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diff -rupN gmsh-2.9.0-source/CMakeLists.txt gmsh-2.9.0-source-new/CMakeLists.txt
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--- gmsh-2.9.0-source/CMakeLists.txt	2015-03-12 12:14:16.000000000 +0100
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+++ gmsh-2.9.0-source-new/CMakeLists.txt	2015-03-13 23:52:54.804192621 +0100
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@@ -160,8 +160,7 @@ set(GMSH_API
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   contrib/MeshOptimizer/MeshOptObjectiveFunction.h contrib/MeshOptimizer/MeshOptVertexCoord.h 
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   contrib/MeshQualityOptimizer/MeshQualityObjContribIdealJac.h
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   contrib/MeshQualityOptimizer/MeshQualityObjContribInvCond.h
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-  contrib/MeshQualityOptimizer/MeshQualityOptimizer.h
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-  contrib/MathEx/mathex.h)
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+  contrib/MeshQualityOptimizer/MeshQualityOptimizer.h)
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 get_property(IAMCHILD DIRECTORY  PROPERTY PARENT_DIRECTORY)
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 if(IAMCHILD)
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@@ -645,7 +644,7 @@ endif(HAVE_FLTK OR HAVE_QT OR ENABLE_GRA
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 if(HAVE_MESH OR HAVE_PLUGINS)
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   if(ENABLE_ANN)
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-    find_library(ANN_LIB ann PATH_SUFFIXES lib)
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+    find_library(ANN_LIB ANN PATH_SUFFIXES lib)
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     find_path(ANN_INC "ANN.h" PATH_SUFFIXES src include ANN)
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     if(ANN_LIB AND ANN_INC)
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       list(APPEND EXTERNAL_LIBRARIES ${ANN_LIB})
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@@ -660,8 +659,16 @@ if(HAVE_MESH OR HAVE_PLUGINS)
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 endif(HAVE_MESH OR HAVE_PLUGINS)
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 if(ENABLE_BFGS)
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-  add_subdirectory(contrib/lbfgs)
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-  include_directories(contrib/lbfgs)
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+  find_library(BFGS_LIB lbfgs PATH_SUFFIXES lib)
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+  find_path(BFGS_INC "lbfgs.h" PATH_SUFFIXES include)
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+  if(BFGS_LIB AND BFGS_INC)
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+    list(APPEND EXTERNAL_LIBRARIES ${BFGS_LIB} -lalglib)
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+    list(APPEND EXTERNAL_INCLUDES ${BFGS_INC})
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+  else(BFGS_LIB AND BFGS_INC)
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+    message(STATUS "System libbfgs not found: using contrib/lbfgs instead")
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+    add_subdirectory(contrib/lbfgs)
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+    include_directories(contrib/lbfgs)
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+  endif(BFGS_LIB AND BFGS_INC)
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   set_config_option(HAVE_BFGS "Bfgs")
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 endif(ENABLE_BFGS)
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@@ -707,8 +714,16 @@ if(ENABLE_KBIPACK)
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 endif(ENABLE_KBIPACK)
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 if(ENABLE_MATHEX)
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-  add_subdirectory(contrib/MathEx)
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-  include_directories(contrib/MathEx)
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+  find_library(MATHEX_LIB mathex PATH_SUFFIXES lib)
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+  find_path(MATHEX_INC "mathex.h" PATH_SUFFIXES src include)
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+  if(MATHEX_LIB AND MATHEX_INC)
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+     list(APPEND EXTERNAL_LIBRARIES ${MATHEX_LIB})
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+     list(APPEND EXTERNAL_INCLUDES ${MATHEX_INC})
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+  else(MATHEX_LIB AND MATHEX_INC)
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+     message(STATUS "System MATHEX not found: using contrib/MathEx instead")
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+    add_subdirectory(contrib/MathEx)
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+    include_directories(contrib/MathEx)
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+  endif(MATHEX_LIB AND MATHEX_INC)
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   set_config_option(HAVE_MATHEX "MathEx")
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 endif(ENABLE_MATHEX)
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@@ -739,13 +754,17 @@ endif(ENABLE_POPPLER)
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 if(HAVE_MESH OR HAVE_SOLVER)
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   if(ENABLE_METIS)
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-    # Gmsh currently uses Metis 4 - we should switch to Metis 5 and use the
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-    # system lib if available
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-    add_subdirectory(contrib/Metis)
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-    include_directories(contrib/Metis)
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+    find_library(METIS_LIB metis PATH_SUFFIXES lib)
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+    find_path(METIS_INC "metis.h" PATH_SUFFIXES include)
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+    if(METIS_LIB AND METIS_INC)
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+      list(APPEND EXTERNAL_LIBRARIES ${METIS_LIB})
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+      list(APPEND EXTERNAL_INCLUDES ${METIS_INC})
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+    else(METIS_LIB AND METIS_INC)
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+      message(STATUS "System metis not found: using contrib/Metis instead")
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+      add_subdirectory(contrib/Metis)
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+      include_directories(contrib/Metis)
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+    endif(METIS_LIB AND METIS_INC)
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     set_config_option(HAVE_METIS "Metis")
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-    message(STATUS "Note: By including Metis you have to comply with Metis' "
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-            "special licensing requirements stated in contrib/Metis/README.txt.")
