diff --git a/.travis.yml b/.travis.yml
index 9025a3e47fdd4332a09784e1593339ef6157e3eb..5e262d10f7bfabf3785494bae67cae656b7d0cc7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,7 +18,7 @@ matrix:
         - MATRIX_EVAL="CXX=g++-7 && CC=gcc-7"
     - os: osx
       osx_image: xcode9.4
-      env: 
+      env:
         - MATRIX_EVAL="CXX=clang++ && CC=clang"
 
 before_install:
@@ -39,7 +39,8 @@ install:
     fi
   - bash miniconda.sh -b -p $HOME/miniconda
   - export PATH="$HOME/miniconda/bin:$PATH"
-  - conda install -y -c conda-forge cmake
+  - conda env create -f environment.yml -n eal
+  - source activate eal
 
 script:
   - mkdir build
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 60154b7626bb2d862e0a56f6bf3c11d2b33384ff..3e904adc321d19cff6eac67bfe6ea2eeec7dfb54 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,6 +17,9 @@ include(CTest)
 
 set(CMAKE_CXX_STANDARD 11)
 
+# Third Party Dependencies
+find_package(GSL)
+
 # Library setup
 add_library(usgsephem SHARED
             src/eal.cpp
@@ -28,13 +31,18 @@ set_target_properties(usgsephem PROPERTIES
 set(EPHEM_INCLUDE_DIRS "${CMAKE_CURRENT_SOURCE_DIR}/include/"
                        "${CMAKE_CURRENT_SOURCE_DIR}/include/json")
 target_include_directories(usgsephem
+                           PRIVATE
+                           ${GSL_INCLUDE_DIRS}
                            PUBLIC
-                           "${EPHEM_INCLUDE_DIRS}"
+                           ${EPHEM_INCLUDE_DIRS}
 )
 
 # Setup for GoogleTest
 find_package (Threads)
-target_link_libraries(usgsephem PUBLIC
+target_link_libraries(usgsephem
+                      PRIVATE
+                      ${GSL_LIBRARIES}
+                      PUBLIC
                       gtest ${CMAKE_THREAD_LIBS_INIT})
 
 # Setup for ctest
diff --git a/environment.yml b/environment.yml
new file mode 100644
index 0000000000000000000000000000000000000000..6452d766257edc291b6c572c2cddc786016f5158
--- /dev/null
+++ b/environment.yml
@@ -0,0 +1,8 @@
+name: eal
+
+channels:
+  - conda-forge
+
+dependencies:
+  - cmake>=3.10
+  - gsl
diff --git a/src/eal.cpp b/src/eal.cpp
index 8d5181083899ab38718dde75fb095a9a14c5ae40..364088c0317cb7ce876a8eb7cf7d35dbbbd587c9 100644
--- a/src/eal.cpp
+++ b/src/eal.cpp
@@ -1,12 +1,13 @@
-
 #include "eal.h"
 
 #include <json.hpp>
+
+#include <gsl/gsl_spline.h>
+
 #include <string>
 
 using json = nlohmann::json;
 
-
 using namespace eal;