diff --git a/CMakeLists.txt b/CMakeLists.txt
index b0da5ec..da40299 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -33,6 +33,7 @@ option(CHECK_INCONSISTENCIES "Check inconsistencies at each step" OFF)
 option(ENABLE_API "oRatio API" OFF)
 
 add_library(oRatioLib src/solver.cpp src/graph.cpp src/flaw.cpp src/resolver.cpp src/smart_type.cpp src/flaws/atom_flaw.cpp src/flaws/bool_flaw.cpp src/flaws/disj_flaw.cpp src/flaws/disjunction_flaw.cpp src/flaws/enum_flaw.cpp src/types/agent.cpp src/types/state_variable.cpp src/types/consumable_resource.cpp src/types/reusable_resource.cpp $<$<BOOL:${ENABLE_API}>:${CMAKE_CURRENT_SOURCE_DIR}/src/solver_api.cpp>)
+add_dependencies(oRatioLib RiDDLe SeMiTONE)
 target_link_libraries(oRatioLib PUBLIC RiDDLe SeMiTONE)
 target_include_directories(oRatioLib PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include> $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include/flaws> $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include/types> $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}>)
 
@@ -70,9 +71,10 @@ if(ENABLE_API)
     target_compile_definitions(oRatioLib PRIVATE ENABLE_API)
 endif()
 
-add_executable(oRatio src/main.cpp)
+add_executable(oRatio src/main.cpp src/solver_api.cpp)
+add_dependencies(oRatio oRatioLib)
 target_link_libraries(oRatio PRIVATE oRatioLib)
-target_include_directories(oRatio PRIVATE $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>)
+target_compile_definitions(oRatio PRIVATE ENABLE_API=1 COMPUTE_NAMES=1)
 
 if(BUILD_TESTING)
     add_subdirectory(tests)
diff --git a/src/main.cpp b/src/main.cpp
index 8f2b3d3..07873b9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,6 +1,55 @@
 #include "solver.hpp"
+#include "logging.hpp"
+#include "solver_api.hpp"
+#include <chrono>
+#include <numeric>
+#include <fstream>
 
 int main(int argc, char const *argv[])
 {
+    if (argc < 3)
+    {
+        LOG_FATAL("usage: oRatio <input-file> [<input-file> ...] <output-file>");
+        return -1;
+    }
+
+    // the problem files..
+    std::vector<std::string> prob_names;
+    for (int i = 1; i < argc - 1; i++)
+        prob_names.push_back(argv[i]);
+
+    // the solution file..
+    std::string sol_name = argv[argc - 1];
+
+    LOG_INFO("starting oRatio");
+    auto start = std::chrono::high_resolution_clock::now();
+    auto s = std::make_shared<ratio::solver>();
+    s->init();
+    try
+    {
+        s->read(prob_names);
+
+        if (s->solve())
+        {
+            LOG_INFO("hurray!! we have found a solution..");
+
+            std::ofstream sol_file;
+            sol_file.open(sol_name);
+            sol_file << to_json(*s).dump();
+            sol_file.close();
+        }
+        else
+        {
+            LOG_INFO("the problem is unsolvable..");
+        }
+        auto dur = std::chrono::high_resolution_clock::now() - start;
+        LOG_INFO("running time: " + std::to_string(std::chrono::duration_cast<std::chrono::milliseconds>(dur).count()) + " ms");
+    }
+    catch (const std::exception &ex)
+    {
+        LOG_FATAL("exception: " + std::string(ex.what()));
+        return 1;
+    }
+
     return 0;
 }
diff --git a/tests/test_solver.cpp b/tests/test_solver.cpp
index 934e42b..2077521 100644
--- a/tests/test_solver.cpp
+++ b/tests/test_solver.cpp
@@ -1,7 +1,7 @@
-#include <chrono>
-#include <numeric>
 #include "solver.hpp"
 #include "logging.hpp"
+#include <chrono>
+#include <numeric>
 
 int main(int argc, char const *argv[])
 {