Add pthreads

meson.build

@@ -4,6 +4,8 @@ project('libpinkIndexer', ['cpp'],
         meson_version: '>=0.49.0',
         default_options: ['buildtype=debugoptimized'])
 
+pthreaddep = dependency('threads', required: true)
+
 eigendep = dependency('eigen3',
                       required: true,
                       fallback: ['eigen', 'eigen_dep'])
@@ -30,7 +32,7 @@ pinkindexer = library('pinkIndexer',
                        'src/adaptions/crystfel/SimpleDiffractionPatternPrediction.cpp',
                        'src/adaptions/crystfel/SimpleProjection.cpp'],
                       include_directories: [incdir],
-                      dependencies: [eigendep],
+                      dependencies: [eigendep, pthreaddep],
                       install: true,
                       override_options : ['cpp_std=c++11'])