SConstruct: do not build xgps and xgpsspeed if pycairo not found.

Used to not be a problem, but now 'scons check' tests the python
programs, and those two fail without pycairo.

1 files changed, 11 insertions, 0 deletions

diff --git a/SConstruct b/SConstruct
index df3c48a6..f500bd8a 100644
--- a/SConstruct
+++ b/SConstruct
@@ -34,6 +34,7 @@ from __future__ import print_function
 import ast
 import copy
 import glob
+import imp         # for imp.find_module('gps'), imp deprecated in 3.4
 import operator
 import os
 import platform
@@ -1364,6 +1365,16 @@ if not env['python']:
     python_progs = []
 else:
     python_progs = ["gegps", "gpscat", "gpsfake", "gpsprof"]
+
+    # check for pycairo
+    try:
+        imp.find_module('cairo')
+    except ImportError:
+        # no pycairo, can't build xgps, xgpsspeed
+        announce("Python module pycairo not found, "
+                 "xgps and xgpsspeed will not be installed")
+        env['xgps'] = False
+
     if env['xgps']:
         python_progs.extend(["xgps", "xgpsspeed"])
     python_modules = Glob('gps/*.py')