diff --git a/.circleci/config.yml b/.circleci/config.yml
index 214632c3..4cf7b375 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -77,7 +77,7 @@ jobs:
                   -DUSE_VALGRIND=OFF \
                   -DENABLE_THREAD_POOL_TESTS=OFF \
                   -DLLVM_VERSION=${LLVM_VERSION} \
-                  -DCPPAD_HOME="${curdir}/${CPPAD_INSTALL}/include" \
+                  -DCPPAD_HOME="${curdir}/${CPPAD_INSTALL}" \
                   -DEIGEN3_INCLUDE_DIR="${curdir}/${EIGEN_INSTALL}" \
                   ..
             cd test
diff --git a/cmake/FindCppAD.cmake b/cmake/FindCppAD.cmake
index a3062c19..1092278e 100644
--- a/cmake/FindCppAD.cmake
+++ b/cmake/FindCppAD.cmake
@@ -27,7 +27,7 @@ ENDIF ()
 IF (DEFINED CPPAD_HOME)
 
     FIND_PATH(CPPAD_INCLUDE_DIR NAMES cppad/cppad.hpp
-            PATHS "${CPPAD_HOME}"
+            PATHS "${CPPAD_HOME}/include"
             NO_DEFAULT_PATH)
 
     FIND_LIBRARY(CPPAD_LIBRARY
diff --git a/include/cppad/cg/dae_index_reduction/dummy_deriv.hpp b/include/cppad/cg/dae_index_reduction/dummy_deriv.hpp
index f8d60de3..63c93441 100644
--- a/include/cppad/cg/dae_index_reduction/dummy_deriv.hpp
+++ b/include/cppad/cg/dae_index_reduction/dummy_deriv.hpp
@@ -429,7 +429,6 @@ class DummyDerivatives : public DaeIndexReduction<Base> {
         using namespace std;
         using std::vector;
         using std::map;
-        using std::map;
 
         auto& graph = idxIdentify_->getGraph();
         //auto& vnodes = graph.variables();
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 5c084f94..5fd78aec 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -168,6 +168,10 @@ FUNCTION(add_cppadcg_test source_file)
     IF( UNIX )
         TARGET_LINK_LIBRARIES(${test_target_name} ${DL_LIBRARIES})
     ENDIF()
+    TARGET_LINK_LIBRARIES(${test_target_name} ${CPPAD_LIBRARIES})
+    TARGET_INCLUDE_DIRECTORIES(${test_target_name} PRIVATE ${CPPAD_INCLUDE_DIRS})
+    TARGET_COMPILE_DEFINITIONS(${test_target_name}
+                               PRIVATE CPPAD_CG_C_COMPILER=\"${CMAKE_C_COMPILER}\")
 
     ADD_TEST(NAME ${test_target_name}
             COMMAND ${test_target_name})
diff --git a/test/cppad/cg/CppADCGDynamicAtomicNestedTest.hpp b/test/cppad/cg/CppADCGDynamicAtomicNestedTest.hpp
index ca8b2984..d9e91e8f 100644
--- a/test/cppad/cg/CppADCGDynamicAtomicNestedTest.hpp
+++ b/test/cppad/cg/CppADCGDynamicAtomicNestedTest.hpp
@@ -468,7 +468,7 @@ class CppADCGDynamicAtomicNestedTest : public CppADCGTest {
          * (compile source code)
          */
         DynamicModelLibraryProcessor<double> p(compDynHelp, "innerModel");
-        GccCompiler<double> compiler1;
+        GccCompiler<double> compiler1(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler1);
 
         _dynamicLib = p.createDynamicLibrary(compiler1);
@@ -514,7 +514,7 @@ class CppADCGDynamicAtomicNestedTest : public CppADCGTest {
          * Create the dynamic library
          * (compile source code)
          */
-        GccCompiler<double> compiler2;
+        GccCompiler<double> compiler2(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler2);
 
         DynamicModelLibraryProcessor<double> p2(compDynHelp2, "outerModel");
@@ -637,7 +637,7 @@ class CppADCGDynamicAtomicNestedTest : public CppADCGTest {
          * Create the dynamic library
          * (compile source code)
          */
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler);
 
         DynamicModelLibraryProcessor<double> p(compDynHelp);
diff --git a/test/cppad/cg/CppADCGDynamicAtomicTest.hpp b/test/cppad/cg/CppADCGDynamicAtomicTest.hpp
index 067d3115..037bb265 100644
--- a/test/cppad/cg/CppADCGDynamicAtomicTest.hpp
+++ b/test/cppad/cg/CppADCGDynamicAtomicTest.hpp
@@ -763,7 +763,7 @@ class CppADCGDynamicAtomicTest : public CppADCGModelTest {
          * Create the dynamic library
          * (generate and compile source code)
          */
-        GccCompiler<double> compiler1;
+        GccCompiler<double> compiler1(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler1);
         compiler1.setSourcesFolder("sources_atomiclibatomiclib_" + _modelName);
         compiler1.setSaveToDiskFirst(true);
@@ -815,7 +815,7 @@ class CppADCGDynamicAtomicTest : public CppADCGModelTest {
         compDynHelp2.setVerbose(this->verbose_);
 
         DynamicModelLibraryProcessor<double> p2(compDynHelp2, "outerModel");
-        GccCompiler<double> compiler2;
+        GccCompiler<double> compiler2(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler2);
         compiler2.setSourcesFolder("sources_atomiclibatomiclib_" + _modelName);
         compiler2.setSaveToDiskFirst(true);
@@ -912,7 +912,7 @@ class CppADCGDynamicAtomicTest : public CppADCGModelTest {
 
         DynamicModelLibraryProcessor<double> p(compDynHelp);
 
