(
   Qt::Network
   Qt::SerialPort
   Qt::Widgets
+  PkgConfig::EIGEN
+  PkgConfig::SQLITE
 )
 
 #------------------------------------------------------------------------------#
--- a/JS8_Main/Flatten.cpp
+++ b/JS8_Main/Flatten.cpp
@@ -26,7 +26,7 @@
 #include <numbers>
 #include <utility>
 #include <vector>
-#include <vendor/Eigen/Dense>
+#include <Eigen/Dense>
 
 /******************************************************************************/
 // Flatten Constants
--- a/JS8_Mode/Detector.h
+++ b/JS8_Mode/Detector.h
@@ -4,7 +4,7 @@
 #include "JS8_Audio/AudioDevice.h"
 
 #include <QMutex>
-#include <vendor/Eigen/Dense>
+#include <Eigen/Dense>
 
 #include <array>
 
--- a/JS8_Mode/JS8.cpp
+++ b/JS8_Mode/JS8.cpp
@@ -45,7 +45,7 @@
 #include <unordered_map>
 #include <utility>
 #include <vector>
-#include <vendor/Eigen/Dense>
+#include <Eigen/Dense>
 
 Q_DECLARE_LOGGING_CATEGORY(decoder_js8);
 
--- a/JS8_Main/HBBlockingDB.cpp
+++ b/JS8_Main/HBBlockingDB.cpp
@@ -4,7 +4,7 @@
  */
 
 #include "HBBlockingDB.h"
-#include "vendor/sqlite3/sqlite3.h"
+#include "sqlite3.h"
 #include "DriftingDateTime.h"
 
 #include <QTimeZone>
--- a/JS8_Main/Inbox.cpp
+++ b/JS8_Main/Inbox.cpp
@@ -5,7 +5,7 @@
 
 #include "Inbox.h"
 #include "DriftingDateTime.h"
-#include "vendor/sqlite3/sqlite3.h"
+#include "sqlite3.h"
 
 #include <QLoggingCategory>
 
