Add correct fortran lib search path

cmake/external/openblas.cmake

@@ -29,7 +29,14 @@ IF(NOT ${CBLAS_FOUND})
 
     IF(CMAKE_COMPILER_IS_GNUCC)
         ENABLE_LANGUAGE(Fortran)
-        find_library(GFORTRAN_LIBRARY NAMES gfortran)
+        string(REGEX MATCHALL "[0-9]+" Fortran_VERSION ${CMAKE_Fortran_COMPILER_VERSION})
+        list(GET Fortran_VERSION 0 Fortran_MAJOR)
+        list(GET Fortran_VERSION 1 Fortran_MINOR)
+        find_library(GFORTRAN_LIBRARY NAMES gfortran PATHS 
+                     /lib
+                     /usr/lib
+                     /usr/lib/gcc/x86_64-linux-gnu/${Fortran_MAJOR}.${Fortran_MINOR}/
+                     /usr/lib/gcc/x86_64-linux-gnu/${Fortran_MAJOR}/)
         if (NOT GFORTRAN_LIBRARY)
             message(FATAL_ERROR "Cannot found gfortran library which it is used by openblas")
         endif()