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   endif(ENABLE_METIS)
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   if(ENABLE_CHACO)
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@@ -757,8 +776,16 @@ endif(HAVE_MESH OR HAVE_SOLVER)
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 if(HAVE_MESH)
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   if(ENABLE_VORO3D)
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-    add_subdirectory(contrib/voro++)
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-    include_directories(contrib/voro++/src)
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+    find_library(VORO3D_LIB voro++ PATH_SUFFIXES lib)
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+    find_path(VORO3D_INC "voro++.hh" PATH_SUFFIXES include/voro++)
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+    if(VORO3D_LIB AND VORO3D_INC)
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+      list(APPEND EXTERNAL_LIBRARIES ${VORO3D_LIB})
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+      list(APPEND EXTERNAL_INCLUDES ${VORO3D_INC})
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+    else(VORO3D_LIB AND VORO3D_INC)
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+      message(STATUS "System voro++ not found: using contrib/voro++ instead")
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+      add_subdirectory(contrib/voro++)
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+      include_directories(contrib/voro++)
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+    endif(VORO3D_LIB AND VORO3D_INC)
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     set_config_option(HAVE_VORO3D "Voro3D")
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   endif(ENABLE_VORO3D)
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@@ -770,9 +797,22 @@ if(HAVE_MESH)
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   endif(ENABLE_BLOSSOM)
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   if(ENABLE_NETGEN)
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-    add_subdirectory(contrib/Netgen)
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-    include_directories(contrib/Netgen contrib/Netgen/libsrc/include 
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-                        contrib/Netgen/nglib)
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+    find_library(NETGEN_LIB nglib PATH_SUFFIXES lib)
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+    find_path(NETGEN_INC "nglib.h" PATH_SUFFIXES include/netgen-mesher)
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+    if(NETGEN_LIB AND NETGEN_INC)
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+      list(APPEND EXTERNAL_LIBRARIES ${NETGEN_LIB})
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+      list(APPEND EXTERNAL_INCLUDES ${NETGEN_INC})
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+      # Netgen private headers contain what contrib/Salome does
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+      list(APPEND EXTERNAL_LIBRARIES -lngocc -lngcsg -lngmesh)
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+      list(APPEND EXTERNAL_INCLUDES ${NETGEN_INC}/private ${NETGEN_INC} ${NETGEN_INC}/private/include)
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+      add_definitions(-DOCCGEOMETRY)
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+      set_config_option(HAVE_SALOME "Salome")
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+    else(NETGEN_LIB AND NETGEN_INC)
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+      message(STATUS "System netgen not found: using contrib/Netgen instead")
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+      add_subdirectory(contrib/Netgen)
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+      include_directories(contrib/Netgen contrib/Netgen/libsrc/include 
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+                          contrib/Netgen/nglib)
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+    endif(NETGEN_LIB AND NETGEN_INC)
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     set_config_option(HAVE_NETGEN "Netgen")
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     add_definitions(-DNO_PARALLEL_THREADS -DNOTCL)
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   endif(ENABLE_NETGEN)
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@@ -784,8 +824,8 @@ if(HAVE_MESH)
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   endif(ENABLE_BAMG)
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   if(ENABLE_MMG3D)
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-    find_library(MMG3D_LIB mmg3dlib4.0 PATH_SUFFIXES lib)
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-    find_path(MMG3D_INC "libmmg3d.h" PATH_SUFFIXES src include)
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+    find_library(MMG3D_LIB mmg3d4 PATH_SUFFIXES lib)
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+    find_path(MMG3D_INC "libmmg3d4.h" PATH_SUFFIXES src include)
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     if(MMG3D_LIB AND MMG3D_INC)
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        list(APPEND EXTERNAL_LIBRARIES ${MMG3D_LIB})
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        list(APPEND EXTERNAL_INCLUDES ${MMG3D_INC})
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@@ -1127,19 +1167,6 @@ if(ENABLE_OCC)
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       endif(NOT OCC_CONFIG_H)
