optional occt

contrib/mobile/utils/android_build.sh

 #!/usr/bin/env bash
 
 appname=Onelab
+enable_occt=1
 if [ $# -eq 1 ] ; then
   appname=${1}
   echo "Rebranding Onelab app as ${appname}"
+  enable_occt=0
 fi
 
 gmsh_git="${HOME}/src/gmsh"
@@ -42,7 +44,7 @@ if [ ! -d "$gmsh_git/build_android" ] || [ ! -f "$gmsh_git/build_android/CMakeCa
   mkdir $gmsh_git/build_android
 fi
 cd $gmsh_git/build_android
-cmake $cmake_default -DENABLE_BLAS_LAPACK=1 -DENABLE_BUILD_SHARED=1 -DENABLE_MATHEX=1 -DENABLE_MESH=1 -DENABLE_ONELAB=1 -DENABLE_PARSER=1 -DENABLE_POST=1 -DENABLE_PLUGINS=1 -DENABLE_ANN=1 -DENABLE_TETGEN=1 -DENABLE_KBIPACK=1 -DENABLE_GMP=0 -DENABLE_ZIPPER=1 -DBLAS_LAPACK_LIBRARIES="$petsc_lib/libf2cblas.so;$petsc_lib/libf2clapack.so" -DENABLE_OCC=1 -DOCC_LIBS="${occ_lib}/libTKSTEP.a;${occ_lib}/libTKSTEP209.a;${occ_lib}/libTKSTEPAttr.a;${occ_lib}/libTKSTEPBase.a;${occ_lib}/libTKIGES.a;${occ_lib}/libTKXSBase.a;${occ_lib}/libTKOffset.a;${occ_lib}/libTKFeat.a;${occ_lib}/libTKFillet.a;${occ_lib}/libTKBool.a;${occ_lib}/libTKShHealing.a;${occ_lib}/libTKMesh.a;${occ_lib}/libTKHLR.a;${occ_lib}/libTKBO.a;${occ_lib}/libTKPrim.a;${occ_lib}/libTKTopAlgo.a;${occ_lib}/libTKGeomAlgo.a;${occ_lib}/libTKBRep.a;${occ_lib}/libTKGeomBase.a;${occ_lib}/libTKG3d.a;${occ_lib}/libTKG2d.a;${occ_lib}/libTKMath.a;${occ_lib}/libTKernel.a" -DOCC_INC=${occ_inc} ..
+cmake $cmake_default -DENABLE_BLAS_LAPACK=1 -DENABLE_BUILD_SHARED=1 -DENABLE_MATHEX=1 -DENABLE_MESH=1 -DENABLE_ONELAB=1 -DENABLE_PARSER=1 -DENABLE_POST=1 -DENABLE_PLUGINS=1 -DENABLE_ANN=1 -DENABLE_TETGEN=1 -DENABLE_KBIPACK=1 -DENABLE_GMP=0 -DENABLE_ZIPPER=1 -DBLAS_LAPACK_LIBRARIES="$petsc_lib/libf2cblas.so;$petsc_lib/libf2clapack.so" -DENABLE_OCC=$enable_occt -DOCC_LIBS="${occ_lib}/libTKSTEP.a;${occ_lib}/libTKSTEP209.a;${occ_lib}/libTKSTEPAttr.a;${occ_lib}/libTKSTEPBase.a;${occ_lib}/libTKIGES.a;${occ_lib}/libTKXSBase.a;${occ_lib}/libTKOffset.a;${occ_lib}/libTKFeat.a;${occ_lib}/libTKFillet.a;${occ_lib}/libTKBool.a;${occ_lib}/libTKShHealing.a;${occ_lib}/libTKMesh.a;${occ_lib}/libTKHLR.a;${occ_lib}/libTKBO.a;${occ_lib}/libTKPrim.a;${occ_lib}/libTKTopAlgo.a;${occ_lib}/libTKGeomAlgo.a;${occ_lib}/libTKBRep.a;${occ_lib}/libTKGeomBase.a;${occ_lib}/libTKG3d.a;${occ_lib}/libTKG2d.a;${occ_lib}/libTKMath.a;${occ_lib}/libTKernel.a" -DOCC_INC=${occ_inc} ..
 check
 make androidGmsh -j$cmake_thread
 check

contrib/mobile/utils/iossimulator_build.sh

 #/usr/bin/env bash
 
 appname=Onelab
+enable_occt=1
 if [ $# -eq 1 ] ; then
   appname=${1}
   echo "Rebranding Onelab app as ${appname}"
+  enable_occt=0
 fi
 
 gmsh_git="${HOME}/src/gmsh/"
@@ -40,7 +42,7 @@ function check {
 cd $gmsh_git && git pull
 mkdir -p $gmsh_git/build_iossimulator
 cd $gmsh_git/build_iossimulator
-cmake $cmake_default -DENABLE_BLAS_LAPACK=1 -DENABLE_BUILD_LIB=1 -DENABLE_MATHEX=1 -DENABLE_MESH=1 -DENABLE_ONELAB=1 -DENABLE_PARSER=1 -DENABLE_POST=1 -DENABLE_PLUGINS=1 -DENABLE_ANN=1 -DENABLE_TETGEN=1 -DENABLE_KBIPACK=1 -DENABLE_GMP=0 -DENABLE_ZIPPER=1 -DENABLE_OCC=1 -DOCC_LIBS="$occt_framework/OCCT" -DOCC_INC="$occt_framework/Headers/" ..
+cmake $cmake_default -DENABLE_BLAS_LAPACK=1 -DENABLE_BUILD_LIB=1 -DENABLE_MATHEX=1 -DENABLE_MESH=1 -DENABLE_ONELAB=1 -DENABLE_PARSER=1 -DENABLE_POST=1 -DENABLE_PLUGINS=1 -DENABLE_ANN=1 -DENABLE_TETGEN=1 -DENABLE_KBIPACK=1 -DENABLE_GMP=0 -DENABLE_ZIPPER=1 -DENABLE_OCC=$enable_occt -DOCC_LIBS="$occt_framework/OCCT" -DOCC_INC="$occt_framework/Headers/" ..
 check
 $build_cmd OTHER_CFLAGS="-mios-simulator-version-min=8.0" OTHER_CPLUSPLUSFLAGS="-mios-simulator-version-min=8.0 -std=c++11"
 check