diff --git a/CMakeLists.txt b/CMakeLists.txt
index b27b3a4..b67b5c0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ endif()
 if(CMAKE_CXX_COMPILER_ID STREQUAL "Intel")
   message("setting intel true")
   set(IntelComp true )
-elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU*")
+elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU*" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang*")
   set(GNUComp true )
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "pgc*")
   set(PGIComp true )
@@ -27,10 +27,9 @@ if( (BUILD_RELEASE) OR (BUILD_PRODUCTION) )
     message("setting intel flags")
     set(CMAKE_Fortran_FLAGS "-O2 -g -xHOST -traceback -free -convert big_endian -assume byterecl " CACHE INTERNAL "" )
   elseif(GNUComp)
-    set(CMAKE_Fortran_FLAGS "-O2 -ggdb -ffree-form -funroll-loops -Wall " CACHE INTERNAL "" )
-  elseif(PGIComp)
+    set(CMAKE_Fortran_FLAGS "-O2 -ggdb -fbacktrace -ffree-form -fconvert=big-endian -funroll-loops -Wall " CACHE INTERNAL "" )
   else()
-    message("unkown compiler!")
+    message("unknown compiler!")
     exit()
   endif()
 endif()