diff --git a/modules/cblas.cmake b/modules/cblas.cmake
index ad980ed..80883c3 100644
--- a/modules/cblas.cmake
+++ b/modules/cblas.cmake
@@ -36,7 +36,7 @@ if(ENABLE_CBLAS)
 
     if(APPLE)
         _find_library(Accelerate cblas_dgemm CBLAS_LIBRARIES)
-        _find_include_dir(Accelerate/Accelerate.h /usr CBLAS_INCLUDE_DIR)
+        _find_include_dir(Accelerate.h /usr CBLAS_INCLUDE_DIR)
     else()
         _find_library(cblas cblas_dgemm CBLAS_LIBRARIES)
         _find_include_dir(cblas.h /usr CBLAS_INCLUDE_DIR)
diff --git a/modules/detect/detect_include_files.cmake b/modules/detect/detect_include_files.cmake
index dfa8dca..5e40bc1 100644
--- a/modules/detect/detect_include_files.cmake
+++ b/modules/detect/detect_include_files.cmake
@@ -8,7 +8,9 @@ function(_find_include_dir _names _hints _result)
     set(_all_include_files_work TRUE)
     foreach(_name ${_names})
         check_include_file(${_include_dir}/${_name} _include_file_works)
-        set(_all_include_files_work (${_all_include_files_work} AND ${_include_file_works}))
+        if(NOT _include_file_works)
+            set(_all_include_files_work FALSE)
+        endif()
     endforeach()
     if(${_all_include_files_work})
         set(${_result} ${_include_dir} PARENT_SCOPE)