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler);
         compiler.setSourcesFolder(folder);
         compiler.setSaveToDiskFirst(true);
@@ -1069,7 +1069,7 @@ class CppADCGDynamicAtomicTest : public CppADCGModelTest {
 
         DynamicModelLibraryProcessor<double> p(libSrcGen);
 
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler);
         compiler.setSourcesFolder(folder);
         compiler.setSaveToDiskFirst(true);
diff --git a/test/cppad/cg/CppADCGDynamicTest.hpp b/test/cppad/cg/CppADCGDynamicTest.hpp
index 6f30ab29..7db3b88e 100644
--- a/test/cppad/cg/CppADCGDynamicTest.hpp
+++ b/test/cppad/cg/CppADCGDynamicTest.hpp
@@ -154,7 +154,7 @@ class CppADCGDynamicTest : public CppADCGModelTest {
         const auto& cp = p;
         ASSERT_TRUE(cp.getOptions().empty());
 
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         //compiler.setSaveToDiskFirst(true); // useful to detect problem
         prepareTestCompilerFlags(compiler);
         if(libSourceGen.getMultiThreading() == MultiThreadingType::OPENMP) {
diff --git a/test/cppad/cg/CppADCGOperationTestImpl.hpp b/test/cppad/cg/CppADCGOperationTestImpl.hpp
index 1b997690..2d7b9e66 100644
--- a/test/cppad/cg/CppADCGOperationTestImpl.hpp
+++ b/test/cppad/cg/CppADCGOperationTestImpl.hpp
@@ -56,7 +56,7 @@ void* CppADCGOperationTest::getFunction(void * libHandle, const std::string& fun
 void CppADCGOperationTest::compile(const std::string& source,
                                    const std::string& library) {
 
-    GccCompiler<double> compiler;
+    GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
     prepareTestCompilerFlags(compiler);
 
     try {
diff --git a/test/cppad/cg/model/dynamiclib/dynamic_atomic_2.cpp b/test/cppad/cg/model/dynamiclib/dynamic_atomic_2.cpp
index 93eb4dcb..6e198197 100644
--- a/test/cppad/cg/model/dynamiclib/dynamic_atomic_2.cpp
+++ b/test/cppad/cg/model/dynamiclib/dynamic_atomic_2.cpp
@@ -104,7 +104,7 @@ class CppADCGDynamicAtomic2Test : public CppADCGTest {
         SaveFilesModelLibraryProcessor<double>::saveLibrarySourcesTo(compDynHelp, MODEL_NAME);
 
         DynamicModelLibraryProcessor<double> p(compDynHelp);
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler);
 
         _dynamicLib = p.createDynamicLibrary(compiler);
diff --git a/test/cppad/cg/model/dynamiclib/dynamic_forward_reverse.cpp b/test/cppad/cg/model/dynamiclib/dynamic_forward_reverse.cpp
index 13a63df6..8f144a09 100644
--- a/test/cppad/cg/model/dynamiclib/dynamic_forward_reverse.cpp
+++ b/test/cppad/cg/model/dynamiclib/dynamic_forward_reverse.cpp
@@ -80,7 +80,7 @@ class CppADCGDynamicForRevTest2 : public CppADCGTest {
         compHelp.setCreateSparseJacobian(true);
         compHelp.setCreateSparseHessian(true);
 
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler);
 
         ModelLibraryCSourceGen<double> compDynHelp(compHelp);
diff --git a/test/cppad/cg/model/dynamiclib/dynamic_forward_reverse_2.cpp b/test/cppad/cg/model/dynamiclib/dynamic_forward_reverse_2.cpp
index fec0c059..6742b987 100644
--- a/test/cppad/cg/model/dynamiclib/dynamic_forward_reverse_2.cpp
+++ b/test/cppad/cg/model/dynamiclib/dynamic_forward_reverse_2.cpp
@@ -88,7 +88,7 @@ class CppADCGDynamicForRevTest : public CppADCGTest {
         compHelp.setCreateSparseJacobian(true);
         compHelp.setCreateSparseHessian(true);
 
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler);
 
         ModelLibraryCSourceGen<double> compDynHelp(compHelp);
diff --git a/test/cppad/cg/models/collocation.hpp b/test/cppad/cg/models/collocation.hpp
index 87eb608c..d00ba59e 100644
--- a/test/cppad/cg/models/collocation.hpp
+++ b/test/cppad/cg/models/collocation.hpp
@@ -279,7 +279,7 @@ class CollocationModel : public PatternTestModel<T> {
         //SaveFilesModelLibraryProcessor<double>::saveLibrarySourcesTo(compDynHelpL, "sources_" + lName);
 
         DynamicModelLibraryProcessor<double> p(compDynHelpL, lName);
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler);
         compiler.setSourcesFolder("sources_" + lName);
         compiler.setSaveToDiskFirst(true);
diff --git a/test/cppad/cg/patterns/CppADCGPatternTest.hpp b/test/cppad/cg/patterns/CppADCGPatternTest.hpp
index e414df98..f97f96a5 100644
--- a/test/cppad/cg/patterns/CppADCGPatternTest.hpp
+++ b/test/cppad/cg/patterns/CppADCGPatternTest.hpp
@@ -404,7 +404,7 @@ class CppADCGPatternTest : public CppADCGTest {
         if (!customHessSparsity_.empty())
             compHelpL.setCustomSparseHessianElements(customHessSparsity_);
 
-        GccCompiler<double> compiler;
+        GccCompiler<double> compiler(CPPAD_CG_C_COMPILER);
         prepareTestCompilerFlags(compiler);
         compiler.setSourcesFolder("sources_" + libBaseName);
         compiler.setSaveToDiskFirst(true);