4 files changed, 29 insertions, 22 deletions
diff --git a/test/libapt/CMakeLists.txt b/test/libapt/CMakeLists.txt
index 7f9990526..f3df14848 100644
--- a/test/libapt/CMakeLists.txt
+++ b/test/libapt/CMakeLists.txt
@@ -1,22 +1,33 @@
-include(ExternalProject)
-
 set(GTEST_ROOT "/usr/src/gtest" CACHE FILEPATH "Path to GTest CMake project")
 
-message(STATUS "Found GTest at ${GTEST_ROOT}")
+find_package(GTest)
+set(GTEST_DEPENDENCIES)
+
+if(NOT GTEST_FOUND AND EXISTS ${GTEST_ROOT})
+   include(ExternalProject)
+   ExternalProject_Add(gtest PREFIX ./gtest
+                             SOURCE_DIR ${GTEST_ROOT}
+                             INSTALL_COMMAND true)
 
-if (EXISTS ${GTEST_ROOT})
+   link_directories(${CMAKE_CURRENT_BINARY_DIR}/gtest/src/gtest-build)
 
-ExternalProject_Add(gtest PREFIX ./gtest
-                          SOURCE_DIR ${GTEST_ROOT}
-                          INSTALL_COMMAND true)
+   set(GTEST_LIBRARIES "-lgtest")
+   set(GTEST_DEPENDENCIES "gtest")
+   set(GTEST_FOUND TRUE)
+   find_path(GTEST_INCLUDE_DIRS NAMES gtest/gtest.h)
 
-link_directories(${CMAKE_CURRENT_BINARY_DIR}/gtest/src/gtest-build)
-FILE(GLOB files gtest_runner.cc *-helpers.cc *_test.cc)
-add_executable(libapt_test ${files})
-target_link_libraries(libapt_test -lgtest ${CMAKE_THREAD_LIBS_INIT} apt-private apt-inst)
-add_dependencies(libapt_test gtest)
-add_test(NAME AptTests
-         COMMAND libapt_test
-         WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
+   message(STATUS "Found GTest at ${GTEST_ROOT}, headers at ${GTEST_INCLUDE_DIRS}")
+endif()
 
+if(GTEST_FOUND)
+   file(GLOB files gtest_runner.cc *-helpers.cc *_test.cc)
+   add_executable(libapt_test ${files})
+   target_include_directories(libapt_test PRIVATE ${GTEST_INCLUDE_DIRS})
+   target_link_libraries(libapt_test ${GTEST_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} apt-private apt-inst)
+   if (GTEST_DEPENDENCIES)
+      add_dependencies(libapt_test ${GTEST_DEPENDENCIES})
+   endif()
+   add_test(NAME AptTests
+            COMMAND libapt_test
+            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR})
 endif()
diff --git a/test/libapt/commandline_test.cc b/test/libapt/commandline_test.cc
index 7783c47a4..97725c854 100644
--- a/test/libapt/commandline_test.cc
+++ b/test/libapt/commandline_test.cc
@@ -17,10 +17,6 @@ class CLT: public CommandLine {
       }
 };
 
-bool ShowHelp(CommandLine &) {return false;}
-std::vector<aptDispatchWithHelp> GetCommands() {return {};}
-
-
 TEST(CommandLineTest,SaveInConfig)
 {
 #define APT_EXPECT_CMD(x, ...) { const char * const argv[] = { __VA_ARGS__ }; EXPECT_EQ(x, CLT::AsString(argv, sizeof(argv)/sizeof(argv[0]))); }
@@ -166,7 +162,7 @@ TEST(CommandLineTest, BoolParsing)
 
 }
 
-bool DoVoid(CommandLine &) { return false; }
+static bool DoVoid(CommandLine &) { return false; }
 
 TEST(CommandLineTest,GetCommand)
 {
diff --git a/test/libapt/strutil_test.cc b/test/libapt/strutil_test.cc
index 90a5817ad..d7700bd54 100644
--- a/test/libapt/strutil_test.cc
+++ b/test/libapt/strutil_test.cc
@@ -168,7 +168,7 @@ TEST(StrUtilTest,Base64Encode)
    EXPECT_EQ("Lg==", Base64Encode("."));
    EXPECT_EQ("", Base64Encode(""));
 }
-void ReadMessagesTestWithNewLine(char const * const nl, char const * const ab)
+static void ReadMessagesTestWithNewLine(char const * const nl, char const * const ab)
 {
    SCOPED_TRACE(SubstVar(SubstVar(nl, "\n", "n"), "\r", "r") + " # " + ab);
    FileFd fd;
diff --git a/test/libapt/tagsection_test.cc b/test/libapt/tagsection_test.cc
index f250177af..779932595 100644
--- a/test/libapt/tagsection_test.cc
+++ b/test/libapt/tagsection_test.cc
@@ -24,7 +24,7 @@ std::string overrideValue = "1";
    std::cerr << "«" << std::endl;;
 */
 
-void setupTestcaseStart(FileFd &fd, pkgTagSection &section, std::string &content)
+static void setupTestcaseStart(FileFd &fd, pkgTagSection &section, std::string &content)
 {
    createTemporaryFile("writesection", fd, NULL, NULL);
    content = "Package: " + packageValue + "\n"