--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -121,13 +121,7 @@ if(BLAS_FOUND)
   set(BLAS_LIB_EXPORT ${BLAS_LIB_STR})
 else()
   message("-- Did not find or specify BLAS so configure to build internal CBLAS ...")
-  add_subdirectory(CBLAS)
-  set(BLAS_LIB blas)
-  if (BUILD_SHARED_LIBS)  # export to be referenced by downstream makefile
-      set(BLAS_LIB_EXPORT ${CMAKE_INSTALL_PREFIX}/CBLAS/libblas.so)
-  else()
-      set(BLAS_LIB_EXPORT ${CMAKE_INSTALL_PREFIX}/CBLAS/libblas.a)
-  endif()
+  message( FATAL_ERROR "Could not find BLAS, refusing to use internal copy" )
 endif()
 
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