diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2616d06..4be28ac 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,10 +34,11 @@ find_package(MPFR REQUIRED)
 if (WITH_NTL)
     find_package(NTL REQUIRED)
 endif()
-find_package(PythonInterp REQUIRED)
 
+if(WITH_CBLAS)
 find_package(CBLAS)
 set(FLINT_USES_BLAS ${CBLAS_FOUND})
+endif()
 
 if(CMAKE_BUILD_TYPE STREQUAL Debug)
   set(FLINT_WANT_ASSERT ON)
@@ -47,6 +48,8 @@ endif()
 
 if(MSVC)
     find_package(PThreads REQUIRED)
+    set(PThreads_LIBRARIES ${PThreads4W_LIBRARY})
+    set(PThreads_INCLUDE_DIRS ${PThreads4W_INCLUDE_DIR})
     set(FLINT_USES_PTHREAD ON CACHE BOOL "Use POSIX Threads.")
 else()
     option(CMAKE_THREAD_PREFER_PTHREAD "Prefer pthreads" yes)