diff --git a/.gitignore b/.gitignore
index 46c37bd9..135d671c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,3 +18,6 @@ win32/Debug
 win32/Release
 win32/x64
 extern/*
+
+.vscode/
+out/
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 967c4bb8..ab167e89 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,18 +15,20 @@ set(ZINT_VERSION "${ZINT_VERSION_MAJOR}.${ZINT_VERSION_MINOR}.${ZINT_VERSION_REL
 
 add_definitions(-DZINT_VERSION=\"${ZINT_VERSION}\")
 
-set(CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/cmake/modules")
+set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
 
-option(ZINT_DEBUG    "Set debug compile flags"         OFF)
-option(ZINT_NOOPT    "Set no optimize compile flags"   OFF)
-option(ZINT_SANITIZE "Set sanitize compile/link flags" OFF)
-option(ZINT_TEST     "Set test compile flag"           OFF)
-option(ZINT_COVERAGE "Set code coverage flags"         OFF)
-option(ZINT_SHARED   "Build shared library"            ON)
-option(ZINT_STATIC   "Build static library"            OFF)
-option(ZINT_USE_PNG  "Build with PNG support"          ON)
-option(ZINT_USE_QT   "Build with Qt support"           ON)
-option(ZINT_QT6      "If ZINT_USE_QT, use Qt6"         OFF)
+option(ZINT_DEBUG     "Set debug compile flags"         OFF)
+option(ZINT_NOOPT     "Set no optimize compile flags"   OFF)
+option(ZINT_SANITIZE  "Set sanitize compile/link flags" OFF)
+option(ZINT_TEST      "Set test compile flag"           OFF)
+option(ZINT_COVERAGE  "Set code coverage flags"         OFF)
+option(ZINT_SHARED    "Build shared library"            ON)
+option(ZINT_STATIC    "Build static library"            OFF)
+option(ZINT_USE_PNG   "Build with PNG support"          ON)
+option(ZINT_USE_QT    "Build with Qt support"           ON)
+option(ZINT_QT6       "If ZINT_USE_QT, use Qt6"         OFF)
+option(ZINT_UNINSTALL "Add uninstall target"            ON)
+option(ZINT_FRONTEND  "Build frontend"                  ON)
 
 if(NOT ZINT_SHARED AND NOT ZINT_STATIC)
     message(SEND_ERROR "Either ZINT_SHARED or ZINT_STATIC or both must be set")
@@ -143,7 +145,9 @@ if(NOT HAVE_GETOPT)
 endif()
 
 add_subdirectory(backend)
-add_subdirectory(frontend)
+if(ZINT_FRONTEND)
+    add_subdirectory(frontend)
+endif()
 
 if(NOT ZINT_USE_QT)
     message(STATUS "Qt support was disabled for this build")
@@ -184,13 +188,15 @@ else()
     endif()
 endif()
 
-configure_file(
-  "${CMAKE_CURRENT_SOURCE_DIR}/cmake_uninstall.cmake.in"
-  "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
-  IMMEDIATE @ONLY)
-
-add_custom_target(uninstall
-  "${CMAKE_COMMAND}" -P "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake")
+if(ZINT_UNINSTALL)
+    configure_file(
+      "${CMAKE_CURRENT_SOURCE_DIR}/cmake_uninstall.cmake.in"
+      "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake"
+      IMMEDIATE @ONLY)
+    
+    add_custom_target(uninstall
+      "${CMAKE_COMMAND}" -P "${CMAKE_CURRENT_BINARY_DIR}/cmake_uninstall.cmake")
+endif()
 
 # staniek: don't install
 if(DATA_INSTALL_DIR)
diff --git a/backend/zint.h b/backend/zint.h
index 6cbebba1..1e1b1120 100644
--- a/backend/zint.h
+++ b/backend/zint.h
@@ -372,6 +372,8 @@ extern "C" {
 #  else
 #    define ZINT_EXTERN extern
 #  endif
+#elif defined(__GNUC__) && __GNUC__ >= 4
+#  define ZINT_EXTERN extern __attribute__((visibility("default")))
 #else
 #  define ZINT_EXTERN extern
 #endif
diff --git a/backend_qt/CMakeLists.txt b/backend_qt/CMakeLists.txt
index 1ac488f2..bf4cd1dc 100644
--- a/backend_qt/CMakeLists.txt
+++ b/backend_qt/CMakeLists.txt
@@ -17,7 +17,7 @@ add_library(${PROJECT_NAME} STATIC ${QZint_SRCS})
 set_target_properties(${PROJECT_NAME} PROPERTIES  SOVERSION "${ZINT_VERSION_MAJOR}.${ZINT_VERSION_MINOR}"
                                         VERSION ${ZINT_VERSION})
 
-target_include_directories(${PROJECT_NAME} PUBLIC "${CMAKE_SOURCE_DIR}/backend")
+target_include_directories(${PROJECT_NAME} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../backend")
 
 if(ZINT_SHARED)
     target_link_libraries(${PROJECT_NAME} zint)
diff --git a/frontend/CMakeLists.txt b/frontend/CMakeLists.txt
index b5b6d98f..07d176eb 100644
--- a/frontend/CMakeLists.txt
+++ b/frontend/CMakeLists.txt
@@ -12,7 +12,7 @@ if(WIN32)
     target_sources(${PROJECT_NAME} PRIVATE zint.rc)
 endif()
 
-target_include_directories(${PROJECT_NAME} PUBLIC "${CMAKE_SOURCE_DIR}/backend")
+target_include_directories(${PROJECT_NAME} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../backend")
 
 set_target_properties(${PROJECT_NAME} PROPERTIES OUTPUT_NAME "zint")
 
@@ -27,7 +27,7 @@ endif()
 
 install(TARGETS ${PROJECT_NAME} DESTINATION "${BIN_INSTALL_DIR}" RUNTIME)
 if(UNIX)
-    install(FILES "${CMAKE_SOURCE_DIR}/docs/zint.1" DESTINATION "${MAN_INSTALL_DIR}/man1" COMPONENT doc)
+    install(FILES "${CMAKE_CURRENT_SOURCE_DIR}/../docs/zint.1" DESTINATION "${MAN_INSTALL_DIR}/man1" COMPONENT doc)
 endif()
 
 if(ZINT_TEST)
diff --git a/frontend_qt/CMakeLists.txt b/frontend_qt/CMakeLists.txt
index 767d068d..a3e0f901 100644
--- a/frontend_qt/CMakeLists.txt
+++ b/frontend_qt/CMakeLists.txt
@@ -46,7 +46,7 @@ if(WIN32)
     target_sources(${PROJECT_NAME} PRIVATE res/qtZint.rc)
 endif()
 
-target_include_directories(${PROJECT_NAME} PUBLIC "${CMAKE_SOURCE_DIR}/backend" "${CMAKE_SOURCE_DIR}/backend_qt")
+target_include_directories(${PROJECT_NAME} PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/../backend" "${CMAKE_CURRENT_SOURCE_DIR}/../backend_qt")
 
 if(ZINT_SHARED)
     target_link_libraries(${PROJECT_NAME} zint)