diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -41,11 +41,13 @@
     project(EvtGen
         VERSION 2.0.0
         DESCRIPTION "Monte Carlo generator of particle decays, in particular the weak decays of heavy flavour particles such as B mesons."
+        LANGUAGES C CXX
         )
 else()
     project(EvtGen
         VERSION 2.0.0
         DESCRIPTION "Monte Carlo generator of particle decays, in particular the weak decays of heavy flavour particles such as B mesons."
+        LANGUAGES C CXX
         HOMEPAGE_URL "https://evtgen.hepforge.org"
         )
 endif()
diff --git a/cmake/Modules/FindPythia8.cmake b/cmake/Modules/FindPythia8.cmake
--- a/cmake/Modules/FindPythia8.cmake
+++ b/cmake/Modules/FindPythia8.cmake
@@ -56,7 +56,7 @@
 
 foreach(component ${Pythia8_FIND_COMPONENTS})
   find_library(PYTHIA8_${component}_LIBRARY NAMES ${component} ${_${component}_names}
-               HINTS $ENV{PYTHIA8_ROOT_DIR}/lib ${PYTHIA8_ROOT_DIR}/lib)
+               HINTS $ENV{PYTHIA8_ROOT_DIR}/lib ${PYTHIA8_ROOT_DIR}/lib $ENV{PYTHIA8_ROOT_DIR}/lib64 ${PYTHIA8_ROOT_DIR}/lib64 )
   if (PYTHIA8_${component}_LIBRARY)
     set(PYTHIA8_${component}_FOUND 1)
     list(APPEND PYTHIA8_LIBRARIES ${PYTHIA8_${component}_LIBRARY})