--- a/src/3rdParty/salomesmesh/CMakeLists.txt	2018-04-06 10:48:37.000000000 +0200
+++ a/src/3rdParty/salomesmesh/CMakeLists.txt	2018-04-06 10:48:37.000000000 +0200
@@ -85,6 +85,7 @@
 else(MSVC)
     if(BUILD_FEM_NETGEN)
         set(SMESH_LIBS
+            pthread
             ${NGLIB_LIBRARIES}
             ${OCC_LIBRARIES}
             ${OCC_OCAF_LIBRARIES}
@@ -92,6 +93,7 @@
         ADD_DEFINITIONS(${NETGEN_DEFINITIONS})
     else(BUILD_FEM_NETGEN)
         set(SMESH_LIBS
+            pthread
             ${OCC_LIBRARIES}
             ${OCC_OCAF_LIBRARIES}
         )