diff --git a/CMakeLists.txt b/CMakeLists.txt
index e22a9445e240502779c93812c251631f763e1faf..3fd1f5876ccdcadc4a32aeec370b0f75ce361a0e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,12 +20,14 @@ set(CMAKE_CXX_STANDARD 11)
 # Library setup
 add_library(usgsephem SHARED
             src/TestObject.cpp
+            src/eal.cpp
 )
 set_target_properties(usgsephem PROPERTIES
     VERSION ${PROJECT_VERSION}
     SOVERSION 1
 )
-set(EPHEM_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/include")
+set(EPHEM_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/include/"
+                       "${CMAKE_CURRENT_SOURCE_DIR}/include/json")
 target_include_directories(usgsephem
                            PUBLIC
                            "${EPHEM_INCLUDE_DIRS}"
diff --git a/include/eal.h b/include/eal.h
new file mode 100644
index 0000000000000000000000000000000000000000..72e8ef35b403b46863247a151adb4e309f0def4e
--- /dev/null
+++ b/include/eal.h
@@ -0,0 +1,14 @@
+#ifndef eal_H
+#define eal_H
+
+#include <string>
+
+class eal {
+
+public:
+
+  std::string constructStateFromIsd(const std::string positionRotationData) const;
+
+};
+
+#endif
diff --git a/src/eal.cpp b/src/eal.cpp
index a8b101a90eef3758e59965fb91d7686c253e92f4..6f2729f1ea8718940378918157a1ddca7cd1e663 100644
--- a/src/eal.cpp
+++ b/src/eal.cpp
@@ -1,11 +1,13 @@
 
+#include "eal.h"
+
 #include <json.hpp>
+#include <string>
 
 using json = nlohmann::json;
 
 
-std::string eal::constructStateFromIsd(const std::string positionRotationData) const
-{
+std::string eal::constructStateFromIsd(const std::string positionRotationData) const {
    // Parse the position and rotation data from isd
    json isd = json::parse(positionRotationData);
    json state;