From 9c1dfd244f2bbab5f1a9038d545612768cd527c6 Mon Sep 17 00:00:00 2001
From: Matthew Broadway <matthew.broadway@navenio.com>
Date: Thu, 14 Feb 2019 10:55:16 +0000
Subject: [PATCH] fixed a bug where unsetting the cached python version leads
 to different numpy/cython/libraries being used

---
 cmake/GtsamCythonWrap.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cmake/GtsamCythonWrap.cmake b/cmake/GtsamCythonWrap.cmake
index f329d31ab..374e00c46 100644
--- a/cmake/GtsamCythonWrap.cmake
+++ b/cmake/GtsamCythonWrap.cmake
@@ -7,8 +7,10 @@ unset(PYTHON_INCLUDE_DIR CACHE)
 unset(PYTHON_MAJOR_VERSION CACHE)
 
 if(GTSAM_PYTHON_VERSION STREQUAL "Default")
+  find_package(PythonInterp REQUIRED)
   find_package(PythonLibs REQUIRED)
 else()
+  find_package(PythonInterp ${GTSAM_PYTHON_VERSION} EXACT REQUIRED)
   find_package(PythonLibs ${GTSAM_PYTHON_VERSION} EXACT REQUIRED)
 endif()
 find_package(Cython 0.25.2 REQUIRED)