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     endif(OCC_INC)
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   endif(NUM_OCC_LIBS EQUAL NUM_OCC_LIBS_REQUIRED)
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-  if(HAVE_OCC)
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-    if(ENABLE_SGEOM)
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-      add_subdirectory(contrib/SGEOM)
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-      include_directories(contrib/SGEOM)
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-      add_definitions(-DSGEOMGEOMETRY)
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-      set_config_option(HAVE_SGEOM "SGEOM")
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-    elseif(ENABLE_SALOME)
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-      add_subdirectory(contrib/Salome)
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-      include_directories(contrib/Salome)
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-      add_definitions(-DOCCGEOMETRY)
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-      set_config_option(HAVE_SALOME "Salome")
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-    endif(ENABLE_SGEOM)
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-  endif(HAVE_OCC)
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 endif(ENABLE_OCC)
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 if(ENABLE_ACIS)
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diff -rupN gmsh-2.9.0-source/Geo/GModelFactory.cpp gmsh-2.9.0-source-new/Geo/GModelFactory.cpp
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--- gmsh-2.9.0-source/Geo/GModelFactory.cpp	2015-03-08 14:03:26.000000000 +0100
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+++ gmsh-2.9.0-source-new/Geo/GModelFactory.cpp	2015-03-13 23:52:22.325508412 +0100
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@@ -496,7 +496,7 @@ void GeoFactory::healGeometry(GModel *gm
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 #include <GeomAPI_PointsToBSpline.hxx>
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 #include "OCC_Connect.h"
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 #if defined(HAVE_SALOME)
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-#include "Partition_Spliter.hxx"
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+#include <occ/Partition_Spliter.hxx>
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 #endif
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 GVertex *OCCFactory::addVertex(GModel *gm, double x, double y, double z, double lc)
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diff -rupN gmsh-2.9.0-source/Geo/GModelIO_OCC.cpp gmsh-2.9.0-source-new/Geo/GModelIO_OCC.cpp
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--- gmsh-2.9.0-source/Geo/GModelIO_OCC.cpp	2015-03-08 14:03:26.000000000 +0100
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+++ gmsh-2.9.0-source-new/Geo/GModelIO_OCC.cpp	2015-03-13 23:52:22.326508433 +0100
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@@ -19,7 +19,7 @@
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 #if defined(HAVE_OCC)
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 #if defined(HAVE_SALOME)
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-#include "Partition_Spliter.hxx"
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+#include <occ/Partition_Spliter.hxx>
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 #endif
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 void addSimpleShapes(TopoDS_Shape theShape, TopTools_ListOfShape &theList);
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diff -rupN gmsh-2.9.0-source/Mesh/CMakeLists.txt gmsh-2.9.0-source-new/Mesh/CMakeLists.txt
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--- gmsh-2.9.0-source/Mesh/CMakeLists.txt	2015-03-08 14:03:14.000000000 +0100
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+++ gmsh-2.9.0-source-new/Mesh/CMakeLists.txt	2015-03-13 23:52:22.327508454 +0100
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@@ -39,6 +39,7 @@ set(SRC
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     Field.cpp
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     CenterlineField.cpp
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     surfaceFiller.cpp
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+    nglib_gmsh.cpp
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 )
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 file(GLOB HDR RELATIVE ${CMAKE_CURRENT_SOURCE_DIR} *.h) 
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diff -rupN gmsh-2.9.0-source/Mesh/meshGRegionMMG3D.cpp gmsh-2.9.0-source-new/Mesh/meshGRegionMMG3D.cpp
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--- gmsh-2.9.0-source/Mesh/meshGRegionMMG3D.cpp	2015-03-08 14:03:14.000000000 +0100
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+++ gmsh-2.9.0-source-new/Mesh/meshGRegionMMG3D.cpp	2015-03-13 23:52:22.327508454 +0100
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@@ -19,7 +19,7 @@
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 #include "Context.h"
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 extern "C" {
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-#include <libmmg3d.h>
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+#include <libmmg3d4.h>
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 #define M_UNUSED    (1 << 0)
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 